6br-28199-23 (1)

Read this manual carefully before operating thisoutboard motor.

OWNER’S MANUAL

F250BFL250B

6BR-28199-23-E0

U6BR23E0.book Friday, March 26, 2010 9:18 AM

Read this manual carefully before operating this outboard motor. Keep thismanual onboard in a waterproof bag when boating. This manual should staywith the outboard motor if it is sold.

U6BR23E0.book Page 1 Friday, March 26, 2010 9:18 AM

Important manual informationEMU25107

To the ownerThank you for selecting a Yamaha outboardmotor. This Owner’s Manual contains infor-mation needed for proper operation, mainte-nance and care. A thorough understanding ofthese simple instructions will help you obtainmaximum enjoyment from your new Yamaha.If you have any question about the operationor maintenance of your outboard motor,please consult a Yamaha dealer.In this Owner’s Manual particularly importantinformation is distinguished in the followingways.

: This is the safety alert symbol. It is usedto alert you to potential personal injury haz-ards. Obey all safety messages that followthis symbol to avoid possible injury or death.

WARNINGEWM00781

A WARNING indicates a hazardous situa-tion which, if not avoided, could result indeath or serious injury.

NOTICEECM00701

A NOTICE indicates special precautionsthat must be taken to avoid damage to theoutboard motor or other property.

TIP:A TIP provides key information to make pro-cedures easier or clearer.

Yamaha continually seeks advancements inproduct design and quality. Therefore, whilethis manual contains the most current productinformation available at the time of printing,there may be minor discrepancies between

your machine and this manual. If there is anyquestion concerning this manual, please con-sult your Yamaha dealer.To ensure long product life, Yamaha recom-mends that you use the product and performthe specified periodic inspections and mainte-nance by correctly following the instructions inthe owner’s manual. Any damage resultingfrom neglect of these instructions is not cov-ered by warranty.Some countries have laws or regulations re-stricting users from taking the product out ofthe country where it was purchased, and itmay be impossible to register the product inthe destination country. Additionally, the war-ranty may not apply in certain regions. Whenplanning to take the product to another coun-try, consult the dealer where the product waspurchased for further information.If the product was purchased used, pleaseconsult your closest dealer for customer re-registration, and to be eligible for the specifiedservices.

TIP:The F250BET, FL250BET and the standardaccessories are used as a base for the expla-nations and illustrations in this manual. There-fore some items may not apply to everymodel.EMU25121

F250B, FL250BOWNER’S MANUAL

©2010 by Yamaha Motor Co., Ltd.1st Edition, March 2010

All rights reserved.Any reprinting or unauthorized usewithout the written permission of

Yamaha Motor Co., Ltd.is expressly prohibited.

Printed in Japan


Table of contents

Safety information.............................1Outboard motor safety .................... 1

Propeller ............................................. 1Rotating parts ..................................... 1Hot parts............................................. 1Electric shock ..................................... 1Power trim and tilt............................... 1Engine shut-off cord (lanyard) ............ 1Gasoline ............................................. 1Gasoline exposure and spills ............. 1Carbon monoxide ............................... 2Modifications ...................................... 2

Boating safety ................................. 2Alcohol and drugs............................... 2Personal flotation devices .................. 2People in the water............................. 2Passengers ........................................ 2Overloading ........................................ 2Avoid collisions................................... 2Weather.............................................. 3Passenger training ............................. 3Boating safety publications................. 3Laws and regulations ......................... 3

General information ..........................4Identification numbers record.......... 4

Outboard motor serial number ........... 4Digital electronic control serial

number............................................ 4Key number ........................................ 5

C-Tick label ..................................... 5Read manuals and labels................ 6

Warning labels.................................... 6Specifications and requirements.....9

Specifications .................................. 9Installation requirements ............... 10

Boat horsepower rating .................... 10Mounting motor ................................ 10

Digital electronic control requirements .............................. 10

Battery requirements..................... 11Battery specifications ....................... 11Mounting battery............................... 11Multiple batteries .............................. 11

Propeller selection ........................ 11Counter rotation models ................... 12

Start-in-gear protection ................. 12Engine oil requirements ................ 12Fuel requirements ......................... 13

Gasoline ........................................... 13Muddy or acidic water ................... 13Anti-fouling paint ........................... 13Motor disposal requirements......... 13Emergency equipment .................. 13Emission control information......... 14

U.S. insular areas............................. 14Components .................................... 15

Components diagram.................... 15Digital electronic control ................... 17Digital electronic control-active

indicator ........................................ 18Digital electronic control-alert

indicator ........................................ 19Control lever ..................................... 20Neutral interlock trigger .................... 20Free throttle switch ........................... 21Throttle friction adjuster .................... 22Engine selector switch...................... 23Engine shut-off cord (lanyard) and

clip................................................. 23Main switch....................................... 24Power trim and tilt switch on digital

electronic control ........................... 25Power trim and tilt switch on bottom

cowling .......................................... 26Power trim and tilt switches.............. 26Trim tab with anode.......................... 27Tilt support lever for power trim and

tilt model........................................ 28Cowling lock lever (pull up type)....... 28Flushing device ................................ 28Fuel filter/Water separator ................ 29

Instruments and indicators............ 306Y8 Multifunction meters .............. 306Y8 Multifunction tachometers...... 30

Start-up checks ................................ 30Adjusting trolling speed .................... 31Low oil pressure-alert ....................... 31


Table of contents

Overheat alert................................... 31Water separator alert........................ 32Engine trouble alert .......................... 32Low battery voltage-alert .................. 32

6Y8 Multifunction speed & fuel meters ........................................ 32

6Y8 Multifunction speedometers... 336Y8 Multifunction fuel

management meters .................. 34Engine control system.................... 35

Alert system .................................. 35Digital Electronic Control alert .......... 35Overheat alert................................... 35Low oil pressure alert ....................... 36

Installation .......................................38Installation ..................................... 38

Mounting the outboard motor ........... 38Operation ......................................... 40

First-time operation ....................... 40Fill engine oil .................................... 40Breaking in engine............................ 40Getting to know your boat ................ 40

Checks before starting engine ...... 40Fuel level .......................................... 40Remove cowling ............................... 41Fuel system...................................... 41Controls ............................................ 41Engine shut-off cord (lanyard) .......... 42Engine oil.......................................... 42Engine .............................................. 43Flushing device ................................ 43Install cowling ................................... 43Checking power trim and tilt

system........................................... 44Battery .............................................. 45

Filling fuel ...................................... 45Operating engine........................... 46

Sending fuel ..................................... 46Starting engine ................................. 46

Checks after starting engine ......... 49Cooling water ................................... 49

Warming up engine ....................... 49Electric start models ......................... 49

Checks after engine warm up ....... 49Shifting ............................................. 49Stop switches ................................... 49

Selecting outboard motor (triple engine)............................. 49

Shifting .......................................... 51Stopping boat................................ 53Operating the port / center /

starboard engine........................ 53Boat direction ................................ 56Stopping engine............................ 58

Procedure for stopping engine ......... 58Trimming outboard motor.............. 59

Adjusting trim angle (Power trim and tilt) ....................... 59

Adjusting boat trim............................ 60Tilting up and down....................... 61

Procedure for tilting up (power trim and tilt models)........... 62

Procedure for tilting down (power trim and tilt models)........... 64

Shallow water................................ 64Power trim and tilt models ................ 64

Cruising in other conditions........... 66Maintenance .................................... 67

Transporting and storing outboard motor.......................................... 67Storing outboard motor..................... 67Procedure......................................... 68Lubrication........................................ 68Flushing power unit .......................... 69Checking painted surface of

outboard motor.............................. 69Periodic maintenance ................... 70

Replacement parts ........................... 70Severe operating conditions............. 70Maintenance chart 1......................... 71Maintenance chart 2......................... 73Greasing........................................... 74Cleaning and adjusting spark plug ... 75Inspecting idling speed..................... 76Changing engine oil.......................... 76Inspecting wiring and connectors ..... 78


Table of contents

Checking propeller ........................... 78Removing propeller .......................... 79Installing propeller ............................ 79Changing gear oil ............................. 80Inspecting and replacing anode(s) ... 82Checking battery

(for electric start models) .............. 82Connecting the battery ..................... 83Disconnecting the battery................. 85

Trouble Recovery............................ 86Troubleshooting ............................ 86Temporary action in emergency.... 89

Impact damage................................. 89Running in an emergency

(twin engines or triple engines) ..... 89Replacing fuse.................................. 89Power trim and tilt will not operate ... 90Water separator-alert indicator

blinks while cruising ...................... 90Treatment of submerged motor..... 92


1

Safety informationEMU33622

Outboard motor safetyObserve these precautions at all times.EMU36501

PropellerPeople can be injured or killed if they come incontact with the propeller. The propeller cankeep moving even when the motor is in neu-tral, and sharp edges of the propeller can cuteven when stationary.� Stop the engine when a person is in the wa-

ter near you.� Keep people out of reach of the propeller,

even when the engine is off.EMU33630

Rotating partsHands, feet, hair, jewelry, clothing, PFDstraps, etc. can become entangled with inter-nal rotating parts of the engine, resulting in se-rious injury or death.Keep the top cowling in place whenever pos-sible. Do not remove or replace the cowlingwith the engine running.Only operate the engine with the cowling re-moved according to the specific instructions inthe manual. Keep hands, feet, hair, jewelry,clothing, PFD straps, etc. away from any ex-posed moving parts.EMU33640

Hot partsDuring and after operation, engine parts arehot enough to cause burns. Avoid touchingany parts under the top cowling until the en-gine has cooled.EMU33650

Electric shockDo not touch any electrical parts while startingor operating the engine. They can causeshock or electrocution.EMU33660

Power trim and tiltBody parts can be crushed between the mo-tor and the clamp bracket when the motor istrimmed or tilted. Keep body parts out of this

area at all times. Be sure no one is in this areabefore operating the power trim and tilt mech-anism.The power trim and tilt switches operate evenwhen the main switch is off. Keep people beaway from the switches whenever workingaround the motor.Never get under the lower unit while it is tilted,even when the tilt support lever is locked. Se-vere injury could occur if the outboard motoraccidentally falls.EMU33671

Engine shut-off cord (lanyard)Attach the engine shut-off cord so that the en-gine stops if the operator falls overboard orleaves the helm. This prevents the boat fromrunning away under power and leaving peo-ple stranded, or running over people or ob-jects.Always attach the engine shut-off cord to asecure place on your clothing or your arm orleg while operating. Do not remove it to leavethe helm while the boat is moving. Do not at-tach the cord to clothing that could tear loose,or route the cord where it could become en-tangled, preventing it from functioning.Do not route the cord where it is likely to beaccidentally pulled out. If the cord is pulledduring operation, the engine will shut off andyou will lose most steering control. The boatcould slow rapidly, throwing people and ob-jects forward.EMU33810

GasolineGasoline and its vapors are highly flam-mable and explosive. Always, refuel accord-ing to the procedure on page 46 to reduce therisk of fire and explosion.EMU33820

Gasoline exposure and spillsTake care not to spill gasoline. If gasolinespills, wipe it up immediately with dry rags.Dispose of rags properly.


Safety information

2

If any gasoline spills onto your skin, immedi-ately wash with soap and water. Changeclothing if gasoline spills on it.If you swallow gasoline, inhale a lot of gaso-line vapor, or get gasoline in your eyes, getimmediate medical attention. Never siphonfuel by mouth.EMU33900

Carbon monoxideThis product emits exhaust gases which con-tain carbon monoxide, a colorless, odorlessgas which may cause brain damage or deathwhen inhaled. Symptoms include nausea,dizziness, and drowsiness. Keep cockpit andcabin areas well ventilated. Avoid blocking ex-haust outlets.EMU33780

ModificationsDo not attempt to modify this outboard motor.Modifications to your outboard motor may re-duce safety and reliability, and render the out-board unsafe or illegal to use.EMU33740

Boating safetyThis section includes a few of the many im-portant safety precautions that you should fol-low when boating.EMU33710

Alcohol and drugsNever operate after drinking alcohol or takingdrugs. Intoxication is one of the most commonfactors contributing to boating fatalities.EMU33720

Personal flotation devicesHave an approved personal flotation device(PFD) on board for every occupant. Yamaharecommends that you must wear a PFDwhenever boating. At a minimum, childrenand non-swimmers should always wearPFDs, and everyone should wear PFDs whenthere are potentially hazardous boating condi-tions.

EMU33731

People in the waterAlways watch carefully for people in the wa-ter, such as swimmers, skiers, or divers,whenever the engine is running. When some-one is in the water near the boat, shift intoneutral and stop the engine.Stay away from swimming areas. Swimmerscan be hard to see.The propeller can keep moving even whenthe motor is in neutral. Stop the engine whena person is in the water near you.EMU33751

PassengersConsult your boat manufacturer’s instructionsfor details about appropriate passenger loca-tions in your boat and be sure all passengersare positioned properly before acceleratingand when operating above an idle speed.Standing or sitting in non-designated loca-tions may result in being thrown either over-board or within the boat due to waves, wakes,or sudden changes in speed or direction.Even when people are positioned properly,alert your passengers if you must make anyunusual maneuver. Always avoid jumpingwaves or wakes.EMU33760

OverloadingDo not overload the boat. Consult the boat ca-pacity plate or boat manufacturer for maxi-mum weight and number of passengers. Besure that weight is properly distributed ac-cording to the boat manufacturers instruc-tions. Overloading or incorrect weightdistribution can compromise the boats han-dling and lead to an accident, capsizing orswamping.EMU33772

Avoid collisionsScan constantly for people, objects, and otherboats. Be alert for conditions that limit yourvisibility or block your vision of others.


Safety information

3

Operate defensively at safe speeds and keepa safe distance away from people, objects,and other boats.� Do not follow directly behind other boats or

waterskiers.� Avoid sharp turns or other maneuvers that

make it hard for others to avoid you or un-derstand where you are going.

� Avoid areas with submerged objects orshallow water.

� Ride within your limits and avoid aggressivemaneuvers to reduce the risk of loss of con-trol, ejection, and collision.

� Take early action to avoid collisions. Re-member, boats do not have brakes, andstopping the engine or reducing throttle canreduce the ability to steer. If you are notsure that you can stop in time before hittingan obstacle, apply throttle and turn in anoth-er direction.

EMU33790

WeatherStay informed about the weather. Checkweather forecasts before boating. Avoid boat-ing in hazardous weather.EMU33880

Passenger trainingMake sure at least one other passenger istrained to operate the boat in the event of anemergency.

EMU33890

Boating safety publicationsBe informed about boating safety. Additionalpublications and information can be obtainedfrom many boating organizations.EMU33600

Laws and regulationsKnow the marine laws and regulations whereyou will be boating- and obey them. Severalsets of rules prevail according to geographiclocation, but all are basically the same as theInternational Rules of the Road.

ZMU06025


General information

4

EMU25171

Identification numbers recordEMU25183

Outboard motor serial numberThe outboard motor serial number is stampedon the label attached to the port side of theclamp bracket.Record your outboard motor serial number inthe spaces provided to assist you in orderingspare parts from your Yamaha dealer or forreference in case your outboard motor is sto-len.

EMU34943

Digital electronic control serial num-berThe digital electronic control serial number isstamped on the label attached to the digitalelectronic control box.Record your digital electronic control serialnumber in the spaces provided to assist youin newly connecting the digital electronic con-trol to the outboard motor.

TIP:Consult your Yamaha dealer if you have anyquestions concerning the digital electroniccontrol serial number.

1. Outboard motor serial number location

1. Digital electronic control serial number loca-tion



ZMU06224

1

ZMU05885

1

ZMU05887

1


General information

5

EMU25191

Key numberIf a main key switch is equipped with the mo-tor, the key identification number is stampedon your key as shown in the illustration.Record this number in the space provided forreference in case you need a new key.

EMU25213

C-Tick labelEngines affixed with this label conform to cer-tain portion(s) of the Australian Radio Com-munications Act.


ZMU05958

1

1. Key number

1. C-Tick label location

ZMU01697


General information

6

EMU33522

Read manuals and labelsBefore operating or working on this outboard motor:� Read this manual.� Read any manuals supplied with the boat.� Read all labels on the outboard motor and the boat.If you need any additional information, contact your Yamaha dealer.EMU33832

Warning labels If these labels are damaged or missing, contact your Yamaha dealer for replacements.F250B, FL250B


General information

7

EMU34651

Contents of labelsThe above warning labels mean as follows.1

WARNINGEWM01681

� Keep hands, hair, and clothing awayfrom rotating parts while the engine isrunning.

� Do not touch or remove electrical partswhen starting or during operation.

2

WARNINGEWM01671

� Read Owner’s Manuals and labels.� Wear an approved personal flotation de-

vice (PFD).

� Attach engine shut-off cord (lanyard) toyour PFD, arm, or leg so the enginestops if you accidentally leave the helm,which could prevent a runaway boat.

EMU33850

Other labels

1 2

ZMU06191

3

ZMU05710


General information

8

EMU35132

SymbolsThe following symbols mean as follows.

Notice/Warning

Read Owner’s Manual

Hazard caused by continuous rotation

Electrical hazard

ZMU05696

ZMU05664

ZMU05665

ZMU05666


Specifications and requirements

9

EMU34520

SpecificationsTIP:“(AL)” stated in the specification data belowrepresents the numerical value for the alumi-num propeller installed.Likewise, “(SUS)” represents the value forstainless steel propeller installed and “(PL)”for plastic propeller installed.

TIP:“*” means, select the engine oil referring to thechart of engine oil paragraph. For further infor-mation, see page 12.EMU2821J

Dimension:Overall length:

868 mm (34.2 in)Overall width:

634 mm (25.0 in)Overall height X:

1829 mm (72.0 in)Overall height U:

1956 mm (77.0 in)Transom height X:

643 mm (25.3 in)Transom height U:

770 mm (30.3 in)Weight (SUS) X:

F250BET 276.0 kg (608 lb)FL250BET 280.0 kg (617 lb)

Weight (SUS) U:286.0 kg (631 lb)

Performance:Full throttle operating range:

5000–6000 r/minMaximum output:

183.9 kW@5500 r/min (250 HP@5500 r/min)

Idle speed (in neutral):650 ±50 r/min

Engine:Type:

4-stroke VDisplacement:

3352.0 cm³Bore × stroke:

94.0 × 80.5 mm (3.70 × 3.17 in)Ignition system:

TCISpark plug (NGK):

LFR6A-11Spark plug gap:

1.0–1.1 mm (0.039–0.043 in)Control system:

Remote controlStarting system:

Electric starterStarting carburetion system:

Electronic fuel injectionValve clearance (cold engine) IN:

0.17–0.23 mm (0.0067–0.0091 in)Valve clearance (cold engine) EX:

0.31–0.37 mm (0.0122–0.0146 in)Min. cold cranking amps (CCA/EN):

711.0 AMin. rated capacity (20HR/IEC):

100.0 AhMaximum generator output:

44 ADrive unit:

Gear positions:Forward-neutral-reverse

Gear ratio:2.00(30/15)

Trim and tilt system:Power trim and tilt

Propeller mark:F250BET T / MFL250BET TL / ML



10

Fuel and oil:Recommended fuel:

Premium unleaded gasolineMin. research octane:

94Recommended engine oil:

4-stroke outboard motor oilRecommended engine oil group 1*:

SAE 10W-30/10W-40/5W-30 API SE/SF/SG/SH/SJ/SL

Recommended engine oil group 2*:SAE 15W-40/20W-40/20W-50 API SH/SJ/SL

Total engine oil quantity (oil pan capacity):5.6 L (5.92 US qt, 4.93 Imp.qt)

Lubrication:Wet sump

Recommended gear oil:Hypoid gear oil SAE#90

Gear oil quantity:F250BET 0.918 L (0.970 US qt, 0.808 Imp.qt)FL250BET 0.803 L (0.849 US qt, 0.707 Imp.qt)

Tightening torque for engine:Spark plug:

25.0 Nm (2.55 kgf-m, 18.4 ft-lb)Propeller nut:

55.0 Nm (5.61 kgf-m, 40.6 ft-lb)Engine oil drain bolt:

28.0 Nm (2.86 kgf-m, 20.7 ft-lb)Engine oil filter:

18.0 Nm (1.84 kgf-m, 13.3 ft-lb)EMU33554

Installation requirementsEMU33564

Boat horsepower rating

WARNINGEWM01560

Overpowering a boat can cause severe in-stability.

Before installing the outboard motor(s), con-firm that the total horsepower of your out-board motor(s) does not exceed the boatsmaximum horsepower rating. See the boat’scapacity plate or contact the manufacturer.EMU33571

Mounting motor

WARNINGEWM01570

� Improper mounting of the outboard mo-tor could result in hazardous conditionssuch as poor handling, loss of control,or fire hazards.

� Because the motor is very heavy, spe-cial equipment and training is requiredto mount it safely.

Your dealer or other person experienced inproper rigging should mount the motor usingcorrect equipment and complete rigging in-structions. For further information, see page38.EMU34952

Digital electronic control re-quirements

The digital electronic control be equipped witha start-in-gear protection device(s). This de-vice prevents the engine from starting unlessit is in neutral.

WARNINGEWM01580

� If the engine starts in gear, the boat canmove suddenly and unexpectedly, pos-sibly causing a collision or throwingpassengers overboard.

� If the engine ever starts in gear, thestart-in-gear protection device is notworking correctly and you should dis-continue using the outboard. Contactyour Yamaha dealer.



11

This digital electronic control unit is only avail-able for the outboard motor which you havepurchased.Prior to use of the digital electronic controlunit, set it in order to operate your outboardmotor only. Otherwise, it will not be possible tooperate the outboard motor.Perform setting of the outboard motor and thedigital electronic control unit in the followingcases.� If a used outboard motor is installed� If the digital electronic control unit is re-

placed� If the ECM (Electronic control module) of

the used outboard motor is replaced� If the ECM (Electronic control module) of

the digital electronic control unit is replacedConsult your Yamaha dealer for setting.EMU25694

Battery requirementsEMU25721

Battery specifications

The engine cannot be started if battery volt-age is too low.EMU36290

Mounting batteryMount the battery holder securely in a dry,well-ventilated, vibration-free location in theboat. WARNING! Do not put flammableitems, or loose heavy or metal objects inthe same compartment as the battery.Fire, explosion or sparks could result.[EWM01820]

EMU36300

Multiple batteriesTo connect multiple batteries, such as for mul-tiple engine configurations or for an accessorybattery, consult your Yamaha dealer aboutbattery selection and correct wiring.EMU34194

Propeller selectionNext to selecting an outboard motor, selectingthe right propeller is one of the most importantpurchasing decisions a boater can make. Thetype, size, and design of your propeller havea direct impact on acceleration, top speed,fuel economy, and even engine life. Yamahadesigns and manufactures propellers for ev-ery Yamaha outboard motor and every appli-cation.Your outboard motor came with a Yamahapropeller selected to perform well over arange of applications, but there may be useswhere a different propeller would be more ap-propriate.Your Yamaha dealer can help you select theright propeller for your boating needs. Selecta propeller that will allow the engine to reachthe middle or upper half of the operatingrange at full throttle with the maximum boat-load. Generally, select a larger pitch propellerfor a smaller operating load and a smallerpitch propeller for a heavier load. If you carryloads that vary widely, select the propeller thatlets the engine run in the proper range for yourmaximum load but remember that you mayneed to reduce your throttle setting to staywithin the recommended engine speed rangewhen carrying lighter loads.To check the propeller, see page 78.

Minimum cold cranking amps (CCA/EN):711.0 A

Minimum rated capacity (20HR/IEC):100.0 Ah



12

EMU36310

Counter rotation modelsStandard outboard motors rotate clockwise.Counter rotation models rotate counterclock-wise. Counter rotation models are typicallyused in multiple motor setups and are markedwith an “L” on the gear case above the anti-ventilation plate.On counter rotation models, be sure to use apropeller intended for counterclockwise rota-tion. These propellers are identified with theletter “L” after the size indication on the pro-peller. WARNING! Never use a standardpropeller with a counter rotation motor, ora counter rotation propeller with a stan-dard motor. Otherwise the boat could goin the direction opposite of that expected(for example, reverse instead of forward),which could lead to an accident. [EWM01810]

For instructions on propeller removal and in-stallation, see page 79 and 79.EMU35140

Start-in-gear protectionYamaha outboard motors or Yamaha-ap-proved digital electronic control units areequipped with start-in-gear protection de-vice(s). This feature permits the engine to bestarted only when it is in neutral. Always se-lect neutral before starting the engine.

EMU37475

Engine oil requirements

If the recommended engine oil grades are notavailable, select an alternative from the fol-lowing chart according to the average temper-atures in your area.

1. Propeller diameter in inches2. Propeller pitch in inches3. Type of propeller (propeller mark)

ZMU04607

-x1 2 3

Recommended engine oil:4-stroke motor oil with a combination of the following SAE and API oil clas-sifications

Engine oil type SAE:10W-30 or 10W-40

Engine oil grade API:SE, SF, SG, SH, SJ, SL

Total engine oil quantity (oil pan capaci-ty):

5.6 L (5.92 US qt, 4.93 Imp.qt)Replacement engine oil quantity (at peri-odic maintenance):

Without oil filter replacement:4.5 L (4.76 US qt, 3.96 Imp.qt)

With oil filter replacement:4.7 L (4.97 US qt, 4.14 Imp.qt)



13

EMU36360

Fuel requirementsEMU36853

GasolineUse a good quality gasoline that meets theminimum octane rating. Yamaha recomendsthat you use alcohol-free (see Gasohol) gas-oline whenever possible.

NOTICEECM01981

� Do not use leaded gasoline. Leaded gas-oline can seriously damage the engine.

� Avoid getting water and contaminants inthe fuel tank. Contaminated fuel cancause poor performance or engine dam-age. Use only fresh gasoline that hasbeen stored in clean containers.

GasoholThere are two types of gasohol: gasohol con-taining ethanol (E10) and that containingmethanol. Ethanol can be used if the ethanolcontent does not exceed 10% and the fuelmeets the minimum octane ratings. All etha-nol blends containing more than 10% ethanolcan cause fuel system damage or cause en-gine starting and running problems. Yamahadoes not recommend gasohol containingmethanol because it can cause fuel systemdamage or engine performance problems.EMU36880

Muddy or acidic waterYamaha strongly recommends that you haveyour dealer install the optional chromium-plat-ed water pump kit if you use the outboard mo-tor in muddy or acidic water conditions.However, depending on the model it might notbe required.

EMU36330

Anti-fouling paintA clean hull improves boat performance. Theboat bottom should be kept as clean of marinegrowth as possible. If necessary, the boat bot-tom can be coated with an anti-fouling paintapproved for your area to inhibit marinegrowth.Do not use anti-fouling paint which includescopper or graphite. These paints can causemore rapid engine corrosion.

EMU36341

Motor disposal requirementsNever illegally discard (dump) the motor.Yamaha recommends consulting the dealerabout discarding the motor.EMU36352

Emergency equipmentKeep the following items onboard in casethere is trouble with the outboard motor.� A tool kit with assorted screwdrivers, pliers,

wrenches (including metric sizes), andelectrical tape.

� Waterproof flashlight with extra batteries.� An extra engine shut-off cord (lanyard) with

clip.� Spare parts, such as an extra set of spark

plugs.Consult your Yamaha dealer for details.

Recommended gasoline:Premium unleaded gasoline with a minimum octane rating of 94 (Re-search Octane Number).



14

EMU25221

Emission control informationEMU25310

U.S. insular areasEngines affixed with the label pictured belowconform to U.S. Environmental ProtectionAgency (EPA) regulations for marine SI en-gines. See the label affixed to your engine fordetails.EMU31570

Approval label of emission control certifi-cateThis label is attached to the bottom cowling.New Technology; (4-stroke) MFI

EMU25332

Manufactured date labelThis label is attached to the clamp bracket orthe swivel bracket.

1. Approval label location

ZMU06894

EMISSION CONTROL INFORMATION MFITHIS ENGINE CONFORMS TO CALIFORNIA AND U.S. EPA EXHAUSTREGULATIONS FOR SI MARINE ENGINES. REFER TO THE OWNER'SMANUAL FOR MAINTENANCE SPECIFICATIONS AND ADJUSTMENTS.MEETS U.S. EPA EVAP STANDARDS USING CERTIFIED COMPONENTS.FAMILY:DISPLACEMENT: litersSPARK PLUG:FUEL: GASOLINE

FELs(HC+NOx / CO): / g/kW-hr MAX POWER: kWIDLE SPEED: ± rpm IN NETRALSPARK PLUG GAP (mm):VALVE LASH (mm) IN: EX:

YAMAHA MOTOR CO.,LTD.

1. Manufactured date label location

Manufactured:

ZMU04346


Components

15

EMU2579W

Components diagramTIP:* May not be exactly as shown; also may not be included as standard equipment on all models(order from dealer).F250B, FL250B

ZMU06243

10

9

11

1. Top cowling2. Anti-cavitation plate3. Trim tab (anode)4. Propeller*5. Cooling water inlet6. Clamp bracket7. Cowling lock lever(s)8. Water separator9. Flushing device10.Tilt support lever11.Power trim and tilt switch


Components

16

ZMU07336

3

5 6

7 8

1 4

2

3

2 3

2

9 10

2

3

1. Digital electronic control (side-mount type)*2. Clip3. Engine shut-off switch4. Switch panel (for use with side-mount type)*5. Digital electronic control (single type)*6. Switch panel (for use with single type)*7. Digital electronic control (twin type)*8. Switch panel (for use with twin type)*9. Digital electronic control (triple type)*10.Switch panel (for use with triple type)*


Components

17

EMU35943

Digital electronic controlThe digital electronic control actuates theshifter, the throttle and remote electrical oper-ations. Make sure that the active indicatorlights and that the digital electronic control unitis correctly connected to the outboard motor.The digital electronic controls of the main sta-tion and sub station have the same functions.

1

3 4

2

ZMU05485

1. Tachometer unit (Square type)*2. Speedometer unit (Square type)*3. Speed & fuel meter unit (Square type)*4. Fuel management meter (Square type)*

1. Control lever2. Neutral interlock trigger3. Digital electronic control-alert indicator4. Digital electronic control-active indicator5. Free throttle switch6. Clip7. Engine shut-off switch8. Throttle friction adjuster9. Power trim and tilt switch

ZMU06225

9

12

678

5

43


Components

18

EMU34973

Digital electronic control-active indi-catorThe digital electronic control-active indicatorindicates that the digital electronic control sys-tem is in the operating state.� Lights: Operation of both shift and throttle

possible.� Blinks (when the gear shift is in neutral

only): Shift not operable. Only throttle oper-ation available.

� Off: Shift and throttle not operable.

1. Control lever2. Digital electronic control-active indicator3. Digital electronic control-alert indicator4. Free throttle switch5. Throttle friction adjuster6. Power trim and tilt switch

1. Control lever2. Digital electronic control-active indicator3. Digital electronic control-alert indicator4. Free throttle switch5. Throttle friction adjuster6. Power trim and tilt switch

ZMU05850

16

54

2

3

ZMU05851

1

6

5

4

3

2

1. Control lever2. Digital electronic control-active indicator3. Digital electronic control-alert indicator4. Free throttle switch5. Throttle friction adjuster6. Power trim and tilt switch7. Engine selector switch

1. Digital electronic control-active indicator

ZMU05959

1

6

5

473

2

ZMU06276

1


Components

19

EMU34984

Digital electronic control-alert indica-torThe digital electronic control-alert indicatorlights when trouble occurs in the connectionbetween the digital electronic control and out-board motor. Consult your Yamaha dealer fordetails.




1

ZMU05888

1

ZMU05890

1

ZMU05966

1. Digital electronic control-alert indicator



ZMU06227

1

1ZMU05889

1ZMU05891


Components

20

EMU35822

Control leverMoving the lever forward from the neutral po-sition engages forward gear. Pulling the leverback from neutral engages reverse. The en-gine will continue to run at idle until the leveris moved 22.5° (a detent can be felt). Movingthe lever farther opens the throttle, and theengine will begin to accelerate.Digital electronic control for twin type has thefunction to automatically synchronize both en-gine speeds.Also digital electronic control for triple typehas the function to automatically synchronizethe engine speeds of the center engine andstarboard side engine, adapting the port sideengine speed.The functions of the control lever for triple-type digital electronic control are as follows.� Operate the port side engine using the port

side control lever.� The center engine runs at the average

speed of port side and starboard side en-gines’ speeds.

� Operate the starboard side engine usingthe starboard side control lever.

EMU26201

Neutral interlock triggerTo shift out of neutral, first pull the neutral in-terlock trigger up.


1ZMU05960

1. Neutral “ ”2. Forward “ ”3. Reverse “ ”4. Shift5. Fully closed6. Throttle7. Fully open

1. Neutral “ ”2. Forward “ ”3. Reverse “ ”4. Shift5. Fully closed6. Throttle7. Fully open

ZMU06228

1N

2F

344

5 5

66

7

7

R

ZMU05878

N1F

7

6

2 R34 4

65

7

5


Components

21

EMU35832

Free throttle switchIn neutral, keep this switch pressed, move thecontrol lever forward, and release the switchafter the digital electronic control-active indi-cator starts blinking. While the indicatorblinks, you can open or close the throttle. Thiscan also be done when the control lever is setin reverse.Single type

Single type

Twin type

1. Neutral interlock trigger

1. Fully open

ZMU06285

1

ZMU06231

NF

ZMU06232

N222.5˚

3

1

2. Fully closed3. Free accelerator

1. Fully open2. Fully closed3. Free accelerator

ZMU05880

F N

ZMU05881

N

1

23 22.5

ZMU05882

NF


Components

22

Triple type

The free throttle switch can only be usedwhen the control lever is in the neutral posi-tion.

During operation the digital electronic control-active indicator changes from continuously litto blinking. When the indicator starts blinking,the throttle begins to open after the control le-ver is moved at least 22.5°.After using the free throttle switch, return thecontrol lever to the neutral position. The freethrottle switch will return automatically to itsset position. The digital electronic control-ac-tive indicator will change from blinking to con-tinuously lit and the digital electronic controlwill then engage forward and reverse normal-ly.EMU35872

Throttle friction adjusterA friction device provides adjustable resis-tance to movement of the control lever, andcan be set according to operator preference.To increase resistance, turn the adjusterclockwise. To decrease resistance, turn theadjuster counterclockwise.

WARNINGEWM01770

� If the friction is too small, the control le-ver could move freely and cause an ac-cident.

� Do not overtighten the friction adjuster.If there is too much resistance, it couldbe difficult to move the control lever,which could result in an accident.

Single type



ZMU05883

N

1

23 22.5

ZMU05961

NF

ZMU05962

N

1

23 22.5

ZMU06233


Components

23

Single type

Twin type

Triple type

When constant speed is desired, tighten theadjuster to maintain the desired throttle set-ting.

EMU35720

Engine selector switchWhen all engines have started, you can selectthe desired engine for operation by pushingthe engine selector switch. The engine selec-tor switch works only when all the control le-vers are in neutral.

EMU35774

Engine shut-off cord (lanyard) and clipThe clip must be attached to the engine shut-off switch for the engine to run. The cordshould be attached to a secure place on theoperator’s clothing, or arm or leg. Should theoperator fall overboard or leave the helm, thecord will pull out the clip, stopping ignition tothe engine. This will prevent the boat fromrunning away under power.

WARNINGEWM01790

� Attach the engine shut-off cord to a se-cure place on your clothing, or your armor leg while operating.

� Do not attach the cord to clothing thatcould tear loose. Do not route the cordwhere it could become entangled, pre-venting it from functioning.

� Avoid accidentally pulling the cord dur-ing normal operation. Loss of enginepower means the loss of most steeringcontrol. Also, without engine power, the

ZMU05820

ZMU05819

ZMU05963

1. Engine selector switch

1

ZMU05977


Components

24

boat could slow rapidly. This couldcause people and objects in the boat tobe thrown forward.

TIP:The engine cannot be started with the clip re-moved.

EMU26091

Main switchThe main switch controls the ignition system;its operation is described below.� “ ” (off)With the main switch in the “ ” (off) posi-tion, the electrical circuits are off, and the keycan be removed.� “ ” (on)With the main switch in the “ ” (on) position,the electrical circuits are on, and the key can-not be removed.� “ ” (start)

1. Cord2. Clip3. Engine shut-off switch


ZMU06235

1 3

2

ZMU04565

12

3



ONSTARTOFF

ONSTARTOFF

1

2

3

ZMU05818

1

2

3

ZMU05978


Components

25

With the main switch in the “ ” (start) po-sition, the starter motor turns to start the en-gine. When the key is released, it returnsautomatically to the “ ” (on) position.

EMU35153

Power trim and tilt switch on digital electronic controlThe power trim and tilt system adjusts the out-board motor angle in relation to the transom.Pressing the switch “ ” (up) trims the out-board motor up, and then tilts it up. Pressingthe switch “ ” (down) tilts the outboard motordown and trims it down. When the switch is re-leased, the outboard motor will stop in its cur-rent position. For instructions on using thepower trim and tilt switch, see pages 59 and61.

ZMU06245

ONOFF START

ONOFF START

ZMU04567

ONOFF START

ONOFF START

ZMU05821

ZMU07340

ONOFF START

ONOFF START

ONOFF START

ZMU06234

UP

DN


Components

26

EMU26154

Power trim and tilt switch on bottom cowlingThe power trim and tilt switch is located on theside of the bottom cowling. Pushing the switch“ ” (up) trims the outboard motor up, andthen tilts it up. Pushing the switch “ ” (down)tilts the outboard motor down and trims itdown. When the switch is released, the out-board motor will stop in its current position.For instructions on using the power trim andtilt switch, see page 61.

WARNINGEWM01031

Use the power trim and tilt switch locatedon the bottom cowling only when the boatis at a complete stop with the engine off.Attempting to use this switch while theboat is moving could increase the risk offalling overboard and could distract theoperator, increasing the risk of collisionwith another boat or an obstacle.

EMU35851

Power trim and tilt switchesThe power trim and tilt system adjusts the out-board motor angle in relation to the transom.Pushing the switch “ ” (up) trims the out-board motor up, and then tilts it up. Pressingthe switch “ ” (down) tilts the outboard motordown and trims it down. When the switch is re-leased, the outboard motor will stop in its cur-rent position.

ZMU05822

UP

DN

1. Power trim and tilt switch

UP

DN

11

1UP

DN

ZMU05835


Components

27

On the twin engine control, the switch on thecontrol grip controls both outboard motors atthe same time.On the triple engine control, the switch on thecontrol grip controls all outboard motors at thesame time.For instructions on using the power trim andtilt switches, see pages 59 and 61.EMU26244

Trim tab with anode

WARNINGEWM00840

An improperly adjusted trim tab couldcause difficult steering. Always test run af-ter the trim tab has been installed or re-placed to be sure steering is correct. Besure you have tightened the bolt after ad-justing the trim tab.

The trim tab should be adjusted so that thesteering control can be turned to either theright or left by applying the same amount offorce.If the boat tends to veer to the left (port side),turn the trim tab rear end to the port side “A” inthe figure. If the boat tends to veer to the right(starboard side), turn the trim tab end to thestarboard side “B” in the figure.

NOTICEECM00840

The trim tab also serves as an anode toprotect the engine from electrochemicalcorrosion. Never paint the trim tab as it willbecome ineffective as an anode.


UP

DN

1

1UP

DN

ZMU05964

1. Trim tab2. Bolt3. Cap

Bolt tightening torque:42.0 Nm (4.28 kgf-m, 31.0 ft-lb)


Components

28

EMU26341

Tilt support lever for power trim and tilt modelTo keep the outboard motor in the tilted up po-sition, lock the tilt support lever to the clampbracket.

NOTICEECM00660

Do not use the tilt support lever or knobwhen trailering the boat. The outboard mo-tor could shake loose from the tilt supportand fall. If the motor cannot be trailered inthe normal running position, use an addi-tional support device to secure it in the tiltposition.

EMU31421

Cowling lock lever (pull up type)To remove the top cowling, pull up the cowlinglock lever(s) and lift off the cowling. To installthe top cowling, place it in its original position,and then move the cowling lock lever(s)downward to lock it in place.

TIP:� When installing the cowling, check to be

sure it fits properly in the rubber seal.� Be sure to check that the gap between the

top cowling and the bottom cowling is evenall around the cowling. If the top cowling isloose or the gap is not even, reinstall thecowling.

EMU26462

Flushing deviceThis device is used to clean the cooling waterpassages of the motor using a garden hoseand tap water.

1. Cowling lock lever(s)

1. Cowling lock lever(s)

ZMU05347

1

ZMU05349

1


Components

29

TIP:For details on usage, see page 69.EMU35562

Fuel filter/Water separatorThis engine has a combination fuel filter/waterseparator and associated alert system. If wa-ter separated from the fuel exceeds a specificvolume, the alert device of 6Y8 MultifunctionTachometer will activate.

Activation of alert device

� The water separator-alert indicator of 6Y8Multifunction Tachometer will blink.

� The buzzer will sound intermittently onlywhen the gear shift is in neutral.

� If the alert system has activated, stop theengine and consult a Yamaha dealer imme-diately.

1. Flushing device


Instruments and indicators

30

EMU31653

6Y8 Multifunction metersMultifunction meters have 6 kinds of meterunits; tachometer unit (square or roundtypes), speedometer unit (square type),speed & fuel meter unit (square or roundtypes), and fuel management meter (squaretype). The indicator system is slightly differentbetween the round and square types. Checkthe model and type of your unit carefully. Thismanual describes mainly the alert indicators.For more details on setting meters or chang-ing indicator systems, see the attached oper-ation manual.EMU36184

6Y8 Multifunction tachometersThe tachometer shows the engine revolutionsper minute. It has functions of trim meter, ad-justing trolling speed, cooling water/enginetemperature display, battery voltage display,total hour/trip hour display, oil pressure dis-play, water detection alert, engine troublealert, and periodic maintenance notification. Ifthe cooling water pressure sensor is installed,the unit can also show the cooling water pres-sure display. However, even if the cooling wa-ter pressure sensor is not installed, thecooling water pressure display can be shownby connecting an optional sensor to the unit.For the optional sensor, consult your Yamahadealer. The tachometer unit is available inround or square types. Check your tachome-ter unit type.

EMU36120

Start-up checksPlace the control lever in neutral and turn themain switch to “ ” (on). After all the displayscome on and the total hour display comes on,the gauge will change to normal operation. Ifthe buzzer sounds and the water separator-alert indicator blinks, consult your Yamahadealer immediately.

TIP:To stop the buzzer, press the “ ” (set) or“ ” (mode) button.

1. Set button2. Mode button

1. Tachometer2. Trim meter3. Multifunction display4. Cooling water pressure5. Cooling water/engine temperature6. Water detection-alert indicator7. Battery voltage8. Oil pressure (4-stroke models)

21

ZMU05415

2

3

1

4

5

6

7

8 ZMU05416



31

EMU37690

Adjusting trolling speedYou can adjust the trolling speed randomly byincreasing or decreasing it approximately 50r/min. When in the trolling speed settingmode, the display switches to the normal dis-play when the engine speed is increased(within 3000 r/min) using the throttle. Whenthe throttle is closed, the display returns to thetrolling speed setting mode. For details, seethe attached operation manual.

TIP:� Trolling is affected by currents and other

operating conditions and may differ fromthe actual engine speed.

� The default engine idle speed is reset auto-matically when the display is switched tothe normal display. The default engine idlespeed is also reset automatically when theengine is turned off or when the enginespeed exceeds 3000 r/min.

� When warming up a cold engine, the trollingspeed cannot be decreased below thespecified engine idle speed.

EMU36130

Low oil pressure-alertIf the engine oil pressure drops too low, thelow oil pressure-alert indicator will start toblink, and the engine speed will automaticallydecrease to about 2000 r/min.

Stop the engine immediately if the buzzersounds and the low oil pressure-alert indicatorblinks. Check the engine oil quantity and re-plenish oil if necessary. If the alert device hasactivated while the appropriate engine oilquantity is maintained, consult your Yamahadealer.

NOTICEECM01601

Do not continue to run the engine if thelow oil pressure alert device has activated.Serious engine damage will occur.

EMU36221

Overheat alertIf the engine temperature rises too high whilecruising, the overheat-alert indicator will startto blink. The engine speed will automaticallydecrease to about 2000 r/min.

ZMU05931

ZMU05430

ZMU05421



32

Stop the engine immediately if the buzzersounds and the overheat alert device has ac-tivated. Check the cooling water inlet for clog-ging.

NOTICEECM01592

� Do not continue to run the engine if theoverheat-alert indicator blinks. Seriousengine damage will occur.

� Do not continue to operate the engine ifa alert device has activated. Consultyour Yamaha dealer if the problem can-not be located and corrected.

EMU36150

Water separator alertThis indicator will blink if water has accumulat-ed in the water separator (fuel filter) whilecruising. In such an event, stop the engine im-mediately and see page 89 of this manual todrain the water from the fuel filter. Get back tothe port soon and consult a Yamaha dealerimmediately.

NOTICEECM00910

Gasoline mixed with water could causedamage to the engine.

EMU36160

Engine trouble alertThis indicator will blink if the engine malfunc-tions while cruising. Get back to the port soonand consult a Yamaha dealer immediately.

NOTICEECM00920

In such an event, the engine will not oper-ate properly. Consult a Yamaha dealer im-mediately.

EMU36170

Low battery voltage-alertIf the battery voltage drops, the low batteryvoltage-alert indicator and the battery voltagevalue will start to blink. Get back to the portsoon if the low battery voltage-alert devicehas activated. For charging the battery, con-sult your Yamaha dealer.

EMU36232

6Y8 Multifunction speed & fuel meters

The speed & fuel meter unit shows the boatspeed and has the functions of fuel meter, to-tal fuel consumption display, fuel economydisplay, fuel flow display, and system voltagedisplay. The chosen display is selected by us-

ZMU05423

ZMU05425

ZMU05427



33

ing the “ ” (set) and “ ” (mode) buttonsas described in this section. If the speed sen-sor is installed, the unit can also show the tripdisplay. However, even if the speed sensor isnot installed, the trip display can be shown byconnecting an optional sensor to the unit. Inaddition, if optional sensors are connected tothe unit, water surface temperature display,depth display, and clock will also be available.For the optional sensors, consult yourYamaha dealer.The speed & fuel meter unit is available inround or square types. Check your speed &fuel meter unit type for operation information.After the main switch is first turned on, all thedisplays come on as a test. After a few sec-onds, the gauge will change to normal opera-tion.For more information, see the operation man-ual originally supplied with the meter.

EMU36241

6Y8 Multifunction speedome-ters

The speedometer unit shows the boat speedand has functions of fuel meter and systemvoltage display. The chosen display is select-ed by using the “ ” (set) and “ ” (mode)buttons as described in this section. In addi-tion, the speedometer can show the desiredunit of measurement such as km/h, mph, orknots. If the speed sensor is installed, the unitcan also show the trip display. However, evenif the speed sensor is not installed, the trip dis-play can be shown by connecting an optionalsensor to the unit. In addition, if optional sen-sors are connected to the unit, water surfacetemperature display, depth display, and clockwill also be available. For the optional sen-sors, consult your Yamaha dealer.After the main switch is first turned on, all thedisplays come on as a test. After a few sec-onds, the gauge will change to normal opera-tion.For more information, see the operation man-ual originally supplied with the meter.


21

ZMU05432

1. Speedometer2. Fuel meter3. Multifunction display

1

23

ZMU05433



34

EMU36250

6Y8 Multifunction fuel manage-ment meters

The fuel management meter has the func-tions of fuel flow meter, total consumption dis-play, fuel economy display, and remainingfuel display. The chosen display is selectedby using the “ ” (set) and “ ” (mode)buttons as described in this section. For moreinformation, see the operation manual origi-nally supplied with the meter.After the main switch is first turned on, all thedisplays come on as a test. After a few sec-onds, the gauge will change to normal opera-tion.For more information, see the operation man-ual originally supplied with the meter.


1. Speedometer2. Fuel meter3. Multifunction display

21

ZMU05436

1

23

ZMU05437


1. Fuel flow meter2. Multifunction display

21

ZMU05438

1

2

ZMU05439


Engine control system

35

EMU26803

Alert system

NOTICEECM00091

Do not continue to operate the engine if aalert device has activated. Consult yourYamaha dealer if the problem cannot be lo-cated and corrected.

EMU35184

Digital Electronic Control alertIf during operation of the outboard motor anycommunication troubles between the digitalelectronic control and the outboard motor oc-cur, the alert indicator will light. Even if there isno symptom of trouble on shifting or throttle,get back to the port soon and have a Yamahadealer inspect or repair the outboard motor.

EMU42350

Overheat alertThis engine has an overheat-alert device. Ifthe engine temperature rises too high, thealert device will activate.� The engine speed will automatically de-

crease to about 2000 r/min.� The overheat-alert indicator of the 6Y8 Mul-

tifunction Tachometer will light or blink.



ZMU06227

1

1ZMU05889



1ZMU05891

1ZMU05960

ZMU05421



36

� The buzzer will sound. If the alert system has activated, stop the en-gine and check the cooling water inlets:� Check trim angle to be sure that the cooling

water inlet is submerged.� Check the cooling water inlet for clogging.

Twin engine drive or triple engine drive users:If the overheat alert system of one engine ac-tivates, the engine will slow down. To switchoff the alert activation on the engine not affect-ed by overheating, turn off the main switch ofthe engine overheating. If the alert systemhas activated, stop the engine and tilt the out-board motor up to check the cooling water in-let for clogging. If the alert system has stillactivated, tilt the overheated outboard motorup and return to the port.EMU35844

Low oil pressure alertIf the oil pressure drops too low, the alert de-vice will activate.� The engine speed will automatically de-

crease to about 2000 r/min. The low oilpressure-alert indicator will light or blink.

ZMU06297

ZMU04583

OFF START

ON ON

OFF START

ZMU05827

ONOFF START

ONOFF START

ONOFF START

ZMU05989

ZMU05826



37

� The buzzer will sound in the same way asduring an overheating alert.

If the alert device has activated, stop the en-gine as soon as it is safe to do so. Check theoil level and add oil as needed. If the oil levelis correct and the alert device does not switchoff, consult your Yamaha dealer.Twin engine drive or triple engine drive users:If the low oil pressure alert system of one en-gine activates, all of the engines will slowdown and the buzzer will sound. To switch offthe alert activation on the engine(s) not affect-ed by low oil pressure, turn off the main switchof the engine with the low oil pressure.

ZMU05430


Installation

38

EMU26902

InstallationThe information presented in this section is in-tended as reference only. It is not possible toprovide complete instructions for every possi-ble boat and motor combination. Propermounting depends in part on experience andthe specific boat and motor combination.

WARNINGEWM01590

� Overpowering a boat could cause se-vere instability. Do not install an out-board motor with more horsepower thanthe maximum rating on the capacityplate of the boat. If the boat does nothave a capacity plate, consult the boatmanufacturer.

� Improper mounting of the outboard mo-tor could result in hazardous conditionssuch as poor handling, loss of control,or fire hazards. For permanently mount-ed models, your dealer or other personexperienced in proper rigging shouldmount the motor.

EMU35811

Mounting the outboard motorThe outboard motor should be mounted sothat the boat is well balanced. Otherwise, theboat could be hard to steer. For single-engineboats, mount the outboard motor on the cen-terline (keel line) of the boat.For twin engine boats, mount the outboardmotors equidistant from the centerline.For triple engine boats, mount the center out-board motor on the centerline (keel line), andthe port side and starboard side outboard mo-tors equidistant from the center outboard mo-tor.Consult your Yamaha dealer or boat manu-facturer for further information on determiningthe proper mounting location.

EMU26933

Mounting height (boat bottom)The mounting height of your outboard motoraffects its efficiency and reliability. If it ismounted too high, propeller ventilation mayoccur, which will reduce propulsion due to ex-cessive propeller slip, and the water intakesfor the cooling system may not get adequatewater supply, which can cause engine over-

1. Center line (keel line)



ZMU017601

ZMU059571


Installation

39

heating. If the engine is mounted too low, wa-ter resistance (drag) will increase, therebyreducing engine efficiency and performance.Most commonly, outboard motor should bemounted so that the anti-cavitation plate is inalignment with the bottom of the boat. The op-timum mounting height of the outboard motoris affected by the boat/motor combination andthe desired use. Test runs at different heightscan help determine the optimum mountingheight. Consult your Yamaha dealer or boatmanufacturer for further information on deter-mining the proper mounting height.

NOTICEECM01634

� Make sure that the idle hole is highenough to prevent water from enteringthe engine even if the boat is stationarywith the maximum load.

� Incorrect engine height or obstructionsto the smooth flow of water (such as thedesign or condition of the boat, or ac-cessories, such as transom ladders ordepth finder transducers) can create air-borne water spray while the boat iscruising. If the outboard motor is operat-ed continuously in the presence of air-borne water spray, enough water couldenter the engine through the air intake

opening in the top cowling to cause se-vere engine damage. Remove the causeof the airborne water spray.

ZMU01762


Operation

40

EMU36381

First-time operationEMU36391

Fill engine oilThe engine is shipped from the factory withoutengine oil. If your dealer did not fill the oil, youmust fill it before starting the engine. NOTICE:Check that the engine is filled with oil be-fore first-time operation to avoid severeengine damage. [ECM01781]

The engine is shipped with the following stick-er, which should be removed after engine oilis filled for the first time. For more informationon checking the engine oil level, see page 42.

EMU30174

Breaking in engineYour new engine requires a period of break-into allow mating surfaces of moving parts towear in evenly. Correct break-in will help en-sure proper performance and longer enginelife. NOTICE: Failure to follow the break-inprocedure could result in reduced enginelife or even severe engine damage. [ECM00801]

EMU27085

Procedure for 4-stroke modelsYour new engine requires a period of 10hours break-in to allow mating surfaces ofmoving parts to wear in evenly.

TIP:Run the engine in the water, under load (ingear with a propeller installed) as follows. For10 hours for breaking in engine avoid extend-ed idling, rough water and crowded areas.

1. For the first hour of operation:Run the engine at varying speeds up to2000 r/min or approximately half throttle.

2. For the second hour of operation:Increase engine speed as much as nec-essary to put the boat on plane (but avoidfull-throttle operation), then back off onthe throttle while keeping the boat at aplaning speed.

3. Remaining 8 hours:Run the engine at any speed. However,avoid operating at full throttle for morethan 5 minutes at a time.

4. After the first 10 hours:Operate the engine normally.

EMU36400

Getting to know your boatDifferent boats handle differently. Operatecautiously while you learn how your boat han-dles under different conditions and with differ-ent trim angles (see page 59).EMU36413

Checks before starting engine

WARNINGEWM01921

If any item in “Checks before starting en-gine” is not working properly, have it in-spected and repaired before operating theoutboard motor. Otherwise, an accidentcould occur.

NOTICEECM00120

Do not start the engine out of water. Over-heating and serious engine damage canoccur.

EMU36421

Fuel levelBe sure you have plenty of fuel for your trip. Agood rule is to use 1/3 of your fuel to get to thedestination, 1/3 to return, and to keep 1/3 asan emergency reserve. With the boat level on

ZMU01710


Operation

41

a trailer or in the water, turn the key to “ ”(on) and check the fuel level. For fuel filling in-structions, see page 45.EMU36431

Remove cowlingFor the following checks, remove the topcowling from the engine. To remove the en-gine cowling, release all the lock levers and liftoff the cowling.

EMU36442

Fuel system

WARNINGEWM00060

Gasoline and its vapors are highly flam-mable and explosive. Keep away fromsparks, cigarettes, flames, or other sourc-es of ignition.

WARNINGEWM00910

Leaking fuel can result in fire or explosion.� Check for fuel leakage regularly.

� If any fuel leakage is found, the fuel sys-tem must be repaired by a qualified me-chanic. Improper repairs can make theoutboard unsafe to operate.

EMU36451

Check for fuel leaks� Check for fuel leaks or gasoline fumes in

the boat.� Check for fuel leakage from the fuel system.� Check the fuel tank and fuel lines for

cracks, swellings, or other damages.EMU37321

Checking the fuel filterCheck that the fuel filter is clean and free ofwater. If any water is found in the fuel, or if asignificant amount of debris is found, the fueltank should be checked and cleaned by aYamaha dealer.

EMU41770

Controls� Turn the main switch “ ” (on) and make

sure that the Digital electronic control-activeindicator comes on.

� Turn the steering wheel full-right and full-left. Make sure operation is smooth and un-restricted throughout the whole range withno binding or excessive free play.

� Operate the throttle levers several times tomake sure there is no hesitation in theirtravel. Operation should be smooth over

ZMU06106

ZMU06108


Operation

42

the complete range of motion, and each le-ver should return completely to the idle po-sition.

EMU36922

Engine shut-off cord (lanyard)Inspect the engine shut-off cord for damage,such as cuts, breaks, and wear.Single type

Single type

Twin type

Triple type

EMU37052

Engine oil1. Put the outboard motor in an upright po-

sition (not tilted). NOTICE: If the motoris not level, the oil level indicated onthe dipstick may not be accurate.[ECM01790]

2. Remove oil dipstick and wipe it clean.3. Insert the dipstick and remove it again.

Be sure to completely insert the dipstickinto the dipstick guide, otherwise the oillevel measurement will be incorrect.

4. Check the oil level using the dipstick to besure the level falls between the upper lev-el mark and lower level mark. Consult



ZMU06235

1 3

2

ZMU04565

12

3



ONSTARTOFF

ONSTARTOFF

1

2

3

ZMU05818

1

2

3

ZMU05978


Operation

43

your Yamaha dealer if the oil level is outof specified level or if it appears milky ordirty.

EMU27153

Engine� Check the engine and engine mounting.� Look for loose or damaged fasteners.� Check the propeller for damage.� Check for engine oil leaks.EMU36492

Flushing deviceCheck that the flushing device’s garden hoseconnector is securely screwed on to the fittingon the bottom cowling. NOTICE: If the gar-den hose connector is not properly con-nected, cooling water can leak out and theengine can overheat during operation.[ECM01801]

EMU36941

Install cowling1. Be sure that all cowling lock levers are re-

leased.2. Be sure that the rubber seal is seated all

the way around the engine.3. Place the cowling on top of the seal.4. Check to be sure it fits properly in the rub-

ber seal.5. Move the levers to lock the cowling as

shown. NOTICE: If the top cowling isnot installed correctly, water spray un-der the top cowling can damage theengine, or the top cowling can blow offat high speeds. [ECM01991]

1. Oil dipstick

1. Oil dipstick2. Lower level mark3. Upper level mark

ZMU05972

1

1 3

2

ZMU07057

1. Fitting2. Flushing device

ZMU06164

1 2


Operation

44

After installing, check the fitting of the topcowling by pushing it with both hands. If thetop cowling is loose, have it repaired by yourYamaha dealer.

EMU35243

Checking power trim and tilt system

WARNINGEWM01930

� Never get under the lower unit while it istilted, even when the tilt support lever islocked. Severe injury could occur if theoutboard motor accidentally falls.

� Body parts can be crushed between themotor and the clamp bracket when themotor is trimmed or tilted.

� Be sure no one is near the outboard mo-tor before performing this check.

1. Check the power trim and tilt unit for anysign of oil leaks.

2. Operate each of the power trim and tiltswitches on the digital electronic controland engine bottom cowling (if equipped)to check that all switches work.

3. Tilt the outboard motor up and check thatthe tilt rod and trim rods are extendedcompletely.

4. Use the tilt support lever to lock the motorin the up position. Operate the tilt downswitch briefly so the motor is supportedby the tilt support lever.

ZMU06131

ZMU06133

1. Tilt rod2. Trim rods


Operation

45

5. Check that the tilt rod and trim rods arefree of corrosion or other flaws.

6. Activate the tilt-down switch until the trimrods have retracted completely into thecylinders.

7. Activate the trim-up switch until the tilt rodis fully extended. Unlock the tilt supportlever.

8. Tilt the outboard motor down. Check thatthe tilt rod and trim rods operate smooth-ly.

EMU36582

BatteryCheck that the battery is in good condition,and fully charged. Check that the battery con-nections are clean, secure and covered by in-sulating covers. The electrical contacts of thebattery and cables must be clean and proper-ly connected or the battery will not start theengine.Refer to the battery manufacturer’s instruc-tions for checks for your particular battery.EMU30025

Filling fuel

WARNINGEWM01830

� Gasoline and its vapors are highly flam-mable and explosive. Always refuel ac-cording to this procedure to reduce therisk of fire and explosion.

� Gasoline is poisonous and can cause in-jury or death. Handle gasoline with care.Never siphon gasoline by mouth. If youshould swallow some gasoline or inhalea lot of gasoline vapor, or get some gas-oline in your eyes, see your doctor im-mediately. If gasoline spills on yourskin, wash with soap and water. If gaso-line spills on your clothing, change yourclothes.

1. Make sure that the engine is stopped.2. Make sure that the boat is in a well-venti-

lated outdoor area, either securelymoored or trailered.

3. Make sure that no one is in the boat.4. Do not smoke and keep away from

sparks, flames, static electric discharge,or other sources of ignition.

1. Tilt support lever

ZMU01885


Operation

46

5. If you use a portable container to storeand dispense fuel, only use a locally ap-proved GASOLINE container.

6. Touch the fuel nozzle to the filler openingor funnel to help prevent electrostaticsparks.

7. Fill the fuel tank, but do not overfill.WARNING! Do not overfill. Otherwisefuel can expand and overflow if thetemperature increases. [EWM02610]

8. Tighten the fuel tank cap securely.9. Wipe up any spilled gasoline immediately

with dry rags. Dispose of rags properlyaccording to local laws or regulations.

EMU27452

Operating engine

WARNINGEWM00420

� Before starting the engine, make surethat the boat is tightly moored and thatyou can steer clear of any obstructions.Be sure there are no swimmers in thewater near you.

� When the air vent screw is loosened,gasoline vapor will be released. Gaso-line is highly flammable, and its vaporsare flammable and explosive. Refrainfrom smoking, and keep away fromopen flames and sparks while looseningthe air vent screw.

� This product emits exhaust gases whichcontain carbon monoxide, a colorless,odorless gas which could cause braindamage or death when inhaled. Symp-toms include nausea, dizziness, anddrowsiness. Keep cockpit and cabin ar-eas well ventilated. Avoid blocking ex-haust outlets.

EMU31812

Sending fuel1. If there is a fuel joint or a fuel cock on the

boat, firmly connect the fuel line to thejoint or open the fuel cock.

2. Squeeze the primer pump, with the arrowpointing up, until you feel it become firm.

EMU27494

Starting engine

WARNINGEWM01600

Before starting the engine, make sure thatthe boat is tightly moored and that you cansteer clear of any obstructions. Be surethere are no swimmers in the water nearyou.

EMU42361

Procedure for starting engine

WARNINGEWM01840

� Failure to attached engine shut-off cordcould result in a runaway boat if opera-tor is ejected. Attach the engine shut-offcord to a secure place on your clothing,or your arm or leg while operating. Donot attach the cord to clothing that couldtear loose. Do not route the cord whereit could become entangled, preventing itfrom functioning.

1. Arrow


Operation

47

� Avoid accidentally pulling the cord dur-ing normal operation. Loss of enginepower means the loss of most steeringcontrol. Also, without engine power, theboat could slow rapidly. This couldcause people and objects in the boat tobe thrown forward.

1. Place the control lever in “ ” (neutral).

TIP:The start-in-gear protection device preventsthe engine from starting except when in neu-tral.2. Attach the engine shut-off cord to a se-

cure place on your clothing, or your armor leg. Then install the clip on the otherend of the cord into the engine shut-offswitch.

ZMU06236

N

ZMU05829

N

ZMU06237

ZMU04628

ONSTARTOFF

ONSTARTOFF

ZMU05828

ZMU05993


Operation

48

3. Turn the main switch to “ ” (on) to makesure that the digital electronic control-ac-tive indicator lights. The engine can notbe started when the digital electronic con-trol-alert indicator lights.

TIP:When the main switch is turned to “ ” (on)with the clip removed from the engine shut-offswitch, the buzzer will sound.4. Turn the main switch to “ ” (start),

and hold it for a maximum of 5 seconds.NOTICE: Never turn the main switch to“ ” (start) while the engine is run-ning. Do not keep the starter motorturning for more than 5 seconds. If thestarter motor is turned continuouslyfor more than 5 seconds, the batterywill be quickly discharged, thus mak-ing it impossible to start the engine.The starter can also be damaged. If theengine will not start after 5 seconds ofcranking, return the main switch to“ ” (on), wait 10 seconds, then crankthe engine again. [ECM00192]

ZMU06246

ONSTART

ONSTART

ZMU04596

ONSTART

ZMU05830

ONSTART

ZMU05994


Operation

49

EMU36510

Checks after starting engineEMU36522

Cooling waterCheck for a steady flow of water from the cool-ing water pilot hole. A continuous flow of waterfrom the pilot hole indicates that the waterpump is pumping water through the coolingwater passages. If the cooling water passag-es are frozen, it may take a while for water tostart flowing out of the pilot hole.

NOTICEECM01810

If water is not flowing out of the pilot holeat all times while the engine is running,overheating and serious damage couldoccur. Stop the engine and check whetherthe cooling water inlet on the lower case orthe cooling water pilot hole is blocked.Consult your Yamaha dealer if the prob-lem cannot be located and corrected.

EMU27670

Warming up engineEMU35264

Electric start modelsAfter the engine has started, warm the engineup until the engine speed settles at idlingspeed.

EMU36531

Checks after engine warm upEMU36541

ShiftingWhile the boat is tightly moored, and withoutapplying throttle, confirm that the engine shiftssmoothly into forward and reverse, and backto neutral.EMU36980

Stop switches� Turn the main switch to “ ”, or press the

engine stop button and make sure the en-gine stops.

� Confirm that removing the clip from the en-gine shut-off switch stops the engine.

� Confirm that the engine cannot be startedwith the clip removed from the engine shut-off switch.

EMU35880

Selecting outboard motor (tri-ple engine)

After all engines have started, set all controllevers to Neutral. Push the engine selectorswitch repeatedly to change the digital elec-tronic control-active indicator and select thedesired engine.


Operation

50

1. First, three engines can be operated.

TIP:When all engines have started, the center en-gine will run at the average speed of port sideand starboard side engines’ speeds.

� Operate the port side engine using theport side control lever.

� The center engine runs at the averagespeed of port side and starboard sideengines’ speeds.

� Operate the starboard side engine us-ing the starboard side control lever.

2. Push the engine selector switch once tooperate the port side and starboard sideengines.

� Operate the port side engine using theport side control lever.

� The center engine runs at the idlingspeed.

� Operate the starboard side engine us-ing the starboard side control lever.

3. Push the engine selector switch twice tooperate the center engine.

1. Port side control lever2. Starboard side control lever3. Port side engine4. Center engine5. Starboard side engine

ZMU05998

P C S

1 2

3 54

ZMU05999

ZMU06000

ZMU06001


Operation

51

� The port side engine runs at the idlingspeed.

� Operate the center engine using theport side control lever.

� The starboard side engine runs at theidling speed.

4. Push the engine selector switch threetimes to operate the three engines.

EMU35124

Shifting

WARNINGEWM00180

Before shifting, make sure there are noswimmers or obstacles in the water nearyou.

Warm up the engine before shifting into gear.Until the engine is warm, the idle speed maybe higher than normal. The control lever of theDigital electronic control can be operatedeven at high engine speeds. However, gearshifting will not work until the engine speedhas automatically decreased to a speed atwhich actual gear shifting is possible. As a re-sult, for quick gear shifting there could be atime lag when the gear is shifted until the en-gine speed has decreased sufficiently.To shift out of neutral1. Pull the neutral interlock trigger up (if

equipped).

ZMU06299

ZMU06002

ZMU06300

ZMU05999


Operation

52

2. Move the control lever firmly and crisplyforward (for forward gear) or backward(for reverse gear) 22.5° (a detent canfelt).

To shift from in gear (forward/reverse) to neu-tral1. Close the throttle so that the engine

slows to idle speed.

2. After the engine is at idle speed in gearmove the control lever firmly and crisplyinto the neutral position.

1. Neutral interlock trigger

ZMU06285

1

ZMU06238

NF R22.5˚22.5˚

ZMU05831

NF R22.5 22.5

ZMU06239

RF

ZMU05832

RF

ZMU06236

N


Operation

53

EMU31742

Stopping boat

WARNINGEWM01510

� Do not use the reverse function to slowdown or stop the boat as it could causeyou to lose control, be ejected, or impactthe steering wheel or other parts of theboat. This could increase the risk of se-rious injury. It could also damage theshift mechanism.

� Do not shift into reverse while travelingat planing speeds. Loss of control, boatswamping, or damage to the boat couldoccur.

The boat is not equipped with a separatebraking system. Water resistance stops it af-ter the throttle lever is moved back to idle. Thestopping distance varies depending on grossweight, water surface conditions, and wind di-rection.EMU42380

Operating the port / center / starboard engine

The outboard motor to be used can be select-ed with the main switch.

NOTICEECM01740

Be sure to tilt the unoperated motor up.Otherwise water could enter the exhaustpipe due to the wave action, causing en-gine trouble.

Operating three outboard motors

ZMU05829

N

1. Port side control lever2. Starboard side control lever3. Port side engine4. Center engine5. Starboard side engine

ZMU06003

P C S

1 2

3 54

ZMU05999


Operation

54

� Operate the port side engine using the portside control lever.

� When all engines have started, the centerengine will run at the average speed of portside and starboard side engines’ speeds.


Operating the port side engine and star-board side engine



Operating the port side engine and centerengine


� Operate the center engine using the star-board side control lever.

Operating the center engine and starboardside engine

ON ON ON

ZMU06004

ZMU06001

ON ON

ZMU06005

ZMU06006

ON ON

ZMU06007

ZMU06008


Operation

55

� Operate the center engine using the portside control lever.


Operating the center engine

� Operate the center engine using the portside control lever.

ON ON

ZMU06009

ZMU06002

ON

ZMU06010


Operation

56

EMU35901

Boat directionThe illustrations below indicate the boat direction when operating the three outboard motors.When using the port side engine, center engine and starboard side engine

:Boat direction and turning forceThe size of the arrow is proportional to the turning force.

:Propulsion

P C S P C S P C S P C S P C S P C S

P C S P C S P C S P C SP C SP C S

ZMU06011


Operation

57

When using the port side engine and starboard side engine


:Propulsion



ZMU06012


Operation

58

When using the center engine


:PropulsionEMU27821

Stopping engineBefore stopping the engine, first let it cool offfor a few minutes at idle or low speed. Stop-ping the engine immediately after operating athigh speed is not recommended.EMU42390

Procedure for stopping engine1. Turn the main switch to “ ” (off).

P C S P C S P C S P C S

ZMU06013

ZMU06247

ONOFF START

ONOFF START

ZMU04599

OFFOFFON ON

ZMU05833


Operation

59

TIP:The engine can also be stopped by pulling thecord and removing the clip from the engineshut-off switch, then turning the main switchto “ ” (off).2. Remove the key if the boat will be left un-

attended.EMU27862

Trimming outboard motor

WARNINGEWM00740

Excessive trim for the operating condi-tions (either trim up or trim down) cancause boat instability and can make steer-ing the boat more difficult. This increasesthe possibility of an accident. If the boatbegins to feel unstable or is hard to steer,slow down and/or readjust the trim angle.

The trim angle of the outboard motor helpsdetermine the position of the bow of the boatin the water. Correct trim angle will help im-prove performance and fuel economy whilereducing strain on the engine. Correct trim an-gle depends upon the combination of boat,engine, and propeller. Correct trim is also af-fected by variables such as the load in theboat, sea conditions, and running speed.

EMU27887

Adjusting trim angle (Power trim and tilt)

WARNINGEWM00753

� Be sure all people are clear of the out-board motor when adjusting the trim an-gle. Body parts can be crushed betweenthe motor and the clamp bracket whenthe motor is trimmed or tilted.

� Use caution when trying a trim positionfor the first time. Increase speed gradu-ally and watch for any signs of instabilityor control problems. Improper trim an-gle can cause loss of control.

� If equipped with a power trim and tiltswitch located on the bottom cowling,use the switch only when the boat is at acomplete stop with the engine off. Donot adjust the trim angle with this switchwhile the boat is moving.

Adjust the outboard motor trim angle usingthe power trim and tilt switch.

OFFOFFON ON

OFFON

ZMU06014

1. Trim operating angle


Operation

60

To raise the bow (trim-out), press the switch“ ” (up).To lower the bow (trim-in), press the switch“ ” (down).Make test runs with the trim set to different an-gles to find the position that works best foryour boat and operating conditions.EMU27912

Adjusting boat trimWhen the boat is on plane, a bow-up attituderesults in less drag, greater stability and effi-ciency. This is generally when the keel line ofthe boat is up about 3 to 5 degrees. With thebow up, the boat may have a greater tenden-cy to steer to one side or the other. Compen-sate for this as you steer. When the bow of theboat is down, it is easier to accelerate from astanding start onto plane.




ZMU06259

UP

1

DN

ZMU05834

UP

1

DN

UP

DN

11

1UP

DN

ZMU05835



UP

DN

1

1UP

DN

ZMU05964


Operation

61

Bow UpToo much trim-out puts the bow of the boattoo high in the water. Performance and econ-omy are decreased because the hull of theboat is pushing the water and there is more airdrag. Excessive trim-out can also cause thepropeller to ventilate, which reduces perfor-mance further, and the boat may “porpoise”(hop in the water), which could throw the op-erator and passengers overboard.

Bow DownToo much trim-in causes the boat to “plow”through the water, decreasing fuel economyand making it hard to increase speed. Operat-ing with excessive trim-in at higher speedsalso makes the boat unstable. Resistance atthe bow is greatly increased, heightening thedanger of “bow steering” and making opera-tion difficult and dangerous.

TIP:Depending on the type of boat, the outboardmotor trim angle may have little effect on thetrim of the boat when operating.EMU27946

Tilting up and downIf the engine will be stopped for some time orif the boat is moored in shallows, the outboardmotor should be tilted up to protect the propel-ler and lower case from damage by collisionwith obstructions, and also to reduce salt cor-rosion.

WARNINGEWM01543

Make sure that all people are clear of theoutboard motor when tilting the outboardmotor up and down. Body parts can becrushed between the outboard motor andthe clamp bracket when the outboard mo-tor is trimmed or tilted.

NOTICEECM00991

� Before tilting the outboard motor, followthe procedure under “Stopping engine”in this chapter. Never tilt the outboardmotor while the engine is running. Se-vere damage from overheating can re-sult.


Operation

62

� To prevent the cooling water passagesfrom becoming frozen when the ambienttemperature is 5°C or below, tilt the out-board motor up after it has beenstopped 30 seconds or more.

EMU35509

Procedure for tilting up (power trim and tilt models)1. Place the control lever in neutral.

2. Press the power trim and tilt switch “ ”(up) until the outboard motor has tilted upcompletely.

ZMU06236

N

ZMU05829

N

ZMU06280

UP

ZMU05837

UP

UP

UP

ZMU05838

UP

UP

ZMU06020


Operation

63

3. Set the tilt support lever to support the en-gine. WARNING! After tilting the out-board motor, be sure to support it withthe tilt support knob or tilt support le-ver. Otherwise the outboard motorcould fall back down suddenly if oil inthe power trim and tilt unit or in thepower tilt unit loses pressure. [EWM00262]

NOTICE: Do not use the tilt support le-ver or knob when trailering the boat.The outboard motor could shakeloose from the tilt support and fall. Ifthe motor cannot be trailered in thenormal running position, use an addi-tional support device to secure it inthe tilt position. For more detailed in-formation, see page 67. [ECM01641]

4. Once the outboard motor is supportedwith the tilt support lever, press the powertrim and tilt switch “ ” (down) to retractthe trim rods. NOTICE: Make sure thatthe trim rods retracts completely dur-ing mooring. This protects the rodsfrom marine growth and corrosion,which could damage the power trimand tilt mechanism. [ECM00252]

ZMU01884


Operation

64

EMU35516

Procedure for tilting down (power trim and tilt models)1. Push the power trim and tilt switch “ ”

(up) until the outboard motor is supportedby the tilt rod and the tilt support lever be-comes free.

2. Release the tilt support lever.

3. Push the power trim and tilt switch “ ”(down) to lower the outboard motor to thedesired position.

EMU28061

Shallow waterEMU32871

Power trim and tilt modelsThe outboard motor can be tilted up partiallyto allow operation in shallow water.

NOTICEECM01490

� If the engine speed is suddenly in-creased when the outboard motor is par-tially tilted up, the power trim and tilt unitcould be damaged.

ZMU06258DN

ZMU05840DN

DN

DN

ZMU05841

DN

DN

ZMU06021


Operation

65

� Do not tilt the outboard motor up so thatthe cooling water inlet on the lower unitis above the surface of the water whensetting up for and cruising in shallowwater. Otherwise severe damage fromoverheating can result.

EMU35236

Procedure for power trim and tilt models1. Place the control lever in neutral.

2. Slightly tilt the outboard motor up to thedesired position using the power trim andtilt switch. WARNING! Using the powertrim and tilt switch on the bottomcowling while the boat is moving orengine is on could increase the risk offalling overboard and could distractthe operator, increasing the risk ofcollision with another boat or an ob-stacle. [EWM01850]

ZMU06236

N

ZMU05829

NZMU06280

UP

ZMU05837

UP

UP

UP

ZMU05838


Operation

66

3. To return the outboard motor to the nor-mal running position, press the powertrim and tilt switch and slowly tilt the out-board motor down.

EMU28195

Cruising in other conditionsCruising in salt waterAfter operating in salt water, flush the coolingwater passages with fresh water to preventthem from becoming clogged. Also rinse theoutside of the outboard motor with fresh wa-ter.Cruising in muddy, turbid, or acidic waterYamaha strongly recommends that you usethe optional chromium-plated water pump kit(see page 13) if you use the outboard motor inacidic water or water with a lot of sediment init, such as muddy or turbid (cloudy) water. Af-ter operating in such water, flush the cooling

passages with fresh water to prevent corro-sion. Also rinse the outside of the outboardmotor with fresh water.

UP

UP

ZMU06020


Maintenance

67

EMU31844

Transporting and storing out-board motor

WARNINGEWM02640

� USE CARE when transporting fuel tank,whether in a boat or car.

� DO NOT fill fuel container to maximumcapacity. Gasoline will expand consider-ably as it warms up and can build uppressure in the fuel container. This cancause fuel leakage and a potential firehazard.

� Leaking fuel is a fire hazard. Tighten se-curely the fuel valve when transportingand storing the outboard motor.

� Never get under the outboard motorwhile it is tilted. Severe injury could oc-cur if the outboard motor accidentallyfalls.

� Do not use the tilt support lever or knobwhen trailering the boat. The outboardmotor could shake loose from the tiltsupport and fall. If the outboard motorcannot be trailered in the normal run-ning position, use an additional supportdevice to secure it in the tilt position.

NOTICEECM02440

When storing the outboard motor for pro-longed time, fuel must be drained from thefuel tank. The deteriorated fuel could clogthe fuel line causing engine start difficultyor malfunction.

Leaking fuel is a fire hazard. When traileringthe boat, close the fuel valve to prevent fuelfrom leaking.The outboard motor should be transportedand stored in the normal running position. Ifthere is insufficient road clearance in this po-

sition, then trailer the outboard motor in the tiltposition using a motor support device such asa transom saver bar. Consult your Yamahadealer for further details.When the outboard motor is tilted prolongedtime for mooring or trailering the boat, closethe fuel valve.EMU30041

Storing outboard motorWhen storing your Yamaha outboard motorfor prolonged periods of time (2 months orlonger), several important procedures mustbe performed to prevent excessive damage. Itis advisable to have your outboard motor ser-viced by an authorized Yamaha dealer prior tostorage. However, you, the owner, with a min-imum of tools, can perform the following pro-cedures.

NOTICEECM01350

� To prevent problems which can becaused by oil entering the cylinder fromthe sump, keep the outboard motor inthe attitude shown when transportingand storing it. Do not store or transportthe outboard motor on its side (not up-right).

� Do not place the outboard motor on itsside before the cooling water hasdrained from it completely, otherwisewater may enter the cylinder through theexhaust port and cause engine trouble.

� Store the outboard motor in a dry, well-ventilated place, not in direct sunlight.

� Drain the remaining gasoline from thevapor separator. Gasoline left in the va-por separator for a prolonged period oftime will break down and could causedamage to the fuel line.


Maintenance

68

EMU28305

ProcedureEMU31380

Draining the gasoline from the vapor sep-arator

TIP:This procedure is performed while the topcowling is removed.Drain the remaining gasoline in the vapor sep-arator into a container. Loosen the drainscrew, and then remove the cap. Push in theair valve with a screwdriver to introduce airinto the float chamber, so that the gasoline willdrain smoothly. Then, tighten the drain screw.

EMU31392

Washing the outboard motor

TIP:This procedure is performed while the topcowling is installed.1. Wash the outboard motor body using

fresh water. NOTICE: Do not spray wa-ter into the air intake. [ECM01840]

2. Drain the cooling water completely out ofthe motor. Clean the body thoroughly.

EMU28402

Lubrication1. Install the spark plug(s) and torque to

proper specification. For information onspark plug installation, see page 75.

2. Change the gear oil. For instructions, seepage 80. Inspect the oil for the presenceof water that indicates a leaky seal. Sealreplacement should be performed by anauthorized Yamaha dealer prior to use.

1. Vapor separator2. Drain screw3. Cap

ZMU04261

1. Air valve


Maintenance

69

3. Grease all grease fittings. For further de-tails, see page 74.

TIP:For long-term storage, fogging the enginewith oil is recommended. Contact yourYamaha dealer for information about foggingoil and procedures for your engine.EMU34741

Flushing power unitPerform this procedure right after operationfor the most thorough flushing.

NOTICEECM01530

Do not perform this procedure while theengine is running. The water pump may bedamaged and severe damage from over-heating can result.

1. After shutting off the engine, unscrew thegarden hose connector from the fitting onthe bottom cowling.

2. Screw the garden hose adapter onto agarden hose, which is connected to afresh water supply, and then connect it tothe garden hose connector.

3. With the engine off, turn on the water tapand let the water flush through the cool-ing passages for about 15 minutes. Turnoff the water and disconnect the gardenhose adapter from the garden hose con-nector.

4. Reinstall the garden hose connector ontothe fitting on the bottom cowling. Tightenthe connector securely. NOTICE: Do notleave the garden hose connectorloose on the bottom cowling fitting orlet the hose hang free during normaloperation. Water will leak out of theconnector instead of cooling the en-gine, which can cause serious over-heating. Be sure the connector istightened securely on the fitting afterflushing the engine. [ECM00541]

TIP:When flushing the engine with the boat in thewater, tilting up the outboard motor until it iscompletely out of the water will achieve betterresults.EMU28461

Checking painted surface of outboard motorCheck the outboard motor for scratches,nicks, or flaking paint. Areas with damagedpaint are more likely to corrode. If necessary,clean and paint the areas. A touch-up paint isavailable from your Yamaha dealer.

1. Fitting2. Garden hose connector

3. Garden hose adapter


Maintenance

70

EMU2850B

Periodic maintenance

WARNINGEWM01871

These procedures require mechanicalskills, tools, and supplies. If you do nothave the proper skills, tools, or supplies toperform a maintenance procedure, have aYamaha dealer or other qualified mechan-ic do the work.The procedures involve disassemblingthe motor and exposing dangerous parts.To reduce the risk of injury from moving,hot, or electrical parts:� Turn off the engine and keep the key(s)

and engine shut-off cord (lanyard) withyou when you perform maintenance un-less otherwise specified.

� The power trim and tilt switches operateeven when the ignition key is off. Keeppeople away from the switches whenev-er working around the motor. When themotor is tilted, keep away from the areaunder it or between it and the clampbracket. Be sure no one is in this areabefore operating the power trim and tiltmechanism.

� Allow the engine to cool before handlinghot parts or fluids.

� Always completely reassemble the mo-tor before operation.

Maintenance, replacement, or repair of theemission control devices and systems onmodels affixed with an emission controllabel may be performed by any marine en-gine repair establishment or individual. Allwarranty repairs, however, includingthose to the emission control system,must be performed by an authorizedYamaha marine dealership.

EMU28511

Replacement partsIf replacement parts are necessary, use onlygenuine Yamaha parts or parts of equivalentdesign and quality. Any part of inferior qualitymay malfunction, and the resulting loss ofcontrol could endanger the operator and pas-sengers. Yamaha genuine parts and acces-sories are available from your Yamahadealer.EMU34151

Severe operating conditionsSevere operating conditions involve one ormore of the following types of operation on aregular basis:� Operating continuously at or near maxi-

mum engine speed (rpm) for many hours� Operating continuously at a low engine

speed (rpm) for many hours� Operating without sufficient time for engine

to warm up and cool down� Frequent quick acceleration and decelera-

tion� Frequent shifting� Frequently starting and stopping the en-

gine(s)� Operation that fluctuates often between

light and heavy cargo loadsOutboard motors operating under any ofthese above conditions require more frequentmaintenance. Yamaha recommends that youdo this service twice as often as specified inthe maintenance chart. For example, if a par-ticular service should be done at 50 hours, doit instead at 25 hours. This will help preventmore rapid deterioration of engine compo-nents.


Maintenance

71

EMU34446

Maintenance chart 1TIP:� Refer to the sections in this chapter for explanations of each owner-specific action.� The maintenance cycle on these charts assume usage of 100 hours per year and regular

flushing of the cooling water passages. Maintenance frequency should be adjusted when op-erating the engine under adverse conditions such as extended trolling.

� Disassembly or repairs may be necessary depending on the outcome of maintenancechecks.

� Expendable or consumable parts and lubricants will lose their effectiveness over time andthrough normal usage regardless of the warranty period.

� When operating in salt water, muddy, other turbid (cloudy), acidic water, the engine shouldbe flushed with clean water after each use.

The “ ” symbol indicates the check-ups which you may carry out yourself.The “ ” symbol indicates work to be carried out by your Yamaha dealer.

Item Actions

Initial Every

20 hours (3 months)

100 hours (1 year)

300 hours (3 years)

500 hours (5 years)

Anode(s) (external) Inspection or replace-ment as necessary

Anode(s) (cylinder head, thermostat cov-er)

Inspection or replace-ment as necessary

Anodes (exhaust cover, cooling water passage cover, Rectifier Regula-tor cover)

Replacement

Battery (electrolyte lev-el, terminal) Inspection

Battery (electrolyte lev-el, terminal)

Fill, charging or replac-ing as necessary

Cooling water leakage Inspection or replace-ment as necessary

Cowling lock lever Inspection

Engine starting condi-tion/noise Inspection

Engine idle speed/noise Inspection

Engine oil Replacement

Engine oil filter (car-tridge) Replacement

Fuel filter (can be dis-assembled)



Maintenance

72

Fuel line (High pres-sure) Inspection

Fuel line (High pres-sure)


Fuel line (Low pres-sure) Inspection

Fuel line (Low pres-sure)


Fuel pump Inspection or replace-ment as necessary

Fuel/engine oil leakage Inspection

Gear oil Replacement

Greasing points Greasing

Impeller/water pump housing


Impeller/water pump housing Replacement

OCV (Oil Control Valve) filter Replacement

Power trim and tilt unit Inspection

Propeller/propeller nut/cotter pin


PCV (Pressure Con-trol Valve)


Spark plug(s) Inspection or replace-ment as necessary

Spark plug caps/spark plug wires


Water from the cooling water pilot hole Inspection

Thermostat Inspection or replace-ment as necessary

Timing belt Inspection or replace-ment as necessary

Valve clearance Inspection and adjust-ment

Cooling water inlet Inspection

Main switch/stop switch Inspection or replace-ment as necessary

Item Actions

Initial Every

20 hours (3 months)

100 hours (1 year)

300 hours (3 years)

500 hours (5 years)


Maintenance

73

EMU34451

Maintenance chart 2

Wire harness connec-tions/wire coupler con-nections


(Yamaha) Meter/gauge Inspection

Item ActionsEvery

1000 hours

Exhaust guide/exhaust manifold


Timing belt Replacement

Item Actions

Initial Every

20 hours (3 months)

100 hours (1 year)

300 hours (3 years)

500 hours (5 years)


Maintenance

74

EMU28943

GreasingYamaha grease A (water resistant grease)Yamaha grease D (corrosion resistant grease; for propeller shaft)F250B, FL250B

ZMU06248


Maintenance

75

EMU30778

Cleaning and adjusting spark plugThe spark plug is an important engine compo-nent and is easy to inspect. The condition ofthe spark plug can indicate something aboutthe condition of the engine. For example, if thecenter electrode porcelain is very white, thiscould indicate an intake air leak or carburetionproblem in that cylinder. Do not attempt to di-agnose any problems yourself. Instead, takethe outboard motor to a Yamaha dealer. Youshould periodically remove and inspect thespark plug because heat and deposits willcause the spark plug to slowly break downand erode.1. Remove the bolts to remove the ECM

(Electronic control module) cover.

2. Remove the bolts that are securing theignition coil, and then remove the ignitioncoil. Do not use any tools to remove or in-stall the ignition coil, otherwise the igni-tion coil coupler may get damaged.

3. Remove the spark plug. If electrode ero-sion becomes excessive, or if carbon andother deposits are excessive, you shouldreplace the spark plug with another of thecorrect type. WARNING! When remov-ing or installing a spark plug, be care-ful not to damage the insulator. Adamaged insulator could allow exter-nal sparks, which could lead to explo-sion or fire. [EWM00561]

4. Be sure to use the specified spark plug,otherwise the engine may not operateproperly. Before fitting the spark plug,measure the electrode gap with a wirethickness gauge; replace it if out of spec-ification.

1. Bolts2. ECM (Electronic Control Module) cover

1. Bolt2. Ignition coil

Standard spark plug:LFR6A-11


Maintenance

76

5. When fitting the plug, wipe off any dirtfrom the threads, and then screw it in tothe correct torque.

TIP:If a torque-wrench is not available when youare fitting a spark plug, a good estimate of thecorrect torque is 1/4 to 1/2 turn past finger-tight. Have the spark plug adjusted to the cor-rect torque as soon as possible with a torque-wrench.6. Install the ignition coil and tighten the

bolts.

7. Install the ECM (Electronic control mod-ule) cover and tighten the bolts.

EMU35591

Inspecting idling speed

NOTICEECM01690

This procedure must be performed whilethe outboard motor is in the water.

Perform this procedure using the 6Y8 Multi-function Tachometer. Results may vary de-pending on whether testing is conducted withthe outboard motor in the water.1. Start the engine and allow it to warm up

fully in neutral until it is running smoothly.2. Once the engine has warmed up, verify

whether the idle speed is set to specifica-tion. For idle speed specifications, seepage 9.

EMU37494

Changing engine oil

NOTICEECM01710

Change the engine oil after the first 20hours of operation or 3 months, and every100 hours or at 1-year intervals thereafter.Otherwise the engine will wear quickly.

The engine oil should be extracted with an oilchanger.1. Put the outboard motor in an upright po-

sition (not tilted). NOTICE: If the out-board motor is not level, the oil levelindicated on the oil dipstick may notbe accurate. [ECM01861]

1. Spark plug gap2. Spark plug part number3. Spark plug I.D. mark (NGK)

Spark plug gap:1.0–1.1 mm (0.039–0.043 in)

Spark plug torque:25.0 Nm (2.55 kgf-m, 18.4 ft-lb)




Maintenance

77

2. Start the engine. Warm it up and keep theidle speed for 5-10 minutes.

3. Stop the engine and leave it for 5-10 min-utes.

4. Remove the top cowling.5. Remove the oil filler cap. Pull out the dip-

stick and use the oil changer to extractthe oil completely.

6. Add the correct amount of oil through thefiller hole. Put back the filler cap and thedipstick. NOTICE: Overfilling the oilcould cause leakage or damage. If theoil level is above the upper level mark,drain until the level meets the speci-fied capacity. [ECM01850]

7. Leave the outboard motor for 5-10 min-utes.

8. Remove oil dipstick and wipe it clean.9. Insert the dipstick and remove it again.

Be sure to completely insert the dipstickinto the dipstick guide, otherwise the oillevel measurement will be incorrect.

10. Recheck the oil level using the dipstick tobe sure the level falls between the upperand lower marks. Consult your Yamahadealer if the oil level is out of specified lev-el.

1. Oil changer

1. Oil filler cap

Recommended engine oil:4-stroke outboard motor oil

Replacement engine oil quantity (at peri-odic maintenance):

Without oil filter replacement:4.5 L (4.76 US qt, 3.96 Imp.qt)

With oil filter replacement:4.7 L (4.97 US qt, 4.14 Imp.qt)


Maintenance

78

11. Start the engine and make sure that thelow oil pressure-alert indicator remainsoff. Also, make sure that there are no oilleaks. NOTICE: If the low oil pressure-alert indicator comes on or if there areoil leaks, stop the engine and find thecause. Continued operation with aproblem could cause severe enginedamage. Consult your Yamaha dealerif the problem cannot be located andcorrected. [ECM01622]

12. Dispose of used oil according to localregulations.

TIP:� For more information on the disposal of

used oil, consult your Yamaha dealer.� Change the oil more often when operating

the engine under adverse conditions suchas extended trolling.

EMU29114

Inspecting wiring and connectors� Inspect that each connector is engaged se-

curely.� Inspect that each ground lead is properly

secured.

EMU29174

Checking propeller

WARNINGEWM01881

You could be seriously injured if the en-gine accidentally starts when you are nearthe propeller. Before inspecting, remov-ing, or installing the propeller, place theshift control in neutral, turn the mainswitch to “ ” (off) and remove the key,and remove the clip from the engine shut-off switch. Turn off the battery cut-offswitch if your boat has one.

Do not use your hand to hold the propellerwhen loosening or tightening the propellernut. Put a wood block between the anti-cavi-tation plate and the propeller to prevent thepropeller from turning.

1. Oil dipstick2. Lower level mark3. Upper level mark

1 3

2

ZMU07057


Maintenance

79

Checkpoints� Check each of the propeller blades for ero-

sion from cavitation or ventilation, or otherdamage.

� Check the propeller shaft for damage.� Check the splines for wear or damage.� Check for fish line tangled around the pro-

peller shaft.

� Check the propeller shaft oil seal for dam-age.

EMU30662

Removing propellerEMU29197

Spline models1. Straighten the cotter pin and pull it out us-

ing a pair of pliers.2. Remove the propeller nut, washer, and

spacer (if equipped). WARNING! Do notuse your hand to hold the propellerwhen loosening the propeller nut.[EWM01890]

3. Remove the propeller, washer (ifequipped), and thrust washer.

EMU30672

Installing propellerEMU29244

Spline models

WARNINGEWM00770

On counter rotation models, be sure touse a propeller intended for counterclock-wise rotation. These propellers are identi-fied with the letter “L” after the sizeindication on the propeller. Otherwise theboat could move in the opposite directionfrom that expected.

NOTICEECM00501

Make sure to use a new cotter pin andbend the ends over securely. Otherwise,the propeller could come off during opera-tion and be lost.

1. Apply Yamaha marine grease or a corro-sion resistant grease to the propellershaft.

1. Cotter pin2. Propeller nut3. Washer4. Spacer5. Propeller6. Thrust washer


Maintenance

80

2. Install the thrust washer and propeller onthe propeller shaft. NOTICE: Make sureto install the thrust washer before in-stalling the propeller. Otherwise, thelower case and propeller boss couldbe damaged. [ECM01881]

3. Install the spacer and washer. Tightenthe propeller nut to the specified torque.

4. Align the propeller nut with the propellershaft hole. Insert a new cotter pin in thehole and bend the cotter pin ends.NOTICE: Do not reuse the cotter pin.Otherwise, the propeller can come offduring operation. [ECM01891]

TIP:If the propeller nut does not align with the pro-peller shaft hole after tightening to the speci-fied torque, tighten the nut further to align itwith the hole.EMU31915

Changing gear oil

WARNINGEWM00800

� Be sure the outboard motor is securelyfastened to the transom or a stablestand. You could be severely injured ifthe outboard motor falls on you.

� Never get under the lower unit while it istilted, even when the tilt support lever orknob is locked. Severe injury could oc-cur if the outboard motor accidentallyfalls.

1. Tilt the outboard motor so that the gear oildrain screw is at the lowest point possi-ble.

2. Place a suitable container under the gearcase.

3. Remove the cooling water inlet covers onboth sides of the gear case. Be carefulnot to lose the bolt and nut.

4. Remove the gear oil drain screw and gas-ket. The screw is magnetic so a smallquantity of metal particles on the end ofthe screw is normal. Simply removethem. NOTICE: If there is an excessivequantity of metal particles on the mag-netic gear oil drain screw, this can in-dicate lower unit problem. Consultyour Yamaha dealer. [ECM01900]

Propeller nut tightening torque:55.0 Nm (5.61 kgf-m, 40.6 ft-lb)


Maintenance

81

5. Remove the oil level plug and gasket toallow the oil to drain completely.NOTICE: Check the used gear oil afterit has been drained. If the gear oil ismilky or contains water or a largeamount of metal particles, the gearcase may be damaged. Have aYamaha dealer check and repair theoutboard motor. [ECM00713]

TIP:For disposal of used oil, consult your Yamahadealer.6. Put the outboard motor in a vertical posi-

tion. Using a flexible or pressurized fillingdevice, inject the gear oil into the gear oildrain screw hole.

7. Put a new gasket on the oil level plug.When the oil begins to flow out of the oillevel plug hole, insert and tighten the oillevel plug.

8. Put a new gasket on the gear oil drainscrew. Insert and tighten the gear oildrain screw.

9. Securely install the cooling water inletcovers on both sides of the gear case us-ing the bolt and nut removed earlier.

1. Oil level plug2. Gasket3. Cooling water inlet cover4. Bolt5. Gear oil drain screw6. Nut

5 2

6

34

3

1

2

ZMU05487

Recommended gear oil:Hypoid gear oil SAE#90

Gear oil quantity:F250BET 0.918 L (0.970 US qt, 0.808 Imp.qt)FL250BET 0.803 L (0.849 US qt, 0.707 Imp.qt)

Tightening torque:9.0 Nm (0.92 kgf-m, 6.6 ft-lb)




Maintenance

82

EMU29313

Inspecting and replacing anode(s)Yamaha outboard motors are protected fromcorrosion by sacrificial anodes. Inspect theexternal anodes periodically. Remove scalesfrom the surfaces of the anodes. Consult aYamaha dealer for replacement of externalanodes.

NOTICEECM00720

Do not paint anodes, as this would renderthem ineffective.

TIP:Inspect ground leads attached to external an-odes on equipped models. Consult a Yamahadealer for inspection and replacement of inter-nal anodes attached to the power unit.EMU29323

Checking battery (for electric start models)

WARNINGEWM01902

Battery electrolyte is poisonous and caus-tic, and batteries generate explosive hy-drogen gas. When working near thebattery:� Wear protective eye gear and rubber

gloves.� Do not smoke or bring any other source

of ignition near the battery.

The procedure for checking the battery variesfor different batteries. This procedure con-tains typical checks that apply to many batter-ies, but you should always refer to the batterymanufacturer’s instructions.

NOTICEECM01920

A poorly maintained battery will quicklydeteriorate.

1. Check the electrolyte level.


Maintenance

83

2. Check the battery’s charge. If your boat isequipped with the digital speedometer,the voltmeter and low battery alert func-tions will help you monitor the battery’scharge. If the battery needs charging,consult your Yamaha dealer.

3. Check the battery connections. Theyshould be clean, secure, and covered byan insulating cover. WARNING! Badconnections can produce shorting orarcing and cause an explosion. [EWM01912]

EMU35604

Connecting the battery

WARNINGEWM00572

Mount the battery holder securely in a dry,well-ventilated, vibration-free location inthe boat. Install a fully charged battery inthe holder.

NOTICEECM01124

Do not reverse the battery cables. Other-wise, the electrical parts could be dam-aged.

1. Make sure the main switch (on applicablemodels) is “ ” (off) before working onthe battery.

2. Connect the red battery cable to thePOSITIVE (+) terminal first. Then con-nect the black battery cable to the NEGA-TIVE (-) terminal.

3. The electrical contacts of the battery andcables must be clean and properly con-nected, or the battery will not start the en-gine.

Connecting an accessory battery (optional)If connecting an accessory battery, consultyour Yamaha dealer about correct wiring. It isrecommendable to install the fuse to the isola-tor lead as shown in the illustration. For thefuse size, be sure to follow local regulations.For example, for USA, the ABYC rules (E-11)should be observed.

1. Red cable2. Black cable3. Battery

ZMU01811

1

23


Maintenance

84

Single engine Twin engines

1. Isolator lead with circuit protection2. Red cable3. Black cable4. Fuse5. Battery for accessories6. Battery for starting7. Negative connecting cable

2 1

7

6 5

3

4

ZMU05939

1. Starboard side engine2. Port side engine3. Red cable4. Black cable5. Isolator leads with circuit protection6. Fuse7. Battery for starting8. Battery for accessories9. Negative connecting cable

ZMU05941

1

3

9

34

6

4

2

5

7 8 7


Maintenance

85

Triple engines

EMU29371

Disconnecting the battery1. Turn off the battery cut-off switch (if

equipped) and main switch. NOTICE: Ifthey are left on, the electrical systemcan be damaged. [ECM01930]

2. Disconnect the negative cable(s) fromthe negative (-) terminal. NOTICE: Al-ways disconnect all negative (-) ca-bles first to avoid a short circuit anddamage to the electrical system.[ECM01940]

3. Disconnect the positive cable(s) and re-move the battery from the boat.

4. Clean, maintain, and store the battery ac-cording to the manufacturer’s instruc-tions.

1. Starboard side engine2. Center engine3. Port side engine4. Red cable5. Black cable6. Isolator leads with circuit protection7. Fuse8. Battery for starting9. Battery for accessories10.Negative connecting cable

ZMU05956

45

45

45

67

1

8 8 8

9

2 3

10


Trouble Recovery

86

EMU41860

TroubleshootingThis section describes the likely causes andremedies for problems, such as those in thefuel, compression, and ignition systems, poorstarting, and loss of power. Please note thatall of the items in this section may not apply toyour model.If your outboard motor requires repair, bring itto a Yamaha dealer.If the engine trouble-alert indicator is blinking,consult your Yamaha dealer.

Starter will not operate.Q. Does the Digital electronic control-alert in-dicator come on?A. Have serviced by a Yamaha dealer.

Q. Is control lever in gear?A. Shift to neutral.

Q. Is battery capacity low or weak?A. Check battery condition. Use battery of rec-ommended capacity.

Q. Are battery connections corroded orloose?A. Tighten battery cables and clean batteryterminals.

Q. Is fuse for starter relay or electric circuitblown?A. Check for cause of electric overload andrepair. Replace fuse with one of correct am-perage.

Q. Are starter components malfunctioning?A. Have serviced by a Yamaha dealer.

Engine will not start (starter operates).Q. Is clip on engine shut-off cord (lanyard) in-stalled?

A. Install clip to engine shut-off switch.

Q. Is fuel tank empty?A. Fill tank with clean, fresh fuel.

Q. Is fuel contaminated or stale?A. Fill tank with clean, fresh fuel.

Q. Is fuel filter clogged?A. Clean or replace fuel filter.

Q. Is fuel pump malfunctioning?A. Have serviced by a Yamaha dealer.

Q. Are spark plugs fouled or of incorrect type?A. Inspect spark plugs. Clean or replace withrecommended type.

Q. Are ignition parts malfunctioning?A. Have serviced by a Yamaha dealer.

Q. Is ignition wiring damaged or poorly con-nected?A. Inspect wires for breaks and wear. Haveconnections tightened and broken or wornwires replaced by a Yamaha dealer.

Q. Are engine inner parts damaged?A. Have serviced by a Yamaha dealer.

Engine idles irregularly or stalls.Q. Are spark plugs fouled or of incorrect type?A. Inspect spark plugs. Clean or replace withrecommended type.

Q. Is fuel system clogged?A. Inspect for pinched or kinked fuel line orother obstructions in fuel system.

Q. Is fuel contaminated or stale?


Trouble Recovery

87

A. Fill tank with clean, fresh fuel.


Q. Are ignition parts malfunctioning?A. Have serviced by a Yamaha dealer.

Q. Has alert system activated?A. Find and correct cause of alert.

Q. Is spark plug gap incorrect?A. Replace spark plug.


Q. Is specified engine oil not being used?A. Inspect engine oil and replace with speci-fied type.

Q. Is thermostat clogged or malfunctioning?A. Have serviced by a Yamaha dealer.


Q. Is fuel tank air vent restricted or clogged?A. Remove obstruction.

Q. Is fuel joint connection incorrect?A. Connect correctly.

Q. Is battery cable disconnected?A. Connect securely.

Alert buzzer sounds or indicator lights.Q. Is cooling system clogged?

A. Inspect cooling water inlet for obstructions.

Q. Is low oil pressure-alert indicator on orblinking?A. Have serviced by a Yamaha dealer.

Q. Is heat range of spark plugs incorrect?A. Inspect spark plugs and replace with rec-ommended type.

Q. Is specified engine oil not being used?A. Inspect engine oil and replace with speci-fied type.

Q. Is engine oil contaminated or deteriorated?A. Replace engine oil with specified type.

Q. Is oil filter clogged?A. Have serviced by a Yamaha dealer.

Q. Is oil pump malfunctioning?A. Have serviced by a Yamaha dealer.

Q. Is thermostat or water pump malfunction-ing?A. Have serviced by a Yamaha dealer.

Q. Is there excess water in fuel filter?A. Drain fuel filter.

Engine power loss.Q. Is propeller damaged?A. Have propeller repaired or replaced.

Q. Is propeller pitch or diameter incorrect?A. Install correct propeller to operate outboardmotor at its recommended speed (r/min)range.

Q. Is outboard motor mounted at incorrectheight on transom?


Trouble Recovery

88

A. Have outboard motor adjusted to propertransom height.

Q. Has alert system activated?A. Find and correct cause of alert.

Q. Is boat bottom fouled with marine growth?A. Clean boat bottom.

Q. Are spark plugs fouled or of incorrect type?A. Inspect spark plugs. Clean or replace withrecommended type.

Q. Are weeds or other foreign material tan-gled on gear housing?A. Remove foreign material and clean lowerunit.

Q. Is fuel system clogged?A. Inspect for pinched or kinked fuel line orother obstructions in fuel system.


Q. Is fuel contaminated or stale?A. Fill tank with clean, fresh fuel.

Q. Is spark plug gap incorrect?A. Replace spark plug.


Q. Are electrical parts malfunctioning?A. Have serviced by a Yamaha dealer.

Q. Is specified fuel not being used?

A. Replace fuel with specified type.

Q. Is specified engine oil not being used?A. Replace engine oil with specified type.

Q. Is thermostat clogged or malfunctioning?A. Have serviced by a Yamaha dealer.

Q. Is fuel tank air vent restricted or clogged?A. Remove obstruction.


Q. Is fuel joint connection incorrect?A. Connect correctly.

Q. Is heat range of spark plugs incorrect?A. Inspect spark plugs and replace with rec-ommended type.

Q. Is engine not responding properly to con-trol lever position?A. Have serviced by a Yamaha dealer.

Engine vibrates excessively.Q. Is propeller damaged?A. Have propeller repaired or replaced.

Q. Is propeller shaft damaged?A. Have serviced by a Yamaha dealer.

Q. Are weeds or other foreign material tan-gled on propeller?A. Remove and clean propeller.

Q. Are outboard motor mounting bolts loose?A. Tighten bolts or have serviced by aYamaha dealer.

Q. Is steering pivot loose or damaged?


Trouble Recovery

89

A. Have serviced by a Yamaha dealer.EMU29433

Temporary action in emergencyEMU29441

Impact damage

WARNINGEWM00870

The outboard motor can be seriously dam-aged by a collision while operating ortrailering. Damage could make the out-board motor unsafe to operate.

If the outboard motor hits an object in the wa-ter, follow the procedure below.

1. Stop the engine immediately.2. Check the control system and all compo-

nents for damage. Also, check the boatfor damage.

3. Whether damage is found or not, returnto the nearest harbor slowly and careful-ly.

4. Have a Yamaha dealer check the out-board motor before operating it again.

EMU35790

Running in an emergency (twin en-gines or triple engines)Normally use all outboard motors together forcruising. When using only one or two enginesin an emergency, be sure to keep the unusedengine(s) tilted up and operate the other en-gine(s) at low speed.

NOTICEECM01730

If the boat is operated with only one or twoengines, be sure to tilt the unused en-gine(s) up. Otherwise water could enterthe exhaust pipe due to the wave action,causing engine trouble.

TIP:When maneuvering at low speed, such asnear a dock, it is recommended to tilt the un-used engine(s) down and to operate the un-used engine(s) in neutral gear if possible.

EMU29473

Replacing fuseIf a fuse has blown, remove the electrical cov-er, open the fuse holder and remove the fusewith a fuse puller (if equipped). Replace it witha spare one of the proper amperage.

WARNINGEWM00631

Substituting an incorrect fuse or a piece ofwire could allow excessive current flow.This could cause electric system damageand a fire hazard.

Consult your Yamaha dealer if the new fuseimmediately blows again.


Trouble Recovery

90

EMU29524

Power trim and tilt will not operateIf the engine cannot be tilted up or down withthe power trim and tilt because of a dis-charged battery or a failure with the powertrim and tilt unit, the engine can be tilted man-ually.1. Loosen the manual valve screw by turn-

ing it counterclockwise until it stops.

2. Put the engine in the desired position,then tighten the manual valve screw byturning it clockwise.

EMU37571

Water separator-alert indicator blinks while cruising

WARNINGEWM01500

Gasoline is highly flammable, and its va-pors are flammable and explosive.� Do not perform this procedure on a hot

or running engine. Allow the engine tocool.

� There will be fuel in the fuel filter. Keepaway from sparks, cigarettes, flames orother sources of ignition.

� This procedure will allow some fuel tospill. Catch fuel in a rag. Wipe up anyspilled fuel immediately.

1. Electrical cover2. Fuse puller3. Spare fuse (5 A, 10 A, 15 A, 20 A, 30 A, 60

A)

1. Electric throttle valve / ECM (Electronic con-trol module) fuse (10 A)

2. Ignition coil / Fuel injector / Variable cam-shaft timing / ECM (Electronic Control Mod-ule) fuse (30 A)

3. Shift actuator fuse (15 A)4. Main switch / PTT switch fuse (20 A)5. Starter relay fuse (30 A)6. Fuel feed pump fuse (5 A)7. Fuel pump fuse (15 A)

ZMU06288

1 2 3 4 5 6 7 8 9

8. Engine main fuse (60 A)9. Isolator fuse (60 A)

1. Manual valve screw

1ZMU01905


Trouble Recovery

91

� The fuel filter must be reassembledcarefully with the O-ring, filter cup, andhoses in place. Improper assembly orreplacement could result in a fuel leak,which could result in a fire or explosionhazard.

If the water separator-alert indicator on the6Y8 Multifunction tachometer blinks, performthe following procedure.

1. Stop the engine.2. Remove the top cowling.3. Remove the holder.

4. Disconnect the water detection switchcoupler. NOTICE: Be careful not to getany water on the water detectionswitch coupler, otherwise a malfunc-tion could occur. [ECM01950]

5. Unscrew the filter cup from the filter hous-ing. NOTICE: Be careful not to twist thewater detection switch lead when un-screwing the filter cup. [ECM01960]

1. Water separator-alert indicator 1. Holder

1. Water detection switch coupler

ZMU06286

1


Trouble Recovery

92

6. Drain the water in the filter cup by soakingit up with a rag.

7. Firmly screw the filter cup onto the filterhousing. NOTICE: Be careful not totwist the water detection switch leadwhen screwing the filter cup onto thefilter housing. [ECM01970]

8. Connect the water detection switch cou-pler securely until a click is heard.

9. Fasten the water detection switch leadwith the holder.

10. Install the top cowling.11. Start the engine and make sure that the

water separator-alert indicator remainsoff. Have a Yamaha dealer inspect theoutboard motor after returning to port.

EMU33501

Treatment of submerged motorIf the outboard motor is submerged, immedi-ately take it to a Yamaha dealer. Otherwisesome corrosion may begin almost immediate-ly. NOTICE: Do not attempt to run the out-board motor until it has been completelyinspected. [ECM00401]

1. Filter cup2. Water detection switch lead

1. Water detection switch coupler

ZMU06287

1

1. Holder


YAMAHA MOTOR CO., LTD.

Printed on recycled paperPrinted in JapanApril 2010–0.1 × 1 CR


6br-28199-23 (1)

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