Thank you for purchasing a Mac Minarellp engine, one of].1-1_l'L""t

gasotine engines a\raitabte. Wirh oui 3_yearwarranty and customer support, we.are sure that you wiil bevery happy with your purchase. For those of you-who havehad gasoline engines, some ol what *" t uue to ,""orrn"nJr"y. l9t b9 new; but, it is important that you take the time tol"?d. lh" instruciions. Following these lnstructions shouldprovide you with a sale and long running engine.

Warning: Before you a,ttempl to run this engine Read Thishstruction Manual in lts Entirety.f

. This is nol a toy. lt is a high-quality, strong runnino enoineand ls sate when you opemte it in the manner for-whiih itwas designed.

RECOMMENDED PROPELLER SIZES:7O@: 20 x 12, 22 x 10, 24 x 1085cc: 24 x 12,26 x 10,26 x 12125cc:28 x 10, gO x 10, 92 x 10

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ORIGINALSCREW

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. l/ake sure that when you startweafing any oose clothiri0,*6Xi&shirl pockets, or are using a radio neck_strapl f"f"f." irlrnar when you are runn;ng the enginb, ali people arestanding behind ,the engine-out of tne-l;ne'of tn6 prJpef fei. engine.

'!.. This engine was specifically designed to be used in model

arrcrafi. Do not use it for any other purpose.

. NEVERrestrained.

...f t .,. Wei recommend that only high quality pro(

start the engine without.the aircraft being

products and., accessories be used with your engine.

. lt is important that you install both an odernal and sen/ooperated kill switch.

. Do not pressurize the fuelsystem as this mighl cause a fire.

. Never use your bare hands to starl these enqines. Alwavswear a leather glove or use an electric startei

PACKING LIST1-Mac Minarelli twin engine2-€park plugs1-Coil with ignition leads .

1-Control box1-Quick Start unit

5. lnstall the included fiberglass throttle lever with the2-56 x 114' screw provided.

6. When you attach the throt e linkage DO NOT use an allmetal.pushrod. Use a threaded rod ai each

"nO of

"itf,"i"flberglass or nylon pushrod. Metal c""tr"f i"O, t""O i"'""rry.engine noise back to the radio equipment and can caus6severe radio interference-

2-56 NUT

1i

INSTALLATION GUIDE

lri?r Jo tltg. acluat insta aiion, there are a few guidetines

that should be followed:

.,1.-To reduqg possible RF interference it is recommended

mar you,maintain 8' _ 12. separation between any of theengrne eomponents and the receiver, seryos ind thereceiver battery pack.

-9.+ia-r5ene+-6+€el-b4f_si1u.rft f tgreejtoffi fr f he.enoine-to me tirewall. The bqfl should scre"w into a blind nut in thefirewall and thread locking compound should be used tJsecure the bolt. NEVER use wood screws to rnou"t-tf,"

3- Use a minimum 1/4" firewall for your engine inslallation.

.4. Check and re-tighten the engine mounting bolts everyfew llights.

MOUNTING THE ENGINE

1. The design ot this engine lends itsell to being mounted

with the carb,-uretor facing downward. We would recommend

that you do this. lt is much easier to avoid flooding the

engine when the carburetor is pointed down'

2.The ignition assembly is located in the rear of the engine'

As such,-it is recom(nended that you drill a 1/2" hole to allow

the ignition wires to'be routed to the control box'

3. Mount the engine to the firewall usin6 8-32 blind nuis and

high quality har,Jenecl steel 8-32 bolts. Use blue thread

locking compound to ensure the bolts are secure'

4. You will need to make spacers to mount the coil' Use

these to mount the coil in a convenient place on the firewall'

Mount the coil away lrom any ol the radio components

5. Crimp a solderless lug to each end of a 14-gauge wire'

cut to tength. Only crimp the lugs and wire- DO .NOT

SOLDER ihem together! The solder is brittle and will

eventually crack and cause the wire connection to break'

resulting in the engine slopping. This could be disastrous

in flight.

6. Using a wood screw, mount the control box to a location

on the firewall that is convenient lor the wiring connections'

7. We recommend thal you have two separate kill switches

- one mounted eldernally on the airplane and the other

internally mounted and activated by a servo' This will give

vou the ability to manually shut off the engine when i! is on

ihe ground or to kill the engine in llight should some

emergency condition require stopping the engine. See the

encloied wiring diagram lor exact installation instruction'

ADDITIONAL PARTS NEEDED FOR INSTALLATION(NOT INCLUDED):2-Spacers for mounting coil2-#6 x 1-1/2i sheet metal screws

2:Solderless lugs1-24' 14-gauge wire lor ground strap and kill switch

1-lgnition s.,r/itch harness (GPMG2150)(bdernal and servo operated kill switches)

ourcKSTART

NOTE: For clarity, the engine is shown upside-down in

the diagram above.

QUICK START INSTALLAf,ION

The Quick Start is a unique device that enables the engine to

be hand started much easier.The unit requires 8 M batteries

(not included) for power. Ohe engine can be started without

in" Qrick St"rt using a high torque electric starter).

To ease the connection of the Quick Start, you may wish to

replace the existing Quick Start connector with a 4-pin

connector. Replace the large white connector on the Quick

Start Box with the male end ol the 4-pin plug' Replace the

while connector on the control box with the female plug' The

4-pin plug can be easily mounted to your airplane and will

prwide easy access lor the Quick Starter Box when you

start the engine.

FUEL

We recommend a high grade 2-cycle oil be mixed with fresh

gasoline tor engine fuel. Use a good 2-cycle oil and mix it at a

atio of 25:1 (5oz.of oilto 1 gallon ot gasoline).We recommend

Klof RC Model Lube (KSFPo310). Always use lresh luel. Do

not use luel that has been stored over the winter'

NEEDLE SETTINGS

1 . The carburetor consists ol two needle valves and an idle

adiusting screw. The low-speed needle valve is marked with

an"f.Tie high-speed needle valve is marked with an'H"'Turning thessneedle valves clockwise will lean the mixture'

Count6rclockwise will richen the mixture' lnitially the setting

should be 1 turn out on the high-speed needle valve and

1-112 turns out on the low-speed needle valve' Start with

these settings.

2. Never try to adtust the needle valves with the engine

running. Always turn the engine oft betore making

adiust-ments' Gasoline carburetors are much more precise

than glow engine5, therelore requiring smaller adjustments

lor proper performance. Avoid making more than a I/8th turn

adjustment to ihe needle valves at a time.

3.The third screw on the side of the carburetor is the idle

stop screw. Double check it to be sure that itis screwed out

far enough to allow you to shut the engine off when you pull

the throttle all the way back.

4.Your engine currently has a spring attached tolhe throttle

to allow it to always return to idle. Disconnect it so that it will

not put a constant load on the servo. However, if you are

bench running the engine, leave the spring connected to

avoid startingiat high throttle. Do not remove the springfrom the engine.

@

PRIMING

1. Betore starting the engine it is a good idea to prime the

enoine. Make srire vou turn off the coil by activating the

Ntt-switcn, or grounding the black and white wire'

2. With the ignition switch off, open the throttle all the way'

close the choke plate and rock the prop back and forth

against compression. This wilt draw fuel into the carbui'etor'

D; this until fuel begins to drip out of the carb'

HAND STARTING

1. Plug the Quick Start into the connector on the airplane'

Depresi the button once on the QuicK Start Box making

sure the red L.E.D. lights.

2. Open the choke plate.Then close the throttle to a setting

ol a last idle. Deactivate the kiil slvitch. Make sure you have

restrained the airplane or have someone hold it' Flip the

prop counterclockwise briskly until the engine starts' ll the

engine does not start after several tlips it is most likely not

priired enough. Repeat the priming procedure until the

engine starls.

ELECTRIC STARTER

ll vou choose to use an electric high torque starter, you do

n& need to use the Ouick Start. Make sure your kill switches

are in the run position (not grounded), set the throttle to a

high idle and spin the prop until it starts'

TUNING

Let the engine wanrFup for approximately 3o-secondsbefore making any adiustments or trying to increase thethrottle. When you do the initial engine tuning set the l6vt-speed be{ore the high-speed.

Low-speed needle adjustment lf the engine coughs orsputters the low-speed needle is loo rich. Lean the low-speed mbdure by turning it in a 1/16 turn at a time until lhesputteiing stops. lf the engine does not accelerate trom idle

. then the low-speed needle is probably lean. Richen the low-speed needle by turning it out a l/16 turn at a time.

Highspeed needle adjustment After you have the low-speed needle set you can tune the high-speed needle. Turnthe high-speed needle in until the engine rpm drops. Fromthat point turn the high-speed screw out until you achieve themaximum sustainable rpm. After reaching maximum rpm,turn lhe high-speed needle out until you see a reduction of50 - 100 rpm.This will ensure that you do not run the enginetoo lean.

After you have the high-speed needle adjusted double-checkthe low-speed needle setting. Note: The mildure screwsoverlap the rpm ranle of your engine. lt may be necessary togo back and forth several tin--es from the low-speed and high-speed mixure screws-

TROUBLE SHOOTING

IF THE ENGINE WILL NOT START

. Check the battery condition of the Quick Start unit (.tOvolts is the cutoff).

. Flip propeller more vigorously. Hint: ll you back the prop 45-degrees off of compression betore flipping, the euick Startwill make a hotter spark.

. The engine is probably not primed enough. Choke theengine until fuel is running out ol the carburetor.

. Check to see it you have a good ground slrap connectionbetween the engine and the coil.

. Check to see il you are getting a spark. procedure:Remove both spark plugs. Attach the spark plug wire to oneof the plugs, turn on the Quick Start unit. Hold the base ofthe plug to the engine casing to ground it. Flip the propellerby hand and see if the plug sparks. lf there is no spark,change spark plugs.

. The engine may be flooded. Remove the plugs and drylhem off before attempting to start once again. AIso, spin theprop vigorously to eject any excess fuel from the cylinders.Pdnted in USA

Mac Minarelli warrants this engine to be free of manufacturingdefects in parts and workmanship tor three years from thedate of purchase, according to the terms b€low.

Hobby SeMces is Mac Minarelli Engines, authorized U.S.repair tacility. Throughout the warranty period, if.you are theengine's original owner, Hobby Services will repair orreplace (as their technicians determine necessary) anydefective parts without charge. ;

To receive repair service under warEnty, you need onlyto provide proof of the date on which you purchasedthe engine. Please save your original purchase invoice orreceipt and include it when sending the engine to HobbyServices for repairs.

This warranty applies only in the USA and Canada. Forwaranty service in other countries, see your local MacMinarelli Engines dealer.

LIMIT OF LIABILIry

Under this warranty, Hobby Services provides all parts andlabor required to repair your engine al no cost to you. youare responsible only for shipping charges.

This warranty does not cover:(1) Normal wear of enoine parts.(2) Using the engine for any purpose other than powering

an appropriate Rl/C model.(3) Damage resulting from a crash, or from misuse, neglector abuse-such as:. Running the engine too lean, with sub-standard tuel, orwith incoffect accessories (spark plug, propeller, etc.);

. Allowing internal and/or external components to corrode;

. Allowing the engine to be disassembled, modified orrepaired by anyone other than Hobby Services.

Should your Mac Minarelli engine require warranty or non-warranty service, please return it via UPS or insuredParcel Post to our national service facility:

Hobby Servicesl610lnterstate Drive

Champaign, lL 61022 USA(214 39&0007

Along with your engine and proof of purchase date, pleaseinclude a complete, written explanation ol the problems youare having with the engine. Be sure to state your name,address and phone number clearly.

For repairs nol covered under warranty, Hobby Services willnotify you by postal mail (or e-mail, if an e-mail address isprovided) of the charges and the payment options available.

MMLZ1OoO O Copyright 1998

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