Generac Automobile Parts MAX 12CV User Manual

It is of vital importance, before attempting to  
operate your engine, to read the general  
'SAFETY INSTRUCTIONS AND WARNINGS'  
section on pages 2-5 of this booklet and to strictly  
adhere to the advice contained therein.  
Also, please study the entire contents of this  
instruction manual, so as to familiarize yourself  
with the controls and other features of the  
engine.  
Keep these instructions in a safe place so that  
you may readily refer to them whenever  
necessary.  
It is suggested that any instructions supplied  
with the vehicle, radio control equipment, etc.,  
are accessible for checking at the same time.  
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CONTENTS  
SAFETY INSTRUCTIONS AND  
WARNINGS ABOUT YOUR O.S. ENGINE  
16  
16~17  
17~18  
IF THE ENGINE FAILS TO START  
FINAL ADJUSTMENT  
2
~
5
6
8
9
INTRODUCTION, BASIC ENGINE PARTS  
INSTALLATION  
CARBURETTOR CLEANLINESS  
7
~
~
19  
CARE AND MAINTENANCE  
AIR CLEANER TYPE102  
8
EXPLODED VIEW &  
ENGINE PARTS LIST  
NOTES CONCERNING  
THE RECOIL STARTER  
20~23  
24~25  
9~10  
CARBURETOR EXPLODED VIEW  
& PARTS LIST  
10~11  
GLOWPLUG  
11~12  
TOOLS, ACCESSORIES, etc.  
O.S. GENUINE PARTS &  
ACCESSORIES  
26  
27  
CARBURETTOR CONTROLS  
PRESSURIZED FUEL SYSTEM  
12~13  
13  
THREE VIEW DRAWING  
STARTING THE ENGINE &  
RUNNING-IN('Breaking-in)  
14~15  
1
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SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O.S. ENGINE  
Remember that your engine is not a "toy", but a highly efficient internal-  
combustion machine whose power is capable of harming you, or others, if it is  
misused.  
As owner, you, alone, are responsible for the safe operation of your engine, so act  
with discretion and care at all times.  
If at some future date, your O.S. engine is acquired by another person, we would  
respectfully request that these instructions are also passed on to its new owner.  
The advice which follows applies basically to ALL MODEL ENGINES and is  
grouped under two headings according to the degree of damage or danger  
which might arise through misuse or neglect.  
WARNINGS  
NOTES  
These cover the many other  
possibilities, generally less obvious  
sources of danger, but which, under  
certain circumstances, may also  
cause damage or injury.  
These cover events which  
might involve serious (in  
extreme circumstances, even  
fatal) injury.  
2
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WARNINGS  
Never operate your engine in an en-  
closed space. Model engines, like  
automobile engines, exhaust deadly  
carbon-monoxide. Run your engine  
only in an open area.  
Model engine fuel is poi-  
sonous. Do not allow it to  
come into contact with the  
eyes or mouth. Always  
store it in a clearly marked  
container and out of the  
reach of children.  
Model engines generate  
considerable heat. Do not  
touch any part of your  
engine until it has cooled.  
Contact with the muffler  
(silencer), cylinder head  
or exhaust header pipe, in  
particular, may result in a  
serious burn.  
Model engine fuel is also  
highly flammable. Keep it  
away from open flame,  
excessive heat, sources of  
sparks, or anything else  
whichmightigniteit. Donot  
smoke or allow anyone else  
to smoke, near to it.  
3
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NOTES  
This engine is intended for model cars.  
Do not attempt to use it for any other  
purpose.  
• The wearing of safety glasses is also  
strongly recommended.  
Take care that the glowplug clip or  
battery leads do not come into contact  
with rotating parts. Also check that the  
linkage to the throttle arm is secure.  
Mount the engine in your model  
securely, following the manufacturers'  
recommendations, using appropriate  
screws and locknuts.  
For their safety, keep all onlookers  
(especially small children) well back  
(at least 20 feet or 6 meters) when  
preparing your model for running.  
• Fit an effective silencer (muffler).  
Frequent close exposure to a noisy  
exhaust (especially in the case of the  
most powerful highspeed engines)  
may eventually impair your hearing  
and such noise is also likely to cause  
annoyance to others over a wide area.  
4
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NOTES  
To stop the engine, fully retard the  
Pull the operating handle straight out  
when starting the engine, so that the  
cord does not rub against the vehicle  
body or engine. This will help prevent  
the cord from being damaged by  
abrasion or engine heat.  
throttle stick and trim lever on the  
trans-mitter, or, in an emergency, cut  
off the fuel supply by pinching the fuel  
delivery tube from the tank.  
• Do not attempt to disassemble the  
recoil starter of the 15CV-X.  
Warning! Immediately after a glowplug-  
ignition engine has been run and is still  
warm, conditions sometimes exist  
whereby it is just possible for the engine  
to abruptly restart if it is rotated over  
compression WITHOUT the glowplug  
battery being reconnected.  
If you do so, the very strong spring  
inside will be suddenly ejected. This  
can be very dangerous.  
• Do not extend the starter cord more  
than 45cm (18"). Do not abruptly  
release the operating handle. Allow  
the cord to rewind smoothly while  
still holding the handle.  
5
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The MAX-12CV and MAX-12CV-X are  
high-performance engines for 1/10  
class R/C racing cars. The MAX-12CV-X  
is equipped with a built-in recoil starter  
system which eliminates the need for a  
separate electric and starter battery.  
BASIC ENGINE PARTS  
Heatsink Head  
Carburetor  
Starter Handle  
NOTE:  
With this engine, the piston will feel tight at  
the top of its stroke when the engine is cold.  
This is normal. The piston and cylinder are  
designed to achieve a perfect running  
clearance when they reach their normal  
running temperatures.  
INSTALLING THE GLOWPLUG  
Fit washer to glowplug and  
insert carefully into cylinder-  
head, making sure that it is  
not cross-threaded  
Recoil Starter  
Assembly No.5  
Beam Mount  
Crankcase  
Drive Hub  
before tightening firmly.  
Glow plug  
Crankshaft  
MAX-12CV-X  
Washer  
6
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Avoid forcing the screws. Secure with locknuts.  
If the bottom of the recoil starter housing would  
otherwise touch the car chassis, fit the engine  
mount spacers (supplied) between the engine's  
mounting lugs and the engine mount. Use the  
M3x15 screws provided. With some vehicles, it  
may be necessary to make minor trimming  
modifications to chassis or body when fitting the  
engine.  
ENGINE INSTALLATION  
Make sure that the vehicle's engine mounting  
surfaces are level and in the same plane. Poor  
installation may cause distortion of the  
crankcase, bearings, etc., resulting in erratic  
running and loss of performance.  
The recommended screws for securing the  
engine are 3mm or 4-40 steel Allen hexagon  
socket type.  
If existing holes in the engine mount do not align  
perfectly with engine mounting lugs, enlarge  
them slightly with a needle-file so that screws  
enter vertically.  
NOTE:  
Where spacers are supplied joined in pairs  
(see sketch) separate them as shown.  
Either face may be placed downwards.  
Mount Spacer  
Separate  
Chassis  
Chamfer inside edges of bearers.  
Engine Mount  
Engine Mount Spacer  
7
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AIR CLEANER TYPE 102  
This is a heavy-duty wet type air cleaner that has  
been developed specifically for the O.S. MAX-CV  
series model car engines.  
It contains specially impregnated filter elements which  
prevent highly damaging dust and dirt from being  
drawn into the engine through the carburetor, yet  
allow engine performance to be maintained for longer  
periods between element renewals. The Type 102 air  
cleaner has a special rubber body which facilitates  
easy yet secure fitting, with positive sealing at the  
carburetor air intake.  
INSTALLATION OF THE CARBURETOR  
As delivered, the engine has its carburetor  
lightly fit into the intake boss. Secure it as  
follows.  
1. Loosen the retainer screw, rotate the  
carburetor to its correct position and make  
sure that it is pressed well down into the  
intake boss, compressing the rubber gasket,  
before retightening screw.  
Rotate the retainer screw gently until it  
stops, then tighten a further 60-90˚.  
Do not overtighten the screw as this will  
damage the carburetor body.  
2.  
INSTALLATION OF AIR CLEANER  
Carefully clean the carburetor,  
removing any old adhesive or  
sealant that may have been  
previously used on the outside  
of the air intake.  
Rotate the retainer nut  
gently until it stops.  
Tighten a further 60-90˚  
Press the air cleaner body firmly  
over the carburetor air intake. Make sure that the  
outer rim of the air intake engages the internal  
annular groove in the air cleaner: failure to do so  
may result in the air cleaner falling off. See sketch,  
right.  
ー8ー  
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Position the air cleaner correctly, so that it does not  
foul the cylinder-head or obstruct the needle-valve.  
Always remove contaminated elements carefully, to  
ensure that dirt cannot enter the carburettor.  
AIR CLEANER ELEMENTS  
NOTES CONCERNING THE RECOIL STARTER  
Replacement elements  
arealreadyimpregnated  
with filter oil. As this oil is  
very sticky, take cere,  
whenhandlingelements  
to prevent dust or dirt  
from adhering to them. If  
your fingers become  
Upper Filter  
Element  
Lower Filter  
Element  
( 12CV-X ONLY)  
REMINDER!  
Do not attempt to disassemble the recoil  
starter. If you do so, the very strong  
spring inside will be suddenly ejected.  
This can be very dangerous.  
Insert beneath flanges.  
Do not extend the starter cord more than  
45cm(18"). Do not abruptly release the  
operating handle. Allow the cord to rewind  
smoothly while still holding the handle.  
Pull the operating handle straight out  
when starting the engine, so that the cord  
does not rub against the vehicle body or  
engine.  
contaminated, wash them with soap and water.  
During storage, the oil may have become unevenly  
dispersed through the elements. This will be indicated  
if the blue colour of the element material appears  
patchy. In this case, place the elements in a small  
plastic bag and gently rub them between finger and  
thumb to redistribute the oil.  
REPLACEMENT OF ELEMENTS  
This will help prevent the cord from being  
damaged by abrasion or engine heat.  
It is advisable to replace the upper filter element with  
a new one after not more than one hour of running  
time. It is not necessary to discard the lower element  
as frequently, but be sure to change it when it  
becomes soiled.  
Try to avoid spilling fuel over the starter  
unit and its cord. Some fuels have a  
detrimental effect on these parts.  
9
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The role of the glowplug  
The starter prevents the engine from being  
rotated in the wrong direction.The unit will  
be damaged if you attempt to force the  
flywheel in the opposite direction (i.e.  
clockwisewhenviewedfromthecrankshaft  
With a glowplug engine, ignition is initiated by the  
application of a 1.5-volt power source. When the  
battery is disconnected, the heat retained within the  
combustion chamber remains sufficient to keep the  
plug filament glowing, thereby continuing to keep the  
engine running. Ignition timing is 'automatic' : under  
reduced load, allowing higher rpm, the plug becomes  
hotter and, appropriately, fires the fuel/air charge  
earlier; conversely, at reduced rpm, the plug become  
cooler and ignition is retarded.  
NOTE:  
Because, in the interests of personal safety,  
dismantling of the starter mechanism is  
strongly discouraged, the Recoil Starter is  
available for replacement only as a pre-  
assembled unit.  
Glowplug life  
Particularly in the case of very high performance  
engines, glowplugs must be regarded as expendable  
However, plug life can be extended and engine  
performance maintained by careful use, i.e.:  
However, some related parts, such as  
Starting Shaft and Rear Adaptor, are  
obtainable separately. (See Parts List.)  
Install a plug suitable for the engine.  
GLOWPLUG  
Use fuel containing a moderate percentage of  
nitromethane unless more is essential for racing  
events.  
Since the compatibility of glowplug and fuel may have  
a marked effect on performance and reliability, it may  
be worthwhile to choose the R/C type plug found  
most suitable after tests.Recommended O.S. plugs  
are A3, A5 and No8. Carefully fit plug finger-tight,  
before final tightening with the correct size plug  
wrench.  
Do not run the engine too lean and do not leave the  
battery connected while adjusting the needle.  
10  
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When to replace the glowplug  
As a starting point, we recommend a fuel containing 10-  
20% nitromethane, changing to a fuel containing more  
nitro only if necessary. When the nitro content of the fuel  
isincreasedorthebrandoffuelischanged,itisadvisable  
to initially run the engine with a richer needle-valve  
setting, so that the optimum setting for the new fuel may  
be rechecked as described in the RUNNING-IN  
paragraphs. When engines are run at very high speeds  
and on high-nitro fuels, glowplug elements do not last  
so long.  
Apart from when actually burned out, a plug may  
need to be replaced because it no longer delivers its  
best performance, such as when:  
Filament surface has roughened and turned white.  
Filament coil has become distorted.  
Foreign matter has adhered to filament or plug  
body has corroded.  
Engine tends to cut out when idling.  
Starting qualities deteriorate.  
Rem inder!  
Model engine fuel is poisonous. Do not  
allow it to come into contact with the eyes or  
mouth. Always store it in a clearly marked  
container and out of the reach of children.  
TOOLS, ACCESSORIES, etc.  
The following items are necessary for operating the  
engine.  
FUEL  
Model engine fuel is also highly flammable.  
Keep it away from open flame, excessive heat,  
sources of sparks, or anything else which  
might ignite it.  
Use only top quality methanol-based model engine  
fuel.For consistent performance and long engine life,  
it is advisable to use fuel containing AT LEAST 18%  
lubricant.Thisengineisdesignedtorunonbothlowand  
high nitromethane content fuels,i.e. from mild mixtures  
containing a few percent of nitromethane, up to high-  
speed racing fuels containing 40% nitromethane.  
Generally,poweroutputisincreased-uptoacertainpoint-  
as the nitromethane content of the fuelis increased.  
BATTERY INTEGRATED GLOWPLUG HEATER  
Commercialy available handy  
glowplug heater in which the  
glowplug battery and battery  
leads are integrated.  
11  
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ELECTRIC STARTER AND STARTER BATTERY  
Use an electric starter with 12-volt  
battery for starting the MAX-12CV.  
(
)
CARBURETOR CONTROLS 10C  
Three adjustable controls are provided on this  
carburetor.  
¡
The Needle-Valve:  
For adjusting the mixture strength when the throttle  
LONG SOCKET WRENCH  
is fully open.  
¡
Recommended for easy removal  
and replacement of the angled  
and recessed glowplug, the  
O.S.Long Socket Wrench  
incorporates a special grip.  
The Mixture Control Screw:  
For adjusting the mixture strength at part-  
throttle and idling speeds, to obtain steady  
idling and smooth acceleration to mid speeds.  
¡
The Throttle Stop Screw:  
For setting the minimum idling speed.  
FUEL BOTTLE OR PUMP  
NOTE:  
Needle Valve  
Ball Link  
For filling the fuel tank, a simple,  
polyethylene "squeeze" bottle,  
with a suitable spout, is required.  
Readjustment may  
be necessary, occa-  
sionally to allow for  
changes in fuel for-  
mulae, gear ratio or  
clutch engagement  
SILICONE TUBING  
Heatproof silicone tube of approx.  
5mm o.d. and 2mm i.d. is required  
for the connection between the fuel  
tank and engine.  
Throttle  
Stop Screw  
point.  
Mixture Control Valve  
Assembly Screw  
12  
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(
)
CARBURETOR CONTROLS 10E-R  
PRESSURIZED FUEL SYSTEM  
The somewhat violent changes of vehicle attitude  
Three adjustable controls are provided on this  
carburetor.  
that occur in off-road running, combined with the  
fact that, in buggy type cars, the fuel tank is often  
located some distance from the carburetor, means  
that fuel 'head' at the carburetor can vary and upset  
running.Therefore,it is recommended that a muffler  
pressurized fuel feed system be used.  
¡
The Needle-Valve:  
For adjusting the mixture strength when the throttle  
is fully open.  
¡
The Mixture Control Screw:  
For adjusting the mixture strength at part-  
throttle and idling speeds, to obtain steady  
idling and smooth acceleration to mid speeds.  
Never run your vehicle without fitting the air cleaner.  
Dust and dirt that may otherwise be drawn into the  
engine will rapidly shorten its life.  
¡
The Throttle Stop Screw:  
For setting the minimum idling speed:  
Connect suitable length of  
Fuel Tank  
Silicone tubing between fuel  
tank and silencer.  
NOTE:  
Readjustment may  
Needle Valve  
Silicone tube  
be necessary, occa-  
sionally to allow for  
changes in fuel for-  
mula, gear ratio or Throttle  
Stop Screw  
clutch engagement  
point.  
Silencer  
Mixture Control Valve  
Assembly Screw  
13  
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STARTING THE ENGINE & RUNNING-IN ('Breaking-in')  
The following procedure is suitable for these engines  
when the O.S. T-1020 tuned silencer and a fuel  
containing up to 30% nitromethane are used.  
In case of the 10E-R caburettor  
approx 1mm  
Set the throttle-stop screw so  
that the minimum throttle  
opening (idle setting) is  
approximately 1.0mm.  
Use the same fuel as is to be employed for all initial  
running and containing NOT LESS THAN 18%  
lubricant.  
DO NOT energize glowplug,  
but apply electric starter to  
draw fuel to carburettor.  
Throttle Stop Screw  
Front  
Temporarily remove the glowplug to check that it  
glows bright red when energized.  
Re-check the needle-valve  
Now connect glowplug battery  
lead to heat the plug filament  
and start the engine.  
Close  
Rear  
and throttle settings. Turn  
the needle-valve clockwise  
slowly and gently until it  
stops. This is the fully  
Rotating  
Direction  
In case of the 12CV-X  
Open  
Needle Valve  
closed position.Do not use  
Push the choke button on  
force to turn the needle-valve beyond this point.  
Open the Needle-Valve 2 turns from the fully closed  
position.  
the fuel tank several times  
to deliver the fuel to the  
carburetor. (Do not over-  
prime or the recoil starter  
cannot be pulled.)  
Approx. 0.3-0.5mm  
In case of the 10C caburettor  
Switch on the transmitter and  
receiver and set the throttle  
very slightly opened from the  
idling position.  
Pull the starter handle  
briskly straight out several  
times to start the engine.  
Starter Handle  
14  
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Remember!  
Repeat this procedure until 5 more tanks of fuel have  
been consumed, during which time the throttle may  
be opened for brief bursts of increased power. If the  
engine stops at medium speeds, close the Mixture  
Screw 45-90˚.  
It is vitally important to set the  
throttle at the correct position  
before attempting to start the  
engine.If the engine is  
allowed to run with the  
throttle too far open under  
"no load" conditions, it will  
rapidly overheat and may be seriously damaged.  
The position of the needle-valve  
when starting the engine.  
Needle  
Close the needle-valve approx.  
30˚ after running the vehicle for  
one full tank of fuel.  
Repeat this procedure several  
times.  
Whentheenginestarts, firstallowittooperateinshort  
runsattheveryrichstartingsettings,withtheglowplug  
batterystillconnectedandwithitsdrivingwheelsclear  
of the ground.The rich mixture will, under these  
conditions, provide adequate lubrication and cooling,  
indicated by profuse smoke from the exhaust.  
To stop the engine, close the throttle to idling speed,  
then shut it off completely with the trim lever on the  
transmitter. To cut off the fuel supply, pinch the fuel  
delivery tube to the carburetor.  
Next, disconnect the glowplug battery and try  
Remember!  
running the car on the track. If the engine stalls, open  
the throttle fractionally, but try to keep the engine  
running as rich as possible: if it stops because of  
being excessively over-rich, close the Needle-Valve  
30˚ and try again.  
If the engine should need to be disassembled (e.g.  
for cleaning or minor parts replacement) it is  
advisable to return the Needle-Valve to the original  
rich, starting setting and check whether further  
running-in time is required before the car is raced  
again. In the event of any major working parts (e,g,  
piston/cylinder liner assembly) being replaced, the  
complete running-in should be repeated.  
Run the car on the track until one tank of fuel has been  
consumed, then close the Needle-Valve 30˚ and run  
the car for another full tank of fuel.  
15  
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FINAL ADJUSTMENT  
IF THE ENGINE FAILS TO START  
Check the following:  
Run the vehicle (with throttle fully open) over the  
longest available straight course, in order to observe  
the model's speed. Next return the car to the starting  
point, close the Needle-Valve 30˚ and repeat the  
run, taking note of the improvement in performance.  
Continue with further runs, gradually reducing the  
Needle-Valve setting and aiming to achieve the  
highest straight-line speed. Remember, however,  
that, if the Needle-Valve is shut down too far, the  
engine will overheat and, accompanied by visibly  
diminished exhaust smoke, the model will lose  
speed. At this point, throttle down immediately, stop  
the vehicle and reopen the Needle-Valve 30˚.  
Glowplug battery discharged or glowplug defunct.  
Fuel not reaching carburetor.  
Engine flooded. Do not over-prime. (This could also  
cause hydraulic lock and damage the engine on  
application of the electric starter.)  
Remove glowplug, close needle-valve and apply  
starter to pump out surplus fuel. At this time cover  
the plug hole with a rag so that splashing fuel will  
not get into your eyes or mouth.  
MAX-12CV-X  
Having established the optimum Needle-Valve  
setting, check the Mixture Control Valve setting as  
follows.  
With the engine running, close the throttle and allow  
it to idle for about five seconds, then reopen the  
throttle fully. If, at this point, the engine puffs out an  
excessive amount of smoke and the vehicle does  
not accelerate smoothly and rapidly, it is probable  
that the idling mixture is too rich.  
16  
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In this case, turn the Mixture Control Valve  
clockwise 45~90˚. If, on the other hand, the engine  
tends to speed up momentarily and then cut out  
abruptly when the throttle is opened,the idling  
mixture is too lean. Correct this by turning the  
Mixture Control Valve counter-clockwise 45~90˚.  
With the optimum mixture control position, light  
smoke is visible during high speed running,and the  
engine revolutions increase smoothly during  
acceleration. Remember that, if the engine is  
operated with the fuel/air mixture slightly too lean, it  
will overheat and run unevenly. As with all engines,  
it is advisable to set both needle-valve and mixture  
control screw very slightly on the rich side of the best  
rpm setting, as a safety measure.  
NOTE:  
Mixture Control Valve adjustment should be made  
in steps of not more than 45~90˚, carefully  
checking the effect,on throttle response, of each  
small adjustment.  
If the engine runs too fast with the throttle closed,  
the throttle stop screw should be turned counter-  
clockwise to allow the throttle opening to be  
reduced.  
Carry out adjustments patiently, under actual  
running conditions, until the engine responds  
quickly and positively to the throttle control.  
Finally, beyond the nominal break-in period, a slight  
readjustment toward a leaner needle setting may be  
required to maintain performance.  
Warning!  
Mixture adjustments (whether via the Mixture  
Control Valve, or the Needle-Valve) cannot be  
made accurately under 'no-load' conditions,  
which, in any case, are not advised, since such  
operation carries the risk of seriously damaging  
the engine through over-revving and overheating.  
CARBURETOR CLEANLINESS  
The correct functioning of the carburetor depends on  
its small fuel orifices remaining clear.  
(See Care and Maintenance section on Page19.)  
17  
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In case of the 10C caburetor  
BALL LINK AND SLIDE VALVE EXTENSION  
(In case of the 10C caburetor)  
First rotate the Mixture Control  
It is seldom necessary to separate the slide-valve  
extension from the slide-valve itself. For cleaning,  
withdraw this complete sub-assembly from the  
carburetor body after removing the slide-valve guide  
screw. Then wash with methanol or glow-fuel.  
(Note: take care not to lose the guide screw;it is a  
special one.)  
Valve until its slotted head is  
flush with the carburetor body.  
Then screw the valve in exactly  
2.5 turn.  
This is the standard position.  
When it is necessary to adjust the ball-link position,  
loosen the ball-link retaining screw with a 2.5mm  
hexagon key, re-align the ball-link and re-tughten the  
screw firmly.  
Mixture Control Valve  
Carburettor Body  
In case of the 10E-R caburetor  
REALIGNMENT OF MIXTURE CONTROL VALVE  
First rotate the Mixture Control  
Throttle Lever  
In the course of making carburetor adjustments, it is  
just possible that the Mixture Control Valve may be  
inadvertently screwed in or out too far and thereby  
moved beyond its effective adjustment range.Its basic  
position can be found by first rotating the Mixture  
Control Valve until its slotted head is flush with the  
carburetor body. The valve is then screwed in exactly  
2.5 turn to re-establish its neutral position.  
Valve until its slotted head is  
flush with the carburetor body.  
Then screw the valve in  
exactly 0.5 turn.  
This is the standard position.  
Mixture Control Valve  
Carburettor Body  
18  
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Then, inject some after-run oil into the engine, and  
rotate the engine with an electric starter for 4 to 5  
seconds to distribute the oil to all the working  
parts.  
4.  
CARE AND MAINTENANCE  
1.  
The minute particles of foreign matter, that are  
present in any fuel may, by accumulating and  
partially obstructing fuel flow, cause engine  
performance to become erratic and unreliable.  
O.S. 'Super-Filters' (large and small) are available,  
as optional extras, to deal with this problem.  
Note:  
Do not inject after-run oil into the carburetor as  
this may cause the O-rings inside the carburetor  
to deteriorate. These procedures will reduce the  
risks of starting difficulties or corrosion after a  
period of storage.  
One of these filters, fitted to the outlet tube inside  
your refueling container, will prevent the entry of  
foreign material into the fuel tank. It is also  
recommended that a good in-line filter be installed  
between the tank and carburetor.  
Finally, when cleaning the exterior of the engine,  
use methanol or kerosene. Do not use gasoline or  
any solvent that might damage the silicone fuel  
tubing.  
5.  
Do not forget to clean the filters regularly to remove  
dirt and lint that accumulate on the filter screens.  
Also, clean the carburetor itself occasionally.  
2.  
3.  
Caution:  
The rear crankshaft bearing of this engine uses a  
special plastic retainer. If the front housing needs  
to be heated to remove or replace the bearing, do  
not allow the bearing to exceed 120˚C (248˚F),  
otherwise it may be damaged and rendered  
unserviceable.  
At the end of each operating session, drain out any  
fuel that may remain in the fuel tank.  
Afterwards,energize the glow-plug and try to restart  
the engine, to burn off any fuel that may remain  
inside the engine. Repeat this procedure until the  
engine fails to fire. Do this while the engine is still  
warm.  
19  
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MAX-12CV EXPLODED VIEW  
C.M2.6x12  
2
1
t
e
3
C.M2.6x7  
4
6
5
r
w
8
q
7
=
-
0
9
Type of screw C Cap Screw M Oval Fillister-Head Screw  
F
Flat Head Screw N Round Head Screw S Set Screw  
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MAX-12CV ENGINE PARTS LIST  
Description  
No.  
Code No.  
(
)
2 1404 300  
Heatsink Head RED  
(
)
2 1404 310 Heatsink Head GREY  
1
(
)
2 1404 320 Heatsink Head BLUE  
(
)
2 1404 330  
Heatsink Head NATURAL  
(
)
2 1404 000 12CV Machine Head GOLD  
2
3
4
5
6
7
8
9
0
-
2 1203 011  
Cylinder & Piston Assembly  
2 1206 000 Piston Pin  
2 1205 040 Connecting Rod  
(
)
2 1286 000 Carburettor Complete Type 10C  
(
)
2 1481 020 Carburettor Complete Type 10E-R  
2 1481 700 Carburettor Retainer  
2 0810 007  
Propeller Nut  
2 1408 000 Drive Hub  
2 2631 019  
(
)
Crankshaft Ball Bearing Front  
(
)
2 1401 000 Crankcase RED  
(
)
2 1401 010 Crankcase GREY  
=
(
)
2 1401 020 Crankcase BLUE  
(
)
Crankcase NATURAL  
2 1401 030  
(
)
2 1230 000 Crankshaft Ball Bearing Rear  
q
w
e
2 1202 010  
2 1214 000  
2 1407 000  
Crankshaft  
Gasket Set  
(
)
Cover Plate RED  
(
)
2 1407 010 Cover Plate GREY  
r
t
(
)
2 1407 030 Cover Plate NATURAL  
2 1213 000  
Screw Set  
7 1605 300 Glow Plug A3  
7 2403 200 Super Air Cleaner 102 W/3 filter elements  
(
)
102 Cleaner Body  
101,102 Filter Elements 6pcs.  
7 2403 210  
7 2403 120  
(
)
The specifications are subject to alteration for improvement without notice.  
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MAX-12CV-X EXPLODED VIEW  
C.M2.6x12  
2
1
e
3
y
4
6
5
M.M2.6x7  
w
8
q
7
=
-
0
9
u-1  
u-2  
M.M2.6x7  
u
t
r
Type of screw C Cap Screw M Oval Fillister-Head Screw  
F
Flat Head Screw N Round Head Screw S Set Screw  
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MAX-12CV-X ENGINE PARTS LIST  
Description  
)
No.  
Code No.  
2 1404 300  
(
Heatsink Head RED  
(
)
2 1404 310 Heatsink Head GREY  
1
(
)
2 1404 320 Heatsink Head BLUE  
(
Heatsink Head NATURAL  
)
2 1404 330  
(
)
2
3
4
5
6
7
8
9
0
-
2 1404 000 12CV Machine Head GOLD  
2 1203 011  
2 1206 000 Piston Pin  
Cylinder & Piston Assembly  
2 1205 040 Connecting Rod  
(
)
2 1286 000 Carburettor Complete Type 10C  
(
)
2 1481 020 Carburettor Complete Type 10E-R  
2 1481 700 Carburettor Retainer  
2 0810 007  
Propeller Nut  
2 1408 000 Drive Hub  
2 2631 019  
(
Crankshaft Ball Bearing Front  
)
(
)
2 1401 000 Crankcase RED  
(
)
2 1401 010 Crankcase GREY  
=
(
)
2 1401 020 Crankcase BLUE  
(
Crankcase NATURAL  
)
2 1401 030  
(
)
q
w
e
r
t
y
u
2 1230 000 Crankshaft Ball Bearing Rear  
2 1202 000 Crankshaft  
2 1214 000 Gasket Set  
Starting Shaft  
2 1421 200  
2 1421 100 Rear Adaptor  
Screw Set  
2 1313 030  
7 3003 000  
7 3003 100  
7 3003 200  
7 2404 000  
No.5 Recoil Starter Assembly  
No.5 Recoil Starter Body  
No.5 One-way Clutch  
Engine Mount Spacer  
u-1  
u-2  
7 1605 300 Glow Plug A3  
7 2403 200 Super Air Cleaner 102 W/3 filter elements  
(
)
102 Cleaner Body  
(
101,102 Filter Elements 6pcs.  
7 2403 210  
7 2403 120  
)
The specifications are subject to alteration for improvement without notice.  
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10C CARBURETOR EXPLODED VIEW & PARTS LIST  
No.  
Description  
Mixture Control Valve Assembly  
"O" Ring(L) (2pcs.)  
Code No.  
3-1  
2 1285 600  
1
2
3
1-1 4 6066 319  
2 2781 800  
2 1285 640  
"O" Ring(S) (2pcs.)  
1-2  
2
Throttle Stop Screw  
2 1285 901 Needle Valve Assembly  
3
4
2 7881 820  
2 1286 100  
2 1285 220  
2 1286 200  
2 1286 400  
2 1881 320  
3-1  
4
"O" Ring (2pcs.)  
Carburetor Body  
5
1-1  
1-2  
5
Slide Valve Guide Screw  
Slide Valve  
1
6
Metering Needle Assembly  
Dust Cover  
6
7
C.M3.5x8  
8
0
7
9
2 3818 420 Ball Link No.4  
2 2615 000  
0
Carburettor Rubber Gasket  
8
The specifications are subject to alteration for improvement  
without notice.  
9
Type of screw  
C
Cap Screw M Oval Fillister-Head Screw  
F
Flat Head Screw N Round Head Screw S Set Screw  
24  
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10E-R CARBURETOR EXPLODED VIEW & PARTS LIST  
No.  
Description  
Mixture Control Screw  
"O" Ring (2pcs.)  
Code No.  
1
2 1481 600  
0-1  
1-1  
2
2 7881 820  
2 1481 420  
2 2681 419  
2 1283 210  
2 1481 200  
2 2481 506  
2 1283 962  
2 4881 824  
2 1283 961  
2 1481 120  
2 2681 310  
2 1481 900  
2 7881 820  
2 1481 950  
0
9
Throttle Lever Fixing Nut  
3
Throttle Lever  
Dust Cover  
4
6
0-2  
5
Carburetor Rotor  
Rotor Spring  
6
8
7
Nozzle Assembly  
"O" Ring  
7-1  
7-1  
7-2  
8
Locknut  
-
7-2  
Carburetor Body  
Throttle Stop Screw  
Needle Valve Assembly  
7
9
0
1-1  
0-1  
0-2  
-
2
"O" Ring (2pcs.)  
Fuel Inlet  
1
3
2 2615 000 Carburetor Rubber Gasket  
4
The specifications are subject to alteration for improvement  
without notice.  
5
25  
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O.S. GENUINE PARTS & ACCESSORIES  
RACING ENGINE PARTS  
Exhaust Header Pipes  
12CV  
O.S. Glow Plug  
10C Automatic  
Carburettor  
(21286000)  
No.8  
Machine Head  
BLUE (72001110)  
For Kyosho Super10  
For Tamiya TGX  
(71608001)  
(72103120)  
(72103110)  
A3  
For Tamiya TG10  
(72001100)  
For Kyosho V-ONE R,S  
RED  
(71605300)  
(72103130)  
(72103160)  
A5  
(71605100)  
For Kyosho Spider &  
HPI Nitro (72103140)  
Super Air Cleaner 102S  
(72403202)  
For Mugen MTX  
101,102 Filter Elements  
(72103150)  
(6pcs.)  
(72403120)  
T-1020  
Tuned Silencer  
Super Joint Tube 15  
(72103310)  
Long Socket Wrench  
With Plug Grip  
Dust Cap Set  
φ
3
(73300305)  
For Carburettor Nipple  
(71521000)  
(72103020)  
φ
7
(73300712)  
For T-1020 Tuned  
Silencer  
Crankshaft Clamp  
1012  
φ
10  
(73301012)  
For 10C,10E-R  
Carburettor  
(71530100)  
26  
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12CV,12CV-X THREE VIEW DRAWING Dimensions(mm)  
38  
SPECIFICATIONS  
11  
35.5  
Displacement  
Bore  
2.11 cc(0.129cu.in.)  
14.0 mm(0.551in.)  
Stroke  
13.7 mm(0.539in.)  
Practical R.P.M.  
Power output  
Weight  
3,000~30,000 r.p.m.  
0.56 bhp / 29,000 r.p.m.  
211g(7.45oz.)12CV  
M5x0.8  
269g(9.50oz.)12CV-X  
190g(6.70oz)12CV Hyper  
248g(8.75oz)12CV-X Hyper  
27.5  
41  
33.5(17.6)  
90.6(74.6)  
25  
39  
40  
( )-12CV  
27  
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MEMO  
28  
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R
D
6-15 3-Chome Imagawa Higashisumiyoshi-ku  
Osaka 546-0003, Japan  
TEL. (06) 6702-0225  
FAX. (06) 6704-2722  
C
Copyright 2000 by O.S.Engines Mfg. Co., Ltd. All rights reserved. Printed in Japan.  
120104  
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