O.S. Engines 18TM Revo User Manual

18TM w/11K-R & T-Maxx Revo Manifold

MAX-

OWNER'S INSTRUCTION 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.

CONTENTS

SAFETY INSTRUCTIONS AND

WARNINGS ABOUT YOUR O.S. ENGINE...... 2-5

ENGINE CONSTRUCTION........................... 6

NOTES WHEN APPLYING AN ELECTRIC
STARTER

ABOUT THE

................................. 7

ENGINE ......................................

8

FINAL ADJUSTMENT .................... 20-22

CARBURETOR CLEANLINESS ............. 22

CARE AND MAINTENANCE ........................... 23-24

CHECKING THE ENGINE ................. 25

TROUBLE

SHOOTING ......................... 26-29

BEFORE

STARTING .......................................

BASIC

ENGINE

PARTS ....................................

CARBURETOR

FACTS ABOUT GLOWPLUG ........................12

INSTALLATION OF THE CARBURETOR ....... 13

INSTALLATION ..............................................13-16

STARTING THE ENGINE & RUNNING-IN .....17-19

CONTROLS ........................... 11

8-10

10

ENGINE EXPLODED VIEW & PARTS
CARBURETOR EXPLODED VIEW &

PARTS LIST............................. 32-33

O.S. GENUINE PARTS & ACCESSORIES ........... 34

THREE VIEW DRAWING ............................ 35

GUARANTEED TO KEEP YOUR

R/C CAR RUNNING WELL .............. 36-39

LIMITED

WARRANTY............................. 41

LIST.... 30-31

1

SAFETY INSTRUCTIONS AND WARNINGS ABOUTYOUR O.S. ENGINE

Remember that your engine is not a "toy", but a highly efficient internal­combustion 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

These cover events which

might involve serious (in
extreme circumstances, even

fatal) injury.

NOTES

These cover the many other
possibilities, generally less obvious
sources of danger, but which, under
certain circumstances, may also
cause damage or injury.

2

WARNINGS

• 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.

• Model engine fuel is also
highly flammable. Keep it
away from an open flame,
excessive heat, sources of
sparks, or anything else

which might ignite it. Do not
smoke or allow anyone else
to smoke, near to it.

• Never operate your engine in an en­closed space. Model engines, like
automobile engines, exhaust deadly
carbon-monoxide. Run your engine
only in an open area.

•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.

3

NOTES

This engine is intended for model cars.
Do not attempt to use it for any other
purpose.

Mount the engine in your model
securely, following the manufacturers'
recommendations, using appropriate
screws and locknuts.

Install an effective Silencer (muffter).
Frequent close exposure to a noisy
exhaust (especially in the case of the
more powerful highspeed engines)
may eventually impair your hearing
and such noise is also likely to cause
annoyance to others over a wide area.

The wearing of safety glasses is also
strongly recommended.

Before starting the engine, always
check the tightness of all the screws
and nuts especially those of joint and
movable parts such as throttle arm.
Missing retightening the loose screws
and nuts often causes the parts
breakage that is capable of harming
you.

4

NOTES

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.

For their safety, keep all onlookers
(especially small children) well back
(at least 20 feet or 6 meters) when
preparing your model for running.

To stop the engine, fully retard the

throttle stick and trim lever on the
trans-mitter, or, in an emergency, cut
off the fuel supply by pinching the fuel
delivery line from the tank.

Warning! Immediately after a glowplug­ignition 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.

5

ENGINE CONSTRUCTION

With this engine, the piston will
feel tight at the top of its stroke
(TDC) when the engine is cold.
This is normal. The cylinder bore
has a slight taper. The piston
and cylinder are designed to
achieve a perfect running
clearance when they reach
operating temperature.

Near TDC

Piston

Cylinder Liner

Crankshaft
Slight taper

When the engine is cold. When the engine-is hot.

6

NOTES WHEN APPLYING
AN ELECTRIC STARTER

Do not over-prime. This could
cause a hydraulic lock and damage
the engine on application of the
electric starter.

If over-primed, remove glowplug,
close needle-valve and apply
starter to pump out surplus fuel.
Cover the head with a rag to
prevent pumped out fuel coming
into your eyes.

7

ABOUT THE ENGINE

This engine is designed especially to power the T­Maxx Revo. Purposelly designed LC3 glow plug is
supplied with the engine for improved power, fuel
economy and durability. The new 11K-R
carburetor offers easy handling as well as high
performance.

"T-Maxx Revo" is a trademark of Traxxas Corp.

Standard accessories

Glow Plug LC3

Exhaust Seal Ring 1 piece
Exhaust Manifold for T-Maxx Revo

BEFORE STARTING

Tools, accessories, etc.The following items are
necessary for operating the engine.

Items necessary for starting

FUEL

Generally, it is suggested that the user selects a fuel
that is commercially available for model two-stroke
engines and contains 10-30% nitromethane. As a
starting point, we recommend a fuel containing 20%
nitromethane, changing to a fuel containing more
nitro if necessary. When the brand of fuel is
changed, or the nitro content increased, it is
advisable to repeat the running-in procedure
referred to in the RUNNING-IN paragraphs. Please
note that with high-nitro fuels,
although power may be increased
for competition purposes,
glowplug elements do not last as
long and engine life will be
shortened.

8

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.

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. Do not smoke or allow anyone
else to smoke, near to it.

FUEL FILTER

To installed in the fuel line between
fuel tank and carburetor to prevent
dust coming into the carburetor.

GLOWPLUG IGNITER

Commercialy available handy
glowplug heater in which the
glowplug battery and battery
leads are integrated.

FUEL PUMP

For filling the fuel tank, a simple,
polyethylene "squeeze" bottle,

with a suitable spout, is required.

SILICONE FUEL LINE

Heatproof silicone tubing of
approx. 5mm o.d. and 2mm i.d.
is required for the connection
between the fuel tank and
engine.

9

TOOLS

HEX WRENCH

Necessary for engine installation.

1.5mm, 2mm, 2.5mm, 3mm

BASIC ENGINE PARTS

HeatsinkHead

SCREWDRIVER

Necessary for carburetor adjustments.
No-1, No.2,etc

LONG SOCKET WRENCH WITH PLUG GRIP

Recommended for easy removal and

replacement of the angled and recessed
glowplug, the O.S.Long Socket Wrench
incorporates a special grip.

Carburetor

Type 11 K-R

Exhaust

Rear Adaptor

Mounting Lugs

Crankcase

Crankshaft

10

CARBURETOR CONTROLS

Needle Valve

Mixture Control Valve

Throttle Stop

Screw

Thermo Insulator

Metering Needle

Four adjustable controls are provided on

this carburetor.

The Needle-Valve;

For adjusting the mixture strength
throttle is fully open.

The Mixture Control Valve:

For changing the mixture strength at mid
speed and acceleration. (Do not rotate the
screw more than one turn.)

The Metering Needle:

For adjusting the mixture strength at part­throttle and idling speeds, to obtain steady
idling and smooth acceleration to mid
speeds.

The Throttle Stop Screw:

For setting the minimum idle speed:

NOTE: Readjustment may be necessary,
occasionally to allow for changes in fuel
formula gear ratio or clutch engagement
point.

11

when the

FACTS ABOUT GLOWPLUGS

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 LC3. Carefully install plug finger-tight, before final
tightening with the correct size plug wrench.

The role of the glowplug

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.

Glowplug life

Particularly in the case of very high performance
engines, glowplugs must be regarded as expendable
items.

However, plug life can be extended and engine
performance maintained by careful use, i.e.:

Install a plug suitable for the engine.
Use fuel containing a moderate percentage of

nitromethane.
Do not run the engine too lean and do not leave the

battery connected while adjusting the needle.

When to replace the glowplug

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

body has corroded.
Engine tends to cut out when idling.
Starting qualities deteriorate.

12

adhered to filament or plug

INSTALLATION

First, remove the engine, installed as standard,
with the engine mount.

Install the flywheel and clutch.

13

Install the engine on the engine mount with
earth wire.

Install the electric starter taken from the
original engine.

Install the manifold supplied with the engine.

Adjust the aluminum stopper end so that the
throttle linkage may be made correctly.

15

Finally, insert the wire for glow plug heating in
the glow plug.

16

STARTING THE ENGINE & RUNNING-IN ('Breaking-in')

For long life and high performance, every
engine needs to be 'run-in' or 'broken-in'. With
care, running-in of the MAX-18TM can be
carried out with the engine installed in the
vehicle. Be sure to install the air-cleaner on the
carburetor and use a muffler-pressurized fuel
system.

The somewhat violent changes of vehicle
attitude 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 carburettor can vary and upset
running.Thereforejt is recommended that a
muffler pressurized fuel feed system be used.

Never run your vehicle without installing the
air cleaner. Dust and dirt that may otherwise
be drawn into the engine will rapidly shorten
its life.

Fill the tank completely with fuel.

Temporarily remove the glowplug to check
that it glows bright red when energized.

Element glows when energized.

Replace the plug when the
element does not glow or is
burnt out.

Glow Plug Igniter

17

Pliers

The carburetor of this engine is set at starting
setting when the engine leaves the factory.

Switch on the transmitter, and check that all the
linkage movescorrectly.

Remember!
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.

When the engine starts, first allow it to operate
in short runs on its very rich starting settings,
with the glowplug battery still connected and
with its driving wheels clear of the ground. The
rich mixture will, under these conditions,
provide adequate lubrication and cooling,
indicated by profuse smoke from the exhaust.

Next, disconnect the glowplug battery and try
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.

Run the car on the track until one tank of fuel has
been consumed, then close the Needle-Valve
30°. Repeat this procedure again until five 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°.

The position of the needle-valve

Needle

18

when starting the engine.

Close the needle-valve approx.
30 deg after running the vehicle
every one full tank of fuel.
Repeat this procedure around
five times.

Note:

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 or the fuel being changed,
especially to high nitro fuel, the complete
running-in should be repeated.

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.

Fuel

Warning!
Do not touch rotating parts, engine and si­lencer when stopping the engine as they
become very hot, and contact with them
may result in a serious burn.

19

FINAL ADJUSTMENT

Final adjustment should be carried out only after
the running-in has been completed.

Needle Valve

Metering Needle

Throttle Stop Screw

Open

Close

Open

Close

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 Needle­Valve 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

45~90 degrees.

More fuel Less fuel

Metering Needle

More fuel Less fuel

Needle Valve

20

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
idle mixture is top rich. In this case, turn the
Metering Needle 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 idle mixture is too
lean. Correct this by turning the Metering
Needle counter-clockwise 45-90°.

MOTE:

Metering Needle adjustment should be
made in steps of not more than 45-90°,
carefully checking the effect.on throttle
response, of each small adjustment.

Carry out adjustments patiently, under actual
running conditions, until the engine responds
quickly and positively to the throttle control.

Warning!

Mixture adjustments (whether via the

Metering Needle, 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.

With the optimum mixture control position,
light smoke is visible during high speed
running,and the engine rpm increases
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 the needle-valve and
metering needle slightly on the rich side of
the best rpm setting, as a safety measure.

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.

21

Finally, beyond the nominal break-in period,
a slight readjustment toward a leaner needle
setting may be required to maintain

maximum performance.

The correct functioning of the carburetor
depends on its small fuel orifices remaining
clear.

REALIGNMENT OF METERING NEEDLE AND

MIXTURE CONTROL VALVE

In the course of making carburetor
adjustments, it is just possible that the Metering
Needle and the Mixture Control Valve may be
inadvertently screwed in or out too far and

thereby moved beyond its effective adjustment

range.

The basic positions can be found by rotating
the Metering Needle until its slotted head is
flush with the Throttle Lever body.

Carburetor Body

22

Slide Valve

Carburetor Body

Throttle Lever

Rotate the Metering
Needle until its slotted
head is flush with the
Throttle Lever body.
This is the standard
position.

Metering Needle

First rotate the Mixture
Control 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

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.
One of these filters installed to the pickup
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.

2. 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.

3-Atthe 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.

4. 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.

Note:

Do not inject after-run oil into the
carburetor as this may cause the 0-rings
inside the carburetor to deteriorate. These

procedures will reduce the risks of starting
difficulties or corrosion after a period of
storage.

23

5. 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.

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 120C (248F), otherwise

it may be damaged and rendered
unserviceable.

Installing Dust Caps

When storing the engine, install the cap on

the exhaust port, carburetor, etc. to prevent

dust from entering the engine.

Dirt and dust may lodge in

24

marked places.

CHECKING THE ENGINE

Engine will not develop normal performance
after long time running due to wearing of parts.
It is suggested to replace necessary parts when
the following symptoms are detected.

Engine sound changes and easily overheats.

Power has dropped extremely.
Idling is unstable and/or engine tends to stop

at idling.

In most cases, ball bearings, cylinder & piston
assembly, connecting rod and/or crankcase have
become worn out or abnormal. Check the
parts carefully and replace them if necessary.

25

TROUBLE SHOOTING

Engine fails to fire.

Fuel tank is empty.
Fuel not reaching the engine.

Glowplug element is burnt out.

Glowplug battery discharged

Clogged fuel filter
Air cleaner and silencer inside is dirty.

Over priming
Fuel tubing is disconnected.

Fuel tubing is kinked, split or has a hole.

Incorrect carburetor settings

Incorrect servo linkage

Fill the tank with fuel and repeat
Priming procedure.

Replace glowplug.
Recharge or replace the battery.

Clean or replace fuel filter.

Replace cleaner element and clean inside silencer.
Remove glowplug and pump excess fuel.
Connect fuel tubing securely.

Check the tubing carefully and replace if necessary.

Return the metering needle

and mixture control valve to basic position.

Re-linkage after setting servo at neutral.

26

Engine fires intermittently but does not run.

Insufficient fuel in the tank.

Deteriorated glowplug

Clogged fuel filter
Air cleaner and silencer inside is dirty.

Engine overheated

Incorrect clutch release

Too immediately disconnecting plug battery.

Fuel in the tank extremely bubbled

Fill the tank with fuel.

Replace glowplug.

Clean or replace fuel filter.

Replace cleaner element and clean inside silencer.

Wait until engine is cooled.

Adjust the tension of clutch spring.
Do not disconnect plug battery and wait until

r.p.m, become stable.
Fit "0" rings to the tank screws to

prevent bubbles.

27

Unstable idle

Unsuitable glowplug

Unsuitable fuel
Extremely light flywheel

Silencer is disconnected or has play

Not reaching expected peak r.p.m.

insufficient warming up or running-in.

Silencer or manifold is not securely connected
or disconnected.

Fuel tubing from tank to is split or broken.

Use suggested glowplug in the instructions.

Do not use extremely high nitro or low oil fuel.
Add suitable load.

Install silencer securely.

Set the needle only after warming up.
Complete running-in.

Replace seal ring.
Check the connections and secure them.

Replace the tubing.

28

Poor response

Deteriorated glowplug
Incorrect carburetor settings

Incorrect setting of transmitter Exponential function.

Poor r.p.m, drop

Too much throttle opening at idle.

Incorrect carburetor fitting

Replace glowplug.

Readjust low r.p.m, range with metering
needle and mixture control valve.

Check the transmitter setting.

Close metering needle to adequate position
to lower idle r.p.m.

Fit carburetor securely.

29

16

M.+M2.6X7

14

15

13

12

ENGINE EXPLODED VIEW

C.M3X16

3

6

4

1

2

5

7

11

10

F'-Flat Head Screw N"-Round Head Screw S-"Set Screw

8

9

*Type of screw C -Cap Screw M—Oval Fillister-Head Screw

Piston Pin Retainer (2pcs.)

Piston Pin

Inner Head

Cylinder & Piston Assembly

Outer Head

21914000

21914100

21913000

1

2

3

21816000
4

Carburetor Complete (Type 11 K-R)

Connecting Rod

21915000

21982010

21817000

678

5

Carburetor Retainer

25381701

ENGINE PARTS LIST

Crankshaft Ball Bearing (Rear)

Crankcase

Crankshaft Ball Bearing (Front)

23731000

21911000

21931000

9

101112

Crankshaft

21912000

21922000

21824000

13

14

71653000

21911800

21923000

16

15

21427200

72103710

72106172

The specifications are subject to alteration for improvement without notice.

Exhaust Manifold forT-Maxx Revo

Manifold Spring (2pcs.)

Exhaust Seal Ring (2pcs.)

Glow Plug LC3

Screw Set

Rear Adaptor

Gasket Set

Starting Shaft

CARBURETOR EXPLODED VIEW

2-1

2

2-2

1-1

1-2

1

*s Type of screw

C...Cap Screw M...0val Fillister-Head Screw
F...Flat Head Screw N...Round Head Screw S...Set Screw

3

3-1

4

5

6

6-1

9

10

7

S.M3X3

8

32

CARBURETOR PARTS LIST

1

21982600

1-1

27881820
22781800

1-2

21285901

2

2-1

27881820
21881950

2-2

21982620

3

22781800

3-1

4

21982100

21982200

5

21982540

6

22781800

6-1

7

21982520

8

23818440

9

21982900

10

22615000

The specifications are subject to alteration for improvement without notice.

Mixture Control Valve Assembly

"0" Ring(L) (2pcs.)
"0" Ring(S) (2pcs.)

Needle Valve Assembly

"0" Ring (2pcs.)

No. 14 Universal Nipple Assembly

Throttle Stop Screw

"0" Ring(S) (2pcs.)
Carburetor Body (w/Thermo Insulator)
Slide Valve

Metering Needle Assembly

"0" Ring(S) (2pcs.)

Dust Cover
Throttle Lever
Thermo Insulator
Carburetor Rubber Gasket

33

RACING ENGINE PARTS

O.S. GENUINE PARTS & ACCESSORIES

O.S. Glow Plug

LC3

(71653000)

Dust Cap Set

3 (73300305)

For Carburetor Nipple

7(73300712)

For Silencer

12(73301212)

For Carburetor

Exhaust Seal Ring

(21427200)

(2pcs.)

Long Socket Wrench

With Plug Grip

(71521000)

The specifications are subject to alteration for improvement without notice.

Manifold Spring (2pcs.)

(72106172)

34

THREE VIEW DRAWING

SPECIFICATIONS

Displacement
Bore
Stroke

Practical R.P.M.
Power output

Weight

3.0cc (0.183cu.in.)

16.0mm (0.629in.)

15.0mm (0.590m.)
3,000-34,000 r.p.m.

1.6ps/29,000 r.p.m.
233g (8.22oz.)

Dimensions (mm)

35

GUARANTEED TO

KEEP YOUR R/C CAR
RUNNING WELL

KEEP IT CLEAN

Dirt is the most common way to ruin your engine. If it gets inside,
the dirt will act just like sandpaper and ruin the close fit that the
parts need for your engine to operate correctly

• Use an air filter to keep as much dirt outside as possible.
A two or three stage filter with an oiled foam element is the
best way to go.

• Dirt on the outside of the engine acts just like a blanket of
insulation and prevents proper cooling. Keep your engine
clean.

• Use a fuel filter. Dirt getting Into the fuel will clog the fuel
passages in the carburetor and also get those abrasive

particles inside. Keep your engine clean.

•Dirt

will

damage

your

are not covered by the engine manufacturer's warranty.

engine very quickly and repairs for

dirt

36

KEEP IT RICH

The high-speed needle valve is used to adjust the mixture of fuel
and air needed to get the optimum performance from your engine.
If it's adjusted too lean, your engine will get less fuel than it should.

•You must remember that the engine gets its lubrication from
the oil that's in the fuel. If you run it too lean, the engine will
not get enough oil to keep the internal parts lubricated, even
thought It sounds better.

• Parts will start to run hot and then seize. The result is a
typical problem as a broken connecting rod that seized to
the crankshaft, and then broke as the crankshaft tried to
continue to turn.

• Keep the engine running on the rich side of the highest
RPM setting to ensure proper lubrication.

KEEP IT ON THE GROUND

You should run your engine at high speeds only when you are
driving the car.

• Do not put the car on the box or stand with the wheels off

the ground and then run the engine.You'll quickly overspeed

your engine and ruin It. Generally, the connecting rod will
break from the over-revving.

• Do not remove the engine from the car and try to run it with

just the flyweel. That does the same as described above. The
engine must be run with the load of the car when driving.

KEEP IT COOL

If you run your engine good and hot, you'll have a nice chunck of
useless aluminum in a short time.

•Running the engine hot causes the oil in the fuel to break
down and quit working. The repairs won't be cheap.

Your engine is equipped with a special heat-sink cylinder head to

make sure it gets enough cooling..

•Keep the head clean so that the dirt doesn't act like an
insulating blanket.

•Make sure that any airflow passes through the fins of the

cylinder and head.

• Make as many cutouts in the car's body as necessary, and
don't skimp on the size.

KEEP IT LUBED

Make sure you're using a fuel from a reputable, name-brand
manufacturer.

•Your fuel should have at least the amount of oil
recommended by the engine manufacturer. If you can't find
a particular recommendation on oil content, then use a fuel
with 20%-22% oil content.

•If you're trying to run a fuel with more than 20%
Nitromelhane, you should add some oil to your fuel, such as
KlotzTechniplate™or Baker "AA" Castor Oil".

KEEP IT PROPERLY
LUBED DURING
STORAGE

If you let your engine sit with nothing done to it after you last ran it,
the internal parts will start to corrode... especially the steel
crankshaft and ball bearings. They'll rust. If the fuel has castor oil

in It, it will begin to dry out and become gummy.

• Rust inside an engine will erode tight clearances and score

polished surfaces.

• Gummy fuel residue blocks oil holes in connecting rods and

crankshafts.

37

GUARANTEED TO

KEEP YOUR R/C CAR

RUNNING WELL

(CONTINUED)

Here's how to prevent rust;

• At the end of the day's running, pull the fuel line from the engine.

• Drain the tank, and then start the engine.

• Let it run until it's absolutely dry of fuel.

•Add several drops of an after-run oil. There are several after-run
oils on the hobby market. You can also make your own from a 50-

50 mixture of "Marvel Mystery Oil" and automatic transmission
fluid.

•After adding the after-run oil, turn the engine over several times
to make sure it's worked into all of the engine's internals. Add
more if you are not sure that you put in enough.

(Continued)

KEEP GOOD POWER

Nitro, or Nitromethane, is the main power ingredient in model fuels.
Raising the nitro content will make the fuel "hotter"— that is, allow

the engine to develop more power. More is better, right? Not really.

•Unless your engine is designed and ported for high-nitro
fuels, you won't see much gain in performance above 20%­25%.

•While some people are running nitro levels as high as 50%,
they have modified their engines to handle it. They've also
carefully blended their fuel to make sure they have enough
oil.

•The best performance enhancer Is a good driver, A driver
who can keep the car on the track will usually beat a less
experienced driver with a hotter set up.

KEEP IT SMOOTH

When you tighten the pilot shaft onto your flywheel, it can be hard
to keep the engine from turning over. It may be tempting to stick
something into the exhaust port to keep the piston from moving,

but do not do this! You'll also put a nice "ding" in the piston and in
the cylinder liner. You've just ruined your nice, new engine. A new
ABC piston/cylinder assembly (the most commonly-used kind in

R/C car engines) will put a nice hole In your pocketbook.

38

(CONTINUED)

This kind of damage is not covered under the warranty.

• If the flywheel can't be tightened onto the engine without it trying
to turn over, grip the drive washer in a pair of large adjustable
pliers, like Channel Locks'", with the drive washer protected
under several layers cloth. You could also try a strap wrench.

•If you feel more adventurous, you can remove the rear cover of
the engine and insert a piece of wooden dowel stock or plastic
rod to keep the crankshaft from turning. Don't put anything into
the engine that will hit the piston.

KEEP AWAY FROM

SILICONE SEAL AND

THREAD STICKERS

Silicone sealers usually have a smell like vinegar when they're
curing. Vinegar is mostly acetic acid and that causes corrosion.

•The inside of an engine has two kinds of metal in it...
aluminum for most of the parts and steel for the crankshaft
and bearings.

•Two different kinds of metal will start to corrode if they have
some kind of electrolyte between them and a tiny bit of acid
will do the job.

• Aluminum corrosion can cause the entire inside of the
engine to turn a dark grey or nearly black color. Corroded
steel is rust. See above about rust.

KEEP IT DRY

While it sounds obvious, keeping water out of your engine isn't as
easy as it sounds. Sure, you can dry it out when you've run

through some mud or puddles, but how about condensation?

•Changes in temperature can cause moisture in the air to

condense inside the engine. This can happen in the winter
and summer, so keep your model inside the house, not in the
garage.

• Keeping it Inside the house also gives you good reason to

keep it clean just try to explain oil spots on the carpet when
your engine is dripping oil from a just-finished running
session.

39

© Copyright 1999-3032046

40

LIMITED

WARRANTY

Your engine is guaranteed to be free of defects in parts and workmanship for a period of 2 years
from the date of purchase when returned for service accompanied by Your proof of purchase.
Crash damage and problems caused by neglect or abuse will not be covered under warranty.
Damagecaused by customer disassembly, tampering, use of substandard fuel, use of incorrect
accessories (glow plug, prop, etc.) ,or any use of the engine for which it is not specifically intended
will automatically void the warranty of the engine.
Should your engine require warranty or non-warranty

service please return it via UPS or

insured Parcel Post to our national servicing facility:

Hobby Services
P.O.Box 4021
1610 Interstate Dr.
Champaign IL 61821
Ph. 217-398-0007

Along with Your engine and proof of purchase date please enclose a complete written explanation

detailing the problems. State your name and address clearly.
For repairs not covered under warranty, you must specify whether you wish the charges to
be billed C.O.D. or if you wish to be notified of the charges so you can send a check.

6-15 3-Chome Imagawa Higashisumiyoshi-ku

Osaka 546-0003, Japan TEL. [phone]

URL: http://www.os-engines.co.jp

© Copyright 2004 by O.S.Engines Mfg. Co., Ltd. All rights reserved. Printed in Japan. 60091540 090400

FAX. [phone]