O.S. engine MAX-21TM Manuale utente

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.

2-5

23-24

26-29

8-10

13-16

30-33

17-19

20-22

CONTENTS

STARTING THE ENGINE & RUNNING-IN

FINAL ADJUSTMENT

CARBURETOR CLEANLINESS

CARE AND MAINTENANCE

CHECKING THE ENGINE

TROUBLE SHOOTING

ENGINE EXPLODED VIEW & PARTS LIST

CARBURETOR EXPLODED VIEW &

PARTS LIST

O.S. GENUINE PARTS & ACCESSORIES

THREE VIEW DRAWING

34-37

SAFETY INSTRUCTIONS AND

WARNINGS ABOUT YOUR O.S. ENGINE

ENGINE CONSTRUCTION

NOTES WHEN APPLYING AN ELECTRIC

STARTER

ABOUT THE ENGINE

BEFORE STARTING

BASIC ENGINE PARTS

CARBURETOR CONTROLS

FACTS ABOUT GLOWPLUG

INSTALLATION 38

39-40

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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.

SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O.S. ENGINE

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 events which

might involve serious (in

extreme circumstances, even

fatal) injury.

These cover the many other

possibilities, generally less obvious

sources of danger, but which, under

certain circumstances, may also

cause damage or injury.

!

WARNINGS

Model engine fuel is poi-

sonous. Do not allow it to

come into contact with the

eyesormouth.Alwaysstore

it in a clearly marked con-

tainer 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 en-

closed 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.

••

•

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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 (muffler).

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.

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.

NOTES

•

!

NOTES

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 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.

•

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.

Piston

Cylinder Liner

Crankshaft

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

Slight taper

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

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 any pumped out fuel from

getting into your eyes.

Standard accessories

Glow Plug LC3

Exhaust Seal Ring 1piece

ABOUT THE ENGINE

Exhaust Manifold for Revo

Items necessary for starting

Tools, accessories, etc.The following items are

necessary for operating the engine.

BEFORE 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.

T-Maxx and Revo are trademarks of Traxxas Corp.

Exhaust Manifold for T-Maxx

These engines are designed especially to power

the T-Maxx or Revo. Purposely designed LC3

glow plug is supplied with the engine for

improved power, fuel economy and durability.

The carburetor offers easy handling as well as

high performance.

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!

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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

GLOWPLUG IGNITER

Commercialy available handy

glowplug heater in which the

glowplug battery and battery

leads are integrated.

To be installed in the fuel line

between fuel tank and carburetor

to prevent foreign matter from

entering the carburetor.

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.

TOOLS

HEX SCREWDRIVER

SCREWDRIVER

Necessary for engine installation.

1.5mm, 2mm, 2.5mm, 3mm

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.

Heatsink Head

Crankcase

Mounting Lugs

Exhaust

Carburetor

Type 11K

Crankshaft

Rear Adaptor

BASIC ENGINE PARTS

MAX-21TM (T-Maxx)

CARBURETOR CONTROLS

11K, 11K-R

The Needle-Valve:

The Mixture Control Valve:

Four adjustable controls are provided on

this carburetor.

For adjusting the mixture strength when the

throttle is fully open.

For changing the mixture strength at mid

speed and acceleration. (Do not rotate the

screw more chan one turn.)

The Throttle Stop Screw:

For setting the minimum idle speed:

For adjusting the mixture strength at part-

throttle and idle speed, to obtain steady

idling and smooth acceleration to mid speed.

The Metering Needle:

NOTE: Readjustment may be necessary,

occasionally to allow for changes in fuel

formula gear ratio or clutch engagement

point.

Metering Needle

Throttle Stop

Screw

Mixture Control Valve

Needle Valve

Thermo Insulator

FACTS ABOUT GLOWPLUGS

The role of the glowplug

Glowplug life

Particularly in the case of very high performance

engines,

glowplugs must be regarded as expendable

items.

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.

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.

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.

However, plug life can be extended and engine

performance maintained by careful use, i.e.:

Apart from when actually burned out, a plug may

need to be replaced because it no longer delivers its

best performance, such as when:

When to replace the glowplug

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.

INSTALLATION

First, remove the original engine, from the

engine mount.

Install the flywheel and

clutch.

Install the engine on the engine mount with

ground wire.

Install the electric starter taken from the

original engine.

Install the manifold supplied with the engine.

T-Maxx Revo

Adjust the stopper end so that the throttle

linkage may be made correctly.

Adjust the plastic ball end so that the throttle

linkage may be connected correctly.

T-Maxx Revo

Finally, connect the wire for glow plug heating

to the glow plug.

Finally, insert the wire for heating the glow

plug.

T-Maxx

Revo

For long life and high performance, every

engine needs to be 'run-in' or 'broken-in'. With

care, running-in of the MAX-21TM 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.

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

Fill the tank completely with fuel.

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 carburetor can vary and upset

running.Therefore,it 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.

Temporarily remove the glowplug to check

that it glows bright red when energized.

Glow Plug Igniter

Pliers

Element glows when energized.

Replace the plug when the

element does not glow or is

burnt out.

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 Control Valve 30˚.

The carburetor on this engine has been set at

the starting setting when the engine leaves the

factory.

Switch on the transmitter, and check that all the

linkage moves correctly.

30˚

Needle

The position of the needle-valve

when starting the engine.

Close the needle-valve approx.

30˚ after running the vehicle for

every one full tanks of fuel.

Repeat this procedure around

five times.

30˚



Note:

If the engine should need to be disassem-

bled (e.g. for cleaning or minor parts re-

placement), it is advisable to return the nee-

dle-valve to the original rich, starting set-

ting 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.

Fuel

Warning!

Do not touch rotating parts, engine and si-

lencer when stopping the engine as they

become very hot, and contact with them

may result in a serious burn.

To stop the engine, close the throttle to idle

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.

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