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, NOTES WHEN |
|
APPLYING AN ELECTRIC STARTER |
6-7 |
NOTES ON OPERATION, |
|
ABOUT THE ENGINE |
8-9 |
TOOLS, ACCESSORIES, etc. |
|
BASIC ENGINE PARTS |
10-12 |
INSTALLATION OF THE STANDARD |
|
ACCESSORIES, GLOWPLUG |
13-14 |
INSTALLATION, |
|
CARBURETOR CONTROLS 21M |
15-17 |
STARTING THE ENGINE & RUNNING-IN |
|
('Breaking-in) |
18-22 |
FINAL ADJUSTMENT |
23-25 |
CARE AND MAINTENANCE |
26-27 |
TROUBLE SHOOTING |
28-31 |
ENGINE EXPLODED VIEW &PARTS LIST |
32-33 |
CARBURETOR EXPLODED VIEW &PARTS LIST |
34-35 |
O.S. GENUINE PARTS & ACCESSORIES |
36 |
THREE VIEW DRAWING |
37 |
MEMO |
38 |
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 eyesormouth.Alwaysstore 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. • The wearing of safety glasses is also
Do not attempt to use it for any other |
strongly recommended. |
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.
•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.
4
!NOTES
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.
•To stop the engine, fully retard the throttle stick and trim lever on the transmitter, 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 any pumped out fuel from getting into your eyes.
7
NOTES ON OPERATION
GUARANTEE
This engine is constructed from the very best materials available and to the very highest engineering standards, using the most advanced precision machinery. However, the extremely high stresses imposed by car racing operation under very severe conditions, as well as stresses which are exacerbated by the use of powerful fuels containing very high concentrations of nitromethane, constitute hazards which are beyond a manufacturer's control. Accordingly, we regret that it is not possible to extend our usual warranty terms to this particular engine -i.e. no guarantee is offered against material wear, or damage resulting from, actual use.
While Operating
Please do not run on a public street, this could cause serious accidents, personal injuries and/or propetry damage.
Please do not run near pedestrians or small children.
Please do not run in small or confined areas.
Please do not run where loud noises can disturb others, such as hospitals and residential areas.
NOTE
As delivered, the engine has the carburetor lightly fit into its intake. Secure it changing its angle according to the car chassis.
8
ABOUT THE ENGINE
The MAX-21XZ-R is expressly designed for 1/8 On-Road Racing. All the major parts are newly designed. Crankshaft passenger port is filled with silicone for increased intake efficiency and two tungsten weights are pressed into the counterweight for increased torque and mid speed. Cylinder liner has seven scavenging ports and three exhaust ports for increased combustion efficiency. Combustion chamber and carburetor are newly designed to best match these parts. Also, better balanced stronger connecting rod and lighter weight piston are employed. O.S. standard of easy to handle characteristics and high performance have been realized.
Standard accessories
Glow Plug RP7
T-type head (Turbo head) 1piece
Exhaust Seal Ring 1piece
Cylinder-head gasket
(0.2mm) 1 piece
Caburetor Reducer 9mm (Blue) 1piece
Flywheel No.1E Collet 1piece
Dust Cap 3, 16, 18 1piece each
9
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.
REMINDER! 
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.
10
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 be installed in the fuel line between fuel tank and carburetor to prevent dust from entering the carburetor.
GLOWPLUG IGNITER
Commercialy available handy glowplug heater in which the glowplug battery and battery leads are integrated.
STARTER BOX
For starting the engine.
BATTERIES FOR STARTER BOX
Batteries for starter box.Select according to the starter box used. Be sure to fully charge before using.
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
Necessary for engine installation. 1.5mm, 2mm, 2.5mm, 3mm
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.
11
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