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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.

Expressly for 1/8 off-road truck (Truggy)

racing competitions

19-23

27-29

24-26

30-33

34-35

10-12

CONTENTS

INSTALLATION OF THE CARBURETOR

ENGINE INSTALLATION

STARTING THE ENGINE &RUNNING-IN
("Breakinh-in")

FINAL ADJUSTMENT

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

36-37

SAFETY INSTRUCTIONS AND
WARNINGS ABOUT YOUR O.S. ENGINE

ENGINE CONSTRUCTION

NOTES WHEN APPLYING AN ELECTRIC
STARTER

NOTES ON OPERATION

ABOUT THE ENGINE

BEFORE STARTING

BASIC ENGINE PARTS

CARBURETOR CONTROLS

GLOWPLUG

INSTALLATION OF THE STANDARD
ACCESSORIES

38-39

Содержание MAX-25XZ

Страница 1: ... etc are accessible for checking at the same time Expressly for 1 8 off road truck Truggy racing competitions 1 2 5 6 7 8 14 15 19 23 27 29 24 26 30 33 9 16 34 35 17 18 10 12 13 CONTENTS INSTALLATION OF THE CARBURETOR ENGINE INSTALLATION STARTING THE ENGINE RUNNING IN Breakinh in FINAL ADJUSTMENT CARE AND MAINTENANCE CHECKING THE ENGINE TROUBLE SHOOTING ENGINE EXPLODED VIEW PARTS LIST CARBURETOR E...

Страница 2: ... 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 3 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 h...

Страница 3: ...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 5 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 ha...

Страница 4: ...ct running clearance when they reach operating temperature Near TDC Slight taper When the engine is cold When the engine is hot 7 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 ra...

Страница 5: ...fit into its intake Secure it changing its angle according to the car chassis NOTE 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 While Opera...

Страница 6: ...s This is to use with joint tube connection type silencer 11 TOOLS HEX SCREWDRIVER SCREWDRIVER Necessary for engine installation 1 5mm 2mm 2 5mm 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 FUEL Generally it is suggested tha...

Страница 7: ...LICONE 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 7 2V BATTERIES FOR STARTER BOX Batteries for starter box Select according to the starter box used Be sure to fully charge before using Model engine fuel is also highly flammable Keep it away from open flame excessive heat sources of sparks or anything else which ...

Страница 8: ... of nitromethane unless more is essential for racing events Do not run the engine too lean and do not leave the battery connected while adjusting the needle 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...

Страница 9: ...ivered the engine has its carburetor lightly installed in the intake boss Secure it as follows 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 1 2 Rotate the retainer nut gently until it stops Tighten further 120 180 Rotate the retainer screw gently until ...

Страница 10: ...efore starting the engine always check the tightness of all the screws and nuts especially the mounting screws 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 Never run your vehicle without installing the air cleaner Dust and dirt that may otherwise be drawn into the engine will rapidly shorten its...

Страница 11: ...ox 3 5 turns opened from the fully closed position Throttle is set approx 0 5mm open Approx 0 5mm open factory setting with the reducer removed 21 Metering needle and mixture control valve are set at basic position Refer to P26 Turn the engine with starter box to draw fuel into the engine Fuel Deliver fuel into the carburetor Fuel tank side Now connect glowplug battery lead to heat the plug filame...

Страница 12: ...osition before starting the engine When the engine starts warm it up by repeatedly increasing the rpm to medium speed and back again to a fast idle with the mixture set very rich the glowplug connected and the driving wheels clear of the ground The rich mixture will provide adequate lubrrication and cooling indicated by profuse exhaust smoke 23 The position of the needle valve when starting the en...

Страница 13: ...osition 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 With the eng...

Страница 14: ...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 f...

Страница 15: ...GINE Iftheenginewillnotdevelopnormalperformance 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 Idle is unstable and or engine tends to stop at idle In most cases ball bearings cylinder piston assembly connectingrodand orcrankcasehave become worn...

Страница 16: ...rrect servo linkage Connect correctly after setting servo at neutral Reverse rotating direction of starter box Mare sure it rotates counter clockwise seen from crankshaft side TROUBLE SHOOTING 31 Symptom Cause Corrective action Engine fires intermittently but does not run Insufficient fuel in the tank Fill the tank with fuel Deteriorated glowplug Replace glowplug Clogged fuel filter Air cleaner an...

Страница 17: ...ng Check the connections and secure them Fuel tubing from tank is split or broken Replace the tubing 33 Symptom Cause Corrective action Symptom Cause Corrective action Poor response Deteriorated glowplug Replace glowplug Incorrect carburetor settings Readjust low r p m range with metering needle and mixture control valve Incorrect setting of transmitter Exponential function Check the transmitter s...

Страница 18: ...n Retainer 2pcs Connecting Rod Carburetor Complete Type 21JN Carburetor Retainer Assembly O Ring 2pcs Crankshaft Ball Bearing Front Crankcase Crankshaft Ball Bearing Rear Crankshaft Cover Plate Screw Set Glow Plug T P3 Exhaust Seal Ring Dust Cap Set 3mm 16mm 18mm Description Code No No 1 2 3 3 1 4 5 6 7 8 9 9 1 10 11 12 13 14 15 22854200 22854100 22854140 23764020 22853000 22856000 21817000 237550...

Страница 19: ...uretor Reducer 8mm RED O Ring Needle Assembly O Ring Needle Holder Assembly Fuel Inlet No 15 Throttle Stop Screw O Ring Mixture Control Valve Assembly O Ring L 2pcs O Ring S 2pcs Carburetor Body w Thermo Insulator Thermo Insulator Carburetor Rubber Gasket Description Code No No 1 1 1 2 3 3 1 4 5 5 1 6 6 1 7 7 1 8 8 1 9 9 1 9 2 10 11 12 23781400 26381501 23981520 23818340 27881820 22848210 71533000...

Страница 20: ...0 M2000 EXHAUST HEADER PIPE ASSEMBLY Header Pipe Spring 2pcs Exhaust Seal Ring 2pcs T 2060WN TUNED SILENCER ASSEMBLY SUPER JOINT TUBE21 39 71812000 71812100 71801100 71813000 71813100 71801100 71521000 72413000 72413200 LONG SOCKET WRENCH WITH PLUG GRIP DUST CAP SET 3mm 73300305 8mm 73300812 16mm 73301612 18mm 73301812 SUPER AIR CLEANER 203 203 Filter Element 4pcs 5pcs 3pcs 3pcs 3pcs The specifica...

Страница 21: ...17 0mm 0 6691in 4 000 39 000 r p m 3 1ps 33 000 r p m 370g 13 05oz 21 37 31 6 45 29 5 44 21 6 28 5 15 6 UNF1 4 28 93 2 4 3 3 C Copyright 2009 by O S Engines Mfg Co Ltd All rights reserved Printed in Japan 60092280 031001 TEL 06 6702 0225 FAX 06 6704 2722 6 15 3 Chome Imagawa Higashisumiyoshi ku Osaka 546 0003 Japan URL http www os engines co jp ...

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