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.
SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR 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.
! 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. • Mount the engine in your model securely, following the manufacturers' recommendations, using appropriate screws and locknuts. • 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. • Install an effective silencer (muffler).
Near TDC ENGINE CONSTRUCTION With this engine, the piston will feel tight at the top of its stroke Piston (TDC) when the engine is cold. Cylinder Liner This is normal. The cylinder bore has a slight taper. The piston and cylinder are designed to achieve clearance a perfect when Crankshaft running they Slight taper reach operating temperature. When the engine is cold. 6 NOTES WHEN APPLYING AN ELECTRIC STARTER Do not over-prime.
NOTES ON OPERATION While Operating GUARANTEE Please do not run on a public street, this could cause serious accidents, personal injuries and/or propetry damage. This engine is constructed from the very best materials available and to the very highest engineering standards, using the most advanced precision machinery.
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.
BASIC ENGINE PARTS Outer Head Exhaust Carburetor Type 21M Cover Plate Crankshaft Mounting Lugs Crankcase Crankshaft Ball Bearing (Front) 12 INSTALLATION OF THE STANDARD ACCESSORIES About the Head Gasket The engine is installed with a 0.1mm thick and a 0.2mm thick gasket for 25% nitro fuel when it leaves the factory. Also, a 0.2mm thick gasket is supplied with the engine as standard. Adjust the total thickness according to atmospheric temperature, humidity and glowplug used. Installing the glow plug.
GLOWPLUG Glowplug life Since the compatibility of the glowplug and fuel may have a marked effect on performance and reliability, it is suggested to use the O.S. RP7 plug when it is necessary to replace. Carefully install plug finger-tight, before final tightening with the correct size plug wrench. 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.
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.
STARTING THE ENGINE & RUNNING-IN ('Breaking-in) ! PRESSURIZED FUEL SYSTEM 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.
Switch on the transmitter and make sure that each linkage moves correctly. Do not force the needlevalve to turn beyond a lightly closed position. Set the throttle opening a little wider that the factory setting by adjusting the Throttle Stop Screw. Turn the engine with starter box to draw fuel into the engine. approx 1mm Deliver fuel into the carburetor. Fuel tank side Fuel Now connect glowplug battery lead to heat the plug filament and start the engine.
How to stop the engine The position of the needle-valve when starting the engine. Needle To stop the engine, close the throttle to idle speed and shut it off completely with the trim lever on the transmitter then cut off the fuel supply by pinching the fuel delivery tube to the carburetor. Close the needle-valve approx. 15˚ after running the vehicle for 1 to 2 full tanks of fuel. Repeat this procedure until approx. 2 liters of fuel have been consumed. Note: In the event of any major working parts (e.g.
Warning! 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 too rich.
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.
TROUBLE SHOOTING Symptom Engine fails to fire. Corrective action Cause Fuel tank is empty. Fuel not reaching the engine. Fill the tank with fuel and repeat Priming procedure. Glowplug element is burnt out. Glowplug battery discharged Replace glowplug. Recharge or replace the battery. Clogged fuel filter Air cleaner and silencer inside is dirty. Clean or replace fuel filter. Replace cleaner element and clean inside silencer. Over priming Remove glowplug and pump out excess fuel.
Symptom Unstable idle Corrective action Cause Unsuitable glowplug Use suggested glowplug in the instructions. Unsuitable fuel Do not use extremely high nitro or low oil content fuel. Extremely light flywheel Add heavier flywheel. Silencer is disconnected or has play Install silencer securely. Symptom Not reaching expected peak r.p.m. Corrective action Cause Insufficient warming up or running-in. Set the needle only after warming up. Complete running-in.
33 22014000 22014100 22014160 22014170 22013000 22016000 21817000 23755020 22082000 23981740 23731000 22011000 23730020 22012000 23764020 22417000 23763010 71642070 22014160 22826140 71533010 22615000 71801100 22884250 Description Outer Head Inner Head Head Gasket Set (0.2mm) Head Gasket Set (0.1mm) Cylinder & Piston Assembly Piston Pin Piston Pin Retainer (2pcs.
CARBURETOR EXPLODED VIEW 2 2-1 3 3-1 5 5-1 4 4-1 5-1 1-1 1-2 1 8 7 8-1 6 11 9 10 12 10-1 Type of screw S.M3x3 S...Set Screw 34 CARBURETOR PARTS LIST No. Code No. 1 1-1 1-2 2 2-1 3 3-1 4 4-1 5 5-1 6 7 8 8-1 9 10 10-1 11 12 22082600 46066319 22781800 22082970 46066319 22082940 22082950 22848160 27881820 71533385 22615000 22082100 22082200 22082340 27881820 23981520 23781400 26381501 23781110 29015019 Description Mixture Control Valve Assembly "O" Ring (L) (2pcs.) "O" Ring (S) (2pcs.
O.S. GENUINE PARTS & ACCESSORIES Super Air Cleaner 202 Assembly O.S. Glow Plug On-road Type (72412000) RP6 202 Cleaner Body (72412100) (71642060) RP7 (71642070) 202 Filter Element (4pcs.) (72412200) RP8 (71641800) Long Socket Wrench With Plug Grip Dust Cap Set (71521000) 3mm (5pcs.) (73300305) 16mm (3pcs.) (73301612) 18mm (3pcs.) (73301812) The specifications are subject to alteration for improvement without notice. 36 THREE VIEW DRAWING SPECIFICATIONS 37 45 3.49 cc (0.213 cu.in.) 16.
MEMO 38 URL : http://www.os-engines.co.jp 6-15 3-Chome Imagawa Higashisumiyoshi-ku Osaka 546-0003, Japan TEL. (06) 6702-0225 FAX. (06) 6704-2722 C Copyright 2009 by O.S.Engines Mfg. Co., Ltd. All rights reserved. Printed in Japan.
