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.
CONTENTS IF THE ENGINE FAILS TO START SAFETY INSTRUCTIONS AND WARNINGS 2~5 ABOUT YOUR O.S. ENGINE INTRODUCTION, BASIC ENGINE PARTS VALVE ADJUSTING 6 INSTALLATION OF THE CARBURETOR ENGINE INSTALLATION 7~8 SUPER AIR CLEANER TYPE 102S NOTES CONCERNING THE RECOIL STARTER 8~9 9~10 GLOWPLUG 10~11 TOOLS, ACCESSORIES, etc.
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.
WARNINGS • 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 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 engines generate considerable heat. Do not touch any part of your engine until it has cooled.
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. • Fit an effective silencer (muffler).
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 tube from the tank. • Pull the operating handle straight out when starting the engine, so that the cord does not rub against the vehicle body or engine. This will help prevent the cord from being damaged by abrasion or engine heat. • Do not attempt to disassemble the recoil starter of the 40S-CX.
INTRODUCTION BASIC ENGINE PARTS These are overhead-valve four-strokecycle engines designed for 1/8 scale radio-controlled model cars. The engine is distinguished by a blackanodized crankcase and rocker-cover and is supplied complete with an O.S. Super Air Cleaner as standard. The FS-40S-CX is equipped with a built in recoil starter system which eliminates the need for a separate electric starter and starter battery.
ENGINE INSTALLATION INSTALLATION OF THE CARBURETOR 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 3.5mm or 4-40 steel Allen hexagon socket type.
Secure with locknuts. If the bottom of the recoil starter housing would otherwise touch the car chassis, install the engine mount spacers (supplied) between the engine's mounting lugs and the engine mount. Use the M3.5x15 screws provided. With some vehicles, it may be necessary to make minor trimming modifications to chassis or body when fitting the engine.
• Position REPLACEMENT OF ELEMENT the air cleaner correctly, so that it does not foul the cylinder-head or obstruct the needle-valve. • It is advisable to replace the filter element with a new one after not more than one hour of running time. Always remove contaminated elements carefully, to ensure that dirt cannot enter the carburettor. FIT THE FILTER ELEMENT • The element is already impregnated with a special filter oil.
◆ This will help prevent the cord from being GLOWPLUG damaged by abrasion or engine heat. The FS-40S-C and FS-40S-CX are supplied with an O.S. Type F glowplug, specially designed for O.S. four-stroke engines. ◆ Try to avoid spilling fuel over the starter unit and its cord. Some fuels have a detrimental effect on these parts. ◆ The starter prevents the engine from being rotated in the wrong direction. The unit will be damaged if you attempt to force the flywheel in the opposite direction (i.e.
However, plug life can be extended and engine performance maintained by careful use, i.e.: TOOLS, ACCESSORIES, etc. The following items are necessary for operating the engine. • Install a plug suitable for the engine. • Use fuel containing a moderate percentage of FUEL 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. Use only top quality methanol-based model engine fuel.
ELECTRIC STARTER AND STARTER BATTERY as described in the RUNNING-IN paragraphs. When engines are run at very high speeds and on high-nitro fuels, glowplug elements will not last as long. Use a 12-volt electric starter with suitable battery for starting the engine.(FS-40S-C) LONG SOCKET WRENCH Reminder! Recommended for easy removal and replacement of the angled and recessed glowplug, the O.S.Long Socket Wrench incorporates a special grip. Model engine fuel is poisonous.
PRESSURIZED FUEL SYSTEM STARTING, RUNNING AND ADJUSTMENT ● In the interests of a long working life and high performance, every internal-combustion engine needs to be "run-in" (or "broken-in" as the procedure is also known). This means giving the engine extra care and attention during the first hour or so of its operational life. New parts need to become "bedded-in", i.e. smoothed and aligned to reduce friction and avoid distortion.
With an aircraft engine, cooling is also aided, in large measure, by the slipstream and some model car enthusiasts elect to carry out initial running-in, in this way by bench-mounting the engine and temporarily fitting it with an aircraft type drive hub and propeller. In the case of the O.S.
Note! Four stroke engine have stronger compression than two stroke engines. Hold the chassis firmly when pulling the recoil starter. Also, wearing of gloves is recommended to avoid any risk of injury. Front Rotating Direction Rear 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.
● After running the engine for four or five tanks of fuel, begin closing the needle 5-15 degrees between succeeding runs. Also, vary its speed, from idling to medium RPM, with the throttle. See sketch. Re-adjust the throttle stop screw, if neccessary, so that the car may not move at idling. The position of the needle-valve when starting the engine.
IF THE ENGINE FAILS TO START VALVE ADJUSTING ● ALL O.S. four-stroke engines have their valve(tappet) clearances correctly set before they leave the factory. However, if, after many hours of running time have been logged, a loss of power is detected, or if the engine has to be disassembled or repaired as a result of an accident, valve clearances should be checked and readjusted, as necessary. O.S. Valve Adjusting Tool Kit is available as optional accessory.
(1) Note: If the gap is found to be less than 0.04mm, it is not necessary to readjust the clearance if the engine has good compression and starts easily. Equally, if the gap exceeds 0.10mm but is not more than 0.14mm (i.e. the thickness of both feeler gauges inserted together), it is not essential to readjust the clearance if the engine runs satisfactorily. 1. Remove the cover from the rocker-box on top of the cylinder-head, using the correct size Allen hex key. 2.
2. Turn adjusting-screw approx. 1/2 turn counterclockwise to open gap, using appropriate tool i.e. Allen hex key. (Fig.3.) Adjusting Screw 4. Re-tighten locknut while holding adjusting screw stationary. (Fig.5.) Hold at the screw head. Turn approx. 1/2 turn. Allen Key Fig.5 Fig.3 Tighten Locknut. 5. Remove 0.04mm feeler, rotate the crankshaft through two revolutions and recheck gap. 6. If clearance is correct, slacken locknut on the other rocker-arm and repeat steps 1 to 5 above.
● CARE & MAINTENANCE ● At the end of each operating session, drain the fuel tank, then energize the glowplug and try to re-start the engine to burn off any fuel that may remain inside. Repeat this procedure until the engine fails to fire. Then remove the glowplug and drain off any residue while the engine is still warm. 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.
RACING ENGINE PARTS ■ O.S.Glow Plug GENUINE PARTS & ACCESSORIES ■ Super Air Cleaner 102S (71615009) ■ FS-40S-C Hyper Exhaust Pipe Set (72403202) TYPE F 102S Cleaner Body ■ Dust Cap Set φ4 For Carburettor Nipple (5pcs.) (73300305) φ10 (72403212) (45226200) FOR FS-40S-C/CX 101,102 Filter Elements (72403120) (6pcs.) For Carburettor (3pcs.
FS-40S-C EXPLODED VIEW C.M2.6X12 2 C.M3X18 3-2 3-1 5-4 5-3 5-2 M3.5 3 (C.M3X12) 4-1 4 4-2 9 C.M2.6X8 8 5 8-1 7 5-1 0 6 q = 1 w 22 e r a s-2 t s-1 s s-2 d y g f p u C.M3X8 ✽ Type of screw o i [ ] [ \ C.M2.
No. 1 23 2 3 3-1 3-2 4 4-1 4-2 5 5-1 5-2 5-3 5-4 6 7 8 8-1 9 0 = q w e r t y u i o p [ ] \ a s s -1 s -2 d f g Description Code No.
FS-40S-CX EXPLODED VIEW C.M2.6X12 2 C.M3X18 3-2 3-1 5-4 5-3 5-2 M3.5 3 (C.M3X12) 4-1 4 4-2 9 C.M2.6X8 8 5 8-1 7 5-1 0 6 q = 1 24 w e r d f-2 t f-1 y o f f-2 g C.M3X8 i j h M.M2.6X7 u-2 ] u-1 [ u ✽ Type of screw p \ a \ s C.M2.
25 No. Code No.
CARBURETTOR EXPLODED VIEW & PARTS LIST No. Code No. 1 2 2081 408 Throttle Lever Assembly 2 2 1283 210 Carburetor Dust Cover 3 4 5285 200 Carburettor Rotor 4 4 5285 100 Carburettor Body 5 2 2681 310 Throttor Stop Screw 6 6-1 2 1481 900 Needle-valve Assembly 6-2 2 1481 950 7 2 2615 000 6-1 6 5 6-2 2 1 3 4 2 7881 820 Description "O" Ring(2pcs.) Universal Nipple Carburettor Rubber Gasket Specifications are subject to alteration for improvement without notice.
FS-40S-C THREE VIEW DRAWING Dimension(mm) 17.5 80.5 42 6.49cc (0.396cu.in.) 21.2mm (0.835in.) 18.4mm (0.724in.) 3,000~21,000r.p.m. 0.9bhp/17,500r.p.m. 323.5g (11.41oz.) 16.5 Displacement Bore Stroke Practical R.P.M. Power output Weight 49 Specification 20.
FS-40S-CX THREE VIEW DRAWING Dimension(mm) Specification 42 80.5 49 17.5 6.49cc (0.396cu.in.) 21.2mm (0.835in.) 18.4mm (0.724in.) 3,000~21,000r.p.m. 0.9bhp/17,500r.p.m. 407g (14.35oz.) 20 Displacement Bore Stroke Practical R.P.M. Power output Weight 20 38.
TA BL ISH ING NC ES E E ANC UNEQ UA L I TY PRECISION & P ERF QUA ED OR M LL L CEL THE STAN ARDS OF EX D E 6-15 3-Chome Imagawa Higashisumiyoshi-ku Osaka 546-0003, Japan TEL. (06) 6702-0225 FAX. (06) 6704-2722 C Copyright 2000 by O.S.Engines Mfg. Co., Ltd. All rights reserved. Printed in Japan.
