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 SAFETY INSTRUCTIONS AND WARNINGS 2~5 ABOUT YOUR O.S. ENGINE BASIC ENGINE PARTS 6 ENGINE INSTALLATION 7 AIR CLEANER TYPE 101 8 NOTES CONCERNING THE RECOIL STARTER 9 GLOWPLUG 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 transmitter, 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 12CV-X.
INTRODUCTION BASIC ENGINE PARTS These are overhead-valve four-stroke-cycle engines designed for 1/10 scale radiocontrolled model cars. They are based on the latest version of the well-established FS-26S aircraft engine, incorporating many improved or purpose designed parts, including a special crankshaft, revised camshaft, stronger valve-springs and new carburettor with short straight through inlet tract to the combustion-chamber for improved breathing.
INSTALLING THE GLOWPLUG Install the washer on the glowplug and insert carefully into cylinder-head, making sure that it is not cross-threaded before tightening firmly. mounting lugs, enlarge them slightly with a needlefile so that screws enter vertically. Avoid forcing the screws. 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.
FILTER ELEMENTS AIR CLEANER TYPE 101 ¡ This is a heavy-duty wet type air cleaner that has been developed specifically for O.S. model car engines. It contains specially impregnated filter elements which prevent highly damaging dust and dirt from being drawn into the engine through the carburettor, yet allow engine performance to be maintained for longer periods between element renewals.
REPLACEMENT OF ELEMENTS ◆ This will help prevent the cord from being damaged by abrasion or engine heat. It is advisable to replace the upper filter element with a new one after not more than one hour of running time. It is not necessary to discard the lower element as frequently, but be sure to change it when it becomes soiled. Always remove contaminated elements carefully, to ensure that dirt cannot enter the carburettor. ◆ Try to avoid spilling fuel over the starter unit and its cord.
GLOWPLUG However, plug life can be extended and engine performance maintained by careful use, i.e.: The FS-26S-C and FS-26S-CX are supplied with an O.S. Type F glowplug, specially designed for O.S. four-stroke engines. • Install a plug suitable for the engine. • Use fuel containing a moderate percentage 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.
The following items are necessary for operating the engine. rechecked 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. FUEL Reminder! TOOLS, ACCESSORIES, etc. Use only top quality methanol-based model engine fuel.For consistent performance and long engine life, it is advisable to use fuel containing AT LEAST 18% lubricant. This engine is designed to run on both low and high nitromethane content fuels,i.
ELECTRIC STARTER AND STARTER BATTERY PRESSURIZED FUEL SYSTEM Use a 12-volt electric starter with suitable battery for starting the engine.(FS-26S-C) ● 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 carburettor, means that fuel 'head' at the carburettor can vary and upset running.Therefore,it is recommended that a muffler pressurized fuel feed system be used.
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.
● Turn the needle-valve gently clockwise until it stops. Do not use force to turn the needle beyond this point. Now reopen it 2 turns. ● Set the throttle-stop screw so that the minimum throttle opening (idle setting) is approximately 1.5mm. ● Switch on the transmitter, followed by the receiver. Close the throttle stick and open the throttle trim lever to the idle setting. ● Front Rotating Direction 1.
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. ● Eventually, the engine will begin to loosen up sufficiently to allow short bursts of full-throttle acceleration with the needle-valve at its optimum setting. Note! Do not close the needle-valve any further.
30˚ 20 ˚~ 30 30 ˚ IF THE ENGINE FAILS TO START Check the following: Glowplug battery discharged or glowplug defunct. ● Fuel not reaching carburettor. ● Engine flooded. Do not over-prime. (This could also cause hydraulic lock and damage the engine on application of the electric starter.) Remove glowplug, close needlevalve and apply starter to pump out surplus fuel. (Cover the plug hole with a foided cloth, so that fuel cannot spiash into your face.
VALVE ADJUSTING (1) 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. The kit comes in a plastic case and includes: (Code No.72200060) 1.
2. Turn adjusting-screw approx. 1/2 turn counterclockwise to open gap, using appropriate tool i.e. Allen hex key. (Fig.3.) 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. Adjusting Screw Turn approx.
4. Re-tighten locknut while holding adjusting screw stationary. (Fig.5.) CARE & MAINTENANCE ● Hold at the screw head. Fig.5 Tighten Locknut. 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. PARTS REPLACEMENT ● Over a long period, depending on how well your engine has been protected from the ingress of dust and grit and other causes of wear and tear, loss of performance may eventually occur in the form of reduced power, reluctant starting, unstable idling, etc.
GENUINE PARTS & ACCESSORIES ■ O.S.Glow Plug TYPE F RACING ENGINE PARTS ■ Super Joint Tube 15 ■ T-1020Tuned Silencer ■ F-2000 4C Car Silencer (72103020) (72103310) (44125100) (71615009) ■ Super Air Cleaner 101 ■ Dust Cap Set (72403100) ■ 101,102 Filter Elements (72403120) (6pcs.
FS-26S-C EXPLODED VIEW C.M2.6X12 2 C.M2.6X18 4-2 3-1 4-1 3-2 5-4 5-3 5-2 3 4 0 N.+M3.5X5 1 5 9 0-1 7 8 22 C.M2.6X7 --1 --2 5-1 6 = q \ e w a-2 - a-1 r a a-2 s t f d[ y i u-1 C.M2.6X7 u ✽ Type of screw C.M2.
No. Code No.
FS-26S-CX EXPLODED VIEW 2 C.M2.6X12 C.M2.6X18 1 3-1 4-2 3 4 4-1 0 N.+M3.5X5 3-2 5-4 5-3 5-2 5 9 0-1 7 8 6 24 C.M2.6X7 --1 5-1 --2 = q s e w d-2 - d-1 r d d-2 f t i h u g\ y-2 C.M2.6X7 y-1 p o-1 y ✽ Type of screw C.M2.
25 No. Code No.
CARBURETTOR EXPLODED VIEW & PARTS LIST N.+M3X6 2 1-1 N.+M3.5X5 7 4 6 1 3 No. Code No. Description 1 2 2081 408 1-1 2 2081 313 2 2 1781 200 3 2 2081 811 4 2 1381 130 5 2 1181 902 Throttle Lever Assembly Throttle Lever Retaining Screw Carburettor Rotor Throttle Stop Screw Carburettor Body Needle-valve Assembly Needle Nozzle Assembly Ratchet Spring Carburettor Rubber Gasket Carburettor Retaining Screw (2pcs.
FS-26S-C THREE VIEW DRAWING 4.41cc (0.269cu.in.) 18.5mm (0.728in.) 16.4mm (0.648in.) 2,000~22,000r.p.m. 0.5bhp/17,000r.p.m. 242.5g (8.56oz.) 32.8 70.4 84.6 Displacement Bore Stroke Practical R.P.M. Power output Weight 43 36 Specification 14 UNF1/4-28 39.
FS-26S-CX THREE VIEW DRAWING Dimension(mm) Specification 4.41cc (0.269cu.in.) 18.5mm (0.728in.) 16.4mm (0.648in.) 2,000~22,000r.p.m. 0.5bhp/17,000r.p.m. 308g (10.87oz.) 70.4 36 43 14 20 Displacement Bore Stroke Practical R.P.M. Power output Weight 35.2 20 28 39.
Q U A LIT Y PRECISION & P ERFO RM AN NC E UN ES LED CE UAL EQ T AB L IS H IN G T H E STA N D A R D S O F EXCE LLE 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.
