Os-engines FS-40S User Manual

It is of vital importance, before attempting to operate your engine, to read the general 'SAFETY INSTRUCTIONS AND WARNINGS' section on pages

The FS Series engines are equipped with self-reopening choke valves.Cut the choke rod (supplied) to the length indicated, then secire the rod by tight

SILENCERThe FS-26S and FS-40S are supplied with silencers as standard equipment.Installation for FS-26SSlide the silencer over the exhaust pipe, and s

4 Glowplug batteryThe power source for heating the glowplug may be either a large heavy-duty 1.5volt dry cell, or preferably, a 2-volt rechargeable l

Fuel Can Filter311 Silicone tubingThis is required for the connection between the fuel tank and engine.10 Fuel can filterInstall a filter in the outle

FuelUse a good quality commercial fuel or one of the blends shown in the table. Fuel "A" is suitable for running-in and ordinary use. Fuel &

9x6~7FS-26STrainer & SportNever touch, or allow any object to come into contact with, the rotating propeller and do not crouch over the engine whe

STARTING THE ENGINEPreparations1 Installing the glowplugInstall the washer on the glowplug and screw carefully into cylinder-head, making sure that i

CloseOpen4 Opening and closing of the needle-valveTurn needle-valve clockwise to close (for leaner mixture).Turn needle-valve counter-clockwise to op

8 Hold model securely when starting9 Setting the throttle10 Heat glowplugStarterAssistant should hold the model so that it cannot move forward when

Check that the throttle is one-third open from the fully closed position. Bring the starter into contact with the spinner nut or spinner and depress t

2~678911~1213~1415~212127~2930311012SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O.S. ENGINEINTRODUCTION,BASIC ENGINE PARTSINSTALLATIONINSTALLATION OF

20~30°15 Needle-valve adjustment(2)As the needle-valve is closed beyond the initial readjustment, the rpm of the engine will be increased and a conti

On starting from cold, with the needle-valveset at the rich starting position:Take note of this position of the needle-valve.This will produce the pra

17 How to stop the engineClose the throttle to reduce to the lowest possible r.p.m.CloseWith the transmitter throttle trim lever fully retarded, adju

These engines are equipped with a throttle type car-burettor which provides a wide range of engine speed control. With the throttle lever linked to a

Start the engine.Make sure that the throttle isfully open.Adjust the neede-valve.Close the throttle gradually.Find the idling position.Fix the idling

CARBURETTOR AIR-BLEED ADJUSTMENTStart engine and adjust needle-valve as previously described.Close the throttle gradually.Find the idling position.app

SymptomFactorCauseCorrective actionRecharge the electric starter battery.Recharge lead-acid cell or replace dry battery. (Note: An unused, or almost u

SymptomFactorCauseCorrective actionVoltage too high or too low. Re-check and readjust referring to "BEFORE STARTING" paragraph 4.Continue fl

VALVE ADJUSTINGALL O.S. four-stroke engines have their valve(tappet) clearances correctly set before they leave the factory. However, if, after many h

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.Eq

Remember that your engine is not a "toy", but a highly efficient internal-combustion machine whose power is capable of harming you, or other

3.Fig.4Insert 0.04mm feeler gauge between valve stem and rocker-arm and gently turn adjusting screw clockwise until it stops.(Fig.4.)0.04mm FeelerGaug

CARE AND MAINTENANCE To ensure that you obtain long life and peak performance from your engine, observe the following.Avoid running the engine under d

6.49 cc (0.396 cu.in.)21.2mm (0.835 in.)18.4mm (0.724 in.)2,200~12,000 r.p.m.0.65 bhp / 12,000 r.p.m.355g (12.5 oz.)FS-40S4.41 cc (0.269 cu.in.)18.5mm

-09C.M2.6X78C.M2.6X18C.M2.6X12C.M2.6X7C.M2.6X7\asdfytrewq=743215-45-35-24-14-23-23-156\-1\-2[\-25-1iuop]8-1y-1gFS-26S ENGINE EXPLODED VIEW✽Type of scr

Specifications are subject to alteration for improvement without notice.4 5769 0004 4125 0002 3210 0072 3009 0064 5708 0004 5231 0004 5264 0002 4881 8

\asdf\-1\-2[\-2op]go-09C.M2.6X78C.M3X18C.M2.6X12C.M3X8C.M2.6X7ytrewq=743215-45-35-24-14-23-23-1565-1iu8-1FS-40S ENGINE EXPLODED VIEW✽Type of screw C…C

DescriptionCode No.Screw SetRocker CoverRocker Support Assembly Rocker Support Rocker Arm Retainer (2pcs.)Rocker Arm Assembly (1pair) R

TYPE FS-26S/FS-40S123541-1N.+M3X6C.M2.6X7766-16-26-36-46-5M2.6X5S.M3X322081408220813134528120045281100452817002208181145281910457819702638150145283960

(72403050)(71521000)(71615009)(71531000)For 26S (71908300)For 40S (71906000)For 40S 1/4''-28 (23024008)For 40S(45810100)For 40S1010A (721083

MEMO38

WARNINGSModel 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

C Copyright 2000 by O.S.Engines Mfg. Co., Ltd. All rights reserved. Printed in Japan.UNEQUALLEDQUALITYPRECISION&PERFORMANCEESTABLISHINGTHESTANDAR

NOTES•••••This engine was designed for model aircraft. Do not attempt to use it for any other purpose.Mount the engine in your model securely, followi

NOTES••Always check the tightness of the propeller nut and retighten it, if necessary, before restarting the engine, particularly in the case of four-

NOTES•••••Adjust the throttle linkage so that the engine stops when the throttle stick and trim lever on the transmitter are fully retarded. Alternati

•Silencer Body•Choke rod•Silicone tubingFS-26SFS-40SINSTALLING THE GLOWPLUGCarburetor Install washer on glowplug and insert carefully into cylinder-he

INSTALLATIONHow to fasten the mounting screws.Hardwood mounting beamsO.S. radial motor mount(cast aluminum)Tighten second nut firmlydown onto first nu