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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 2-6 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 aircraft, radio control equipment, etc., 
are accessible for checking at the same time.

1

2-6

7

8

9

10-12

13-14

15-21

21

27-29

30

31

10

12

SAFETY INSTRUCTIONS AND WARNINGS 
ABOUT YOUR O.S. ENGINE

INTRODUCTION,BASIC ENGINE PARTS

INSTALLATION

INSTALLATION OF CHOKE ROD, NEEDLE VALVE 
EXTENSION

SILENCER,
LINKAGE OF THROTTLE LEVER

BEFORE STARTING 

FUEL AND PRESSURE LINES

ADVICE ON SELECTION OF FUEL,
GLOEPLUG & PROPELLER

STARTING THE ENGINE

CONTENTS

RUNNING -IN

CARBURETOR

CARBURETOR AIR-BLEED ADJUSTMENT

TROUBLE SHOOTING WHEN THE 
ENGINE FAILS TO START

VALVE ADJUSTING

CARE AND MAINTENANCE

GENUINE PARTS & ACCESSORIES

ENGINE EXPLODED VIEWS & PARTS LIST

CARBURETOR EXPLODED VIEWS
& PARTS LIST

THREE VIEW DRAWING

MEMO

22-23

24

25-26

32-35

36-37

38-39

40

Summary of Contents for FS-30S

Page 1: ...t radio control equipment etc are accessible for checking at the same time 1 2 6 7 8 9 10 12 13 14 15 21 21 27 29 30 31 10 12 SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O S ENGINE INTRODUCTION BASIC ENGINE PARTS INSTALLATION INSTALLATION OF CHOKE ROD NEEDLE VALVE EXTENSION SILENCER LINKAGE OF THROTTLE LEVER BEFORE STARTING FUEL AND PRESSURE LINES ADVICE ON SELECTION OF FUEL GLOEPLUG PROPELLER STA...

Page 2: ...sonous 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 Never operate your engine in an en closed space Model engines like auto mobile engines exhaust deadly carbon monoxide Run your engine only in an open area Model engines generate considerable heat Do not touch any part of your engine until it has cooled C...

Page 3: ...ary before restarting the engine particularly in the case of four stroke cycle engines If a safety locknut assembly is provided with your engine always use it This will prevent the propeller from flying off in the event of a backfire even if it loosens If you install a spinner make sure that it is a precision made product and that the slots for the propeller blades do not cut into the blade roots ...

Page 4: ... a glowplug ignition engine has been run and is still warm conditions sometimes exist whereby it is just possible for the engine to abruptly restart if the propeller is casually flipped over compression WITHOUT the glowplug battery being reconnected Remember this if you wish to avoid the risk of a painfully rapped knuckle 7 Silencer Body Choke rod FS 40S FS 30S INSTALLING THE GLOWPLUG Carburetor I...

Page 5: ...r top surfaces are in the same plane 3mm steel nuts for FS 30S 3mm steel screw for FS 30S 3 5mm steel screw for FS 40S 3mm steel Allen screw for FS 30S At least 12mm 1 2 for FS 30S At least 15mm 19 32 for FS 40S 9 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 tightening the set screw using 1 5mm Allen w...

Page 6: ...i cd battery a large heavy duty 1 5volt dry cell or a 2 volt rechargeable lead acid cell accumulator 11 1 5 volt heavy duty dry battery or 2 volt rechargeable lead acid cell at least 5Ah If a 2 volt cell is employed use a resistance wire as shown to reduce applied voltage otherwise element will overheat and burn out Resistance coil nichrome wire Adjust applied voltage by changing the position of c...

Page 7: ...Note that even a small quantity of nitromethane 3 5 will improve flexibility making the needle valve adjustment less critical and improving throttle response Use only materials of the highest purity Synthetic oils are permissible but are less tolerant of a lean run than castor oil If therefore a synthetic lubricant is used in the fuel readjust the needle valve to a slightly richer setting as a saf...

Page 8: ...Filament surface has roughened and turned white Filament coil has become distorted Foreign matter has adhered to filament or plug body has corroded Engine tends to cut out when idling Starting qualities deteriorate Glowplug life Particularly in the case of very high performance engines glowplugs must be regarded as expendable FS 30S 9x6 7 10x4 10x5 6 15 STARTING THE ENGINE Preparations 1 Installin...

Page 9: ...ed position Fully opened position Throttle Open Close Fuel will flow from tank to carburetor as propeller is turned Close the air intake by operating the choke control FS 40S Turn the propeller four revolutions while watching fuel line Turn the propeller 3 to 4 turns counter clockwise smartly by finger in the direction of arrow Turn approx 10 turns when the engine is cold 7 Priming 17 8 Hold model...

Page 10: ...rotating pro peller If the engine stops when battery leads are disconnected close the needle valve a little approx 45 further and restart the engine 19 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 continuous high pitched exhaust note only will be heard Key to the needle valve adjustment Turn 15 30 at ...

Page 11: ...cticable to re start the engine on its optimum running setting Also if the engine is being re started immediately after a run i e hot priming should not be necessary 21 17 How to stop the engine Close the throttle to reduce to the lowest possible r p m Close With the transmitter throttle trim lever fully retarded adjust the throttle servo linkage so that the throttle rotor is fully closed i e engi...

Page 12: ... engine to be varied proportionally from idling speed to full power The carburetor of your engine has been factory set for the approximate best results and no adjustment except to the needle valve should be required provided that the fuel tank is correctly located as previously described After the engine has been run in check the operation of the throttle according to the following chart Re adjust...

Page 13: ...ed 20 30 open from maximum r p m setting Yes No Yes Engine stops Engine stops Engine stops 24 CARBURETOR AIR BLEED ADJUSTMENT Start engine and adjust needle valve as previously described Close the throttle gradually Find the idling position Hold the model Hold model level then slowly raise its nose If rpm increases If engine runs unevenly or stops Immediately point nose down so that engine runs st...

Page 14: ...ks 26 Symptom Factor Cause Corrective action 2 3 1 2 3 3 3 3 2 Voltage too high or too low Re check and readjust referring to BEFORE STARTING paragraph 4 Continue flipping propeller If engine does not start after more than 10 flips disconnect battery from glowplug and leave for a few minutes then re energize plug and flip prop again If engine still does not start remove glowplug and pump out exces...

Page 15: ...be closed If the prop driver drive hub of your engine is engraved with a letter T this mark should now be at the top 2 The standard valve clearance on both inlet and exhaust valves is between 0 04mm and 0 10mm 0 0015 0 004 inch measured between valve stem and rocker arm Use the 0 04mm and 0 10mm feeler gauges to check clearances See Fig 1 3 1 28 Note If the gap is found to be less than 0 04mm it i...

Page 16: ...the fuel tank with methanol or fuel before installing it Install a fuel filter in the fuel line between tank and carburettor Install a fuel filter in the outlet of your squeeze bottle or to the pump inlet if you use a manual or electric pump do not leave your fuel container open needlessly check filters periodically and clean them when necessary Do not leave raw fuel in the engine at the conclusio...

Page 17: ...le Exhaust Pipes Super Filter L NON BUBBLE Weight Long Socket Wrench With Plug Grip 71615009 71521000 72200080 O S GENUINE PARTS ACCESSORIES For FS 30S 71908300 For FS 40S 71906000 For FS 40S 45810100 72200060 NEEDLE VALVE EXTENSION SET 72403050 71531000 1010A 72108300 1010B 72108310 For FS 40S ...

Page 18: ...t Piston Ring Piston Piston Pin Connecting Rod Cylinder Liner Cover Plate Crankshaft Crankshaft Spacer Crankshaft Ball Bearing Rear Crankcase Thrust Ball 2pc Camshaft Cam Cover Push Rod 2pcs Push Rod Cover Assembly 2pcs Push Rod Cover 1pcs Push Rod Cover O Ring 2pcs Cam Follower 2pcs Crankshaft Ball Bearing Front Drive Hub Lock Nut Set F 2010 Silencer Assembly Silencer Body Pressure Nipple No 5 Ex...

Page 19: ... Gasket Piston Ring Piston Piston Pin Connecting Rod Cylinder Liner Choke Valve Assembly Cover Plate Breather Nipple Crankshaft Crankshaft Ball Bearing Rear Crankcase Camshaft Bearing Camshaft Cam Cover Push Rod 2pcs Push Rod Cover Assembly 2pcs Push Rod Cover 1pcs Push Rod Cover O Ring 2pcs Cam Follower 2pcs Crankshaft Ball Bearing Front Drive Hub Propeller Washer Propeller Nut Silencer Assembly ...

Page 20: ...1200 43081100 45281700 22081811 43081900 45781970 43081960 22611302 45281920 22081820 37 TYPE FS 40S N M3X6 C M2 6X7 M2 6X5 S M3X3 22081408 22081313 45281120 45281110 45281700 22081811 45281910 45781970 26381501 45283960 23011308 45281920 22081820 CARBURETTOR EXPLODED VIEW PARTS LIST Specifications are subject to alteration for improvement without notice Throttle Lever Assembly Throttle Lever Reta...

Page 21: ...ING Dimension mm Specification Displacement Bore Stroke Practical R P M Power output Weight 18g 0 6 oz Weight of Silencer 39 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 65ps 12 000 r p m 355g 12 5 oz FS 40S FS 40S THREE VIEW DRAWING Dimension mm Displacement Bore Stroke Practical R P M Power output Weight Specification Weight of Silencer 21 2g 0 7 oz ...

Page 22: ...me Imagawa Higashisumiyoshi ku Osaka 546 0003 Japan C Copyright 2002 by O S Engines Mfg Co Ltd All rights reserved Printed in Japan URL http www os engines co jp U N E Q U A LLED QUALITY PRECISION PERFOR M A N C E E S T A BLISHING THE STANDARDS OF EXCELLE N C E ...

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