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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  2-4  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

2-4

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8

8-9

9-10

11-12

12

15

15-17

17-18

19

20-25

26-27

28-30

 

13-14

SAFETY INSTRUCTIONS AND 
WARNINGS ABOUT YOUR O.S. ENGINE

INTRODUCTION, INSTALLING THE GLOWPLUG

RELOCATION OF CARBURETTOR CONTROLS

FUEL TANK, INSTALLATION

EXHAUST HEADER PIPE AND SILENCER,
THROTTLE LINKAGE, 
NEEDLE-VALVE EXTENSION

FUEL LINES

CARE OF FUEL PUMP AND REGULATOR,
PROPELLERS

GLOWPLUGS, FUEL

PROPELLER AND SPINNER ATTACHMENT,
TYPE 60R, 60P AND 60N CARBURETTOR

CONTENTS

RUNNING-IN

IDLE MIXTURE ADJUSTMENT

VALVE  ADJUSTING

CARE AND MAINTENANCE

O.S. GENUINE PARTS & ACCESSORIES

ENGINE EXPLODED VIEWS &
ENGINE PARTS LISTS

CARBURETTOR EXPLODED VIEWS &
PARTS LIST

ENGINE THREE VIEW DRAWINGS

STARTING

13

Summary of Contents for fs-70II

Page 1: ...ontrol equipment etc are accessible for checking at the same time 1 2 4 5 6 7 8 8 9 9 10 11 12 12 15 15 17 17 18 19 20 25 26 27 28 30 13 14 SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O S ENGINE INTRO...

Page 2: ...y part of your engine until it has cooled Contact with the muffler silencer cylinder head or exhaust header pipe in particular may result in a serious burn The advice which follows is grouped under tw...

Page 3: ...lly flipped over compression WITHOUT the glowplug battery being reconnected Remember this if you wish to avoid the risk of a painfully rapped knuckle NOTES 5 The O S FS 70S FS 91S and FS 91S P are bui...

Page 4: ...12 13 minutes flying time dependent upon the type of fuel used the size of the propeller and on the proportion of full throttle to part throttle operation through the flight Make sure that the tank i...

Page 5: ...ith the header pipe or silencer may result in a serious burn If you need to tighten the silencer joints which may loosen when they are hot use a thick folded cloth for protection FUEL LINES For fuel l...

Page 6: ...d on a methanol based fuel containing not less than 18 castor oil or a top quality synthetic lubricant or a mixture of both plus a small percentage 5 15 of nitromethane for improved flexibility and po...

Page 7: ...der automatically Starting procedure is as follows Check that the current to the glowplug is switched off Check that the polarity of the starter battery leads rotates the engine counter clockwise when...

Page 8: ...y cause the engine to stall Therefore at this time the aircraft should as far as is possible be flown at an altitude sufficient to enable an emergency landing to be safely made if the engine stops 9 1...

Page 9: ...te prop through two revolutions and recheck gap 5 If clearance is correct loosen the locknut on the other rocker arm and repeat steps 1 to 5 above Finally replace rocker box cover 6 Remember Excessive...

Page 10: ...ng must be cleansed separately in methanol or glow fuel On no account must they come into contact with kerosene Before completely reassembling the engine make sure that no kerosene remains inside that...

Page 11: ...25010 45910100 44014010 44001100 Cam Cover Camshaft Camshaft Ball Bearing 1pc Breather Nipple No 5 Crankcase Crankshaft Ball Bearing R Crankshaft Cover Plate Cylinder Liner Connecting Rod Piston Pin P...

Page 12: ...0 45925010 45910100 45903200 Description Code No No The specifications are subject to alteration for improvement without notice Description Code No No Cam Cover Camshaft Camshaft Ball Bearing 1pc Brea...

Page 13: ...45231100 45771000 45901010 45914010 45530030 45902010 45907010 72508001 46103100 45605000 45906000 71615009 45926000 45925100 45925010 45910100 Cam Cover Camshaft Camshaft Ball Bearing 1pc Breather Ni...

Page 14: ...081970 45984900 1 1 1 1 2 1 3 1 4 1 5 2 3 4 5 5 1 5 2 6 7 8 9 Description Code No No Needle Valve Assembly Needle Assembly O Ring 2pcs Set Screw Needle Valve Holder Assembly Ratchet Spring Carburetor...

Page 15: ...troke PracticalR P M Output Weight Specifications THREE VIEW DRAWING C Copyright 2000 by O S Engines Mfg Co Ltd All rights reserved Printed in Japan TEL 06 6702 0225 FAX 06 6704 2722 6 15 3 Chome Imag...

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