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18

Do not leave unused fuel in the engine at the conclusion of a 
day's  flying.  Accepted  practice  is  to  cut  off  the  fuel  supply 
while the engine is still running - at full throttle  - then, expel 
as  much  fuel  residue  as  possible  by  turning  the  engine  over 
for 5-10 seconds with the electric starter. 
Finally, inject some after-run oil through the glowplug hole and 
turn the engine over several times by hand.
When  the  engine  is  not  to  be  used  for  some  months  (for 
example, as between flying seasons) a worthwhile precaution 
is  to  remove  it  from  the  airframe  and,  after  washing  off  the 
exterior  with  alcohol  (not  gasoline  or  kerosene)  to  carefully 
remove  the  fuel  pump,  carburettor  with  intake  pipe  and  all 
silicone tubing and put them safely aside.
Make sure that the engine is reasonably clean externally, then 
remove the glowplug and immerse the engine in a container 
of  kerosene.  Rotate  the  crankshaft  while  the  engine  is 
immersed. If foreign matter is visible in the kerosene, rinse the 
engine again in clean kerosene, before removing it, vigorously 
shaking off the excess and wiping it dry.  

CARE & MAINTENANCE (laying up)

The  fuel  pump  assembly,  carburettor/pressure-regulator  and 
silicone  tubing  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  could  find  its  way  into  the 
pump  unit,  carburettor,  etc.  Inject,  sparingly,  preserving  oils, 
rust  inhibitors,  etc.  unless  approved  for  silicone-rubber 
products. 
An appropriate alternative here may be one of the high-quality 
synthetic lubricating oils.
Finally,  seal  the  engine  in  a  heavy  polyethylene  bag  until 
required for reinstalling the airframe.

Debris tends to

accumulate in

this area

19

RADIAL MOTOR MOUNT

O.S.GLOW PLUG
TYPE F

EX EXHAUST HEADER PIPES

FLEXIBLE EXHAUST PIPES

BOOSTER TERMINAL KIT

BOOSTER CABLE SET

PROPELLER LOCKNUT SET

(For Spinner)

NON-BUBBLE
WEIGHT

SUPER FILTER (L)

LONG SOCKET WRENCH
WITH PLUG GRIP

Type

Length 

(mm)

Inside

Outside

Code.No.

O.S. GENUINE PARTS & ACCESSORIES

For FS-91SⅡ/SⅡ-P

For 

FS-70SⅡ 

(71901100)

(71615009)

(72200130)

(72200110)

(71521000)

(72109500)

(72109600)

(71905000)

(72200060)

M2.6x12

(79871040)

M3.5x8

(79871060)

M3.5x15

(79871090)

M3.5x20

(79871100)

(72403050)

(71531000)

(72200080) 

(45910200)

(45910300)

72108100
72108110
72108120
72108130

1111A
1111B
1111C
1111D

120
240
170
330

NEEDLE VALVE
EXTENSION CABLE SET

5/16"-M5 PROPELLER 
LOCKNUT SET FOR SPINNER

VALVE ADJUSTING
TOOL KIT

CAP SCREW SET (10pcs.)

The specifications are subject to alteration for improvement without notice.

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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