It is of vital importance, before attempting to operate your engine, to read the general 'SAFETY INSTRUCTIONS AND WARNINGS' section on page
ABDCMake sure there is adequate ventilation.<FS-91S2-P>The function of the various tubes connected to the engine and tank (see sketch) are as fo
10NEVER disassemble the fuel pump or pressure regulator. Their original performance may not be restored after reassembly.DO NOT obstruct the small rec
FUELThe FS-70S2, FS-91S2 and FS-91S2 -P should be operated on a methanol based fuel containing not less than 18% castor-oil, or a top quality syntheti
Since the FS-70S2, FS-91S2 and FS-91S2-P are intended to be started with an electric starter, the addition of a spinner assembly for centering the sta
STARTINGThe FS-70S2, FS-91S2 and FS-91S2-P are not fitted with manual choke controls, as they are intended for use with an electric starter only. A hi
Start and adjust the engine as detailed in the starting instructions.Now open the throttle fully and run the engine for no more than 5 seconds with th
• Feeler gauge 0.04mmALL O.S. four-stroke engines have their valve(tappet) clearances correctly set before they leave the factory. However, if, after
Note:Valve clearances of all O.S. four-stroke-cycle engines must be checked and reset ONLY WHEN THE ENGINE IS COLD. Procedure is as follows.Remove the
Re-tighten locknut while holding adjusting screw stationary. (Fig.5.)4.Hold at thescrew head.Fig.5Tighten Locknut.Remove 0.04mm feeler, rotate prop th
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 s
2-456788-99-1011-12121515-1717-181920-2526-2728-3013-14SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O.S. ENGINEINTRODUCTION, INSTALLING THE GLOWPLUGREL
(71901100)(71615009)(72200130)(72200110)(71531000)(72403050)(71521000)721081007210811072108120721081301111A1111B1111C1111D120240170330(72109500)(72109
FS-70S2 EXPLODED VIEWType of screw C…Cap Screw B…Binding Head Screw M…Oval Fillister-Head ScrewF…Flat Head Screw N…Round Head Screw S…Set Screw iu
No.No.FS-70S2 PARTS LISTWoodruff KeyDrive HubThrust WasherCrankshaft Ball Bearing(F)Cam Follower(2pcs.)Push Rod Cover "O" Ring(2pcs.)Push Ro
FS-91S2 EXPLODED VIEWType of screw C…Cap Screw B…Binding Head Screw M…Oval Fillister-Head ScrewF…Flat Head Screw N…Round Head Screw S…Set Screw iu
No.iuytrewq=-0-20-109-29-19876-46-36-26-165-45-35-25-154-24-143-23-1321op[]\dfghasa-1g-1a-2FS-91S2 PARTS LISTWoodruff KeyDrive HubThrust WasherCranksh
Type of screw C…Cap Screw B…Binding Head Screw M…Oval Fillister-Head ScrewF…Flat Head Screw N…Round Head Screw S…Set Screw FS-91S2-P EXPLODED VIEW
FS-91S2-P PARTS LISTThe specifications are subject to alteration for improvement without notice.DescriptionCode No.No.No. Code No.DescriptionWoodruff
91N.+M3X62435678N.+M3X22S.3X31-31-11-21-45-25-11-591N.+M3X62435678N.+M3X22S.3X31-31-11-21-45-25-11-5The specifications are subject to alteration for i
60N(FS-91S2-P)The specifications are subject to alteration for improvement without notice.Type of screw C…Cap Screw B…Binding Head Screw M…Oval Fill
FS-70S211.50cc/0.702cu.in.25.8mm/1.016in.22.0mm/0.866in.2.000~12.000r.p.m.1.1bhp/11.000r.p.m.580g/20.4oz.5839.620.3 96.4UNF5/16-2466.344.755.82150Dime
Remember that your engine is not a " toy ", but a highly efficient internal-combustion machine whose power is capable of harming you, or oth
Dimensions(mm) 14.95cc/0.912cu.in.27.7mm/1.09in.24.8mm/0.976in.2.000~12.000r.p.m.1.6bhp/11.000r.p.m.640g/22.6oz.DisplacementBoreStrokePracticalR.
Dimensions(mm) 14.95cc/0.912cu.in.27.7mm/1.09in.24.8mm/0.976in.2.000~12.000r.p.m.1.6bhp/11.000r.p.m.650g/23.0oz.DisplacementBoreStrokePracticalR.
C Copyright 2000 by O.S.Engines Mfg. Co., Ltd. All rights reserved. Printed in Japan.UNEQUALLEDQUALITYPRECISION&PERFORMANCEESTABLISHINGTHESTANDAR
NOTESThis engine was designed for model aircraft. Do not attempt to use it for any other purpose.Mount the engine in your model securely, following th
Take care that the glow plug clip or battery leads do not come into contact with the propeller. Also check the linkage to the throttle arm. A disconne
The O.S. FS-70S2, FS-91S2 and FS-91S2-P are built, like all O.S. engines, to the highest engineering standards, by a company that was established in 1
As supplied, the FS-70S2, FS-91S2 and FS-91S2-P have their throttle lever on the right hand side and needle-valve control on the left. However, where
10~15mmBecause these are powerful, large-displacement, single-cylinder four-stroke-cycle engines, it is essential to use very substantial engine mount
<FS-70S2, FS-91S2>NEEDLE-VALVE EXTENSIONThe needle-valve supplied with this engine is designed to accept an extension so that, when the engine
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