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OS 90FS parts needed

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Old 11-03-2011, 04:23 PM
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SCOTT42
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Default OS 90FS parts needed

Hello, I have an old OS 90 FS fourstroke engine that I need parts for but dont know where to get them at, I need mainly the oring set that goes with the pushrod sleeves, and a bearing thats 4mm X 21mm X 15mm for the cam, ive got everything else allready. Is the parts avliable?
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Old 11-04-2011, 06:22 AM
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Default RE: OS 90FS parts needed

Parts specific to the old O.S. FS-90 are no longer available from us or from O.S., in Japan. However, some parts are common to a lot of other engines. The o-rings for the pushrod tubes are universal. Here is the current stock number, which may work for you:

OSMG7372 24881824 O-RING IV/PRC #6H US$3.29 (4 per pack)

You'll have to do a search for the other parts. For the bearing, carefully measure the one you have and then check with one of the many bearing manufacturers for a replacement.
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Old 11-04-2011, 06:45 PM
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Default RE: OS 90FS parts needed

Thank you Bax, How can I tell if I have the timeing set right when I put the engine back together? Thats another thing I worry about.
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Old 11-07-2011, 07:03 AM
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Default RE: OS 90FS parts needed

The large timing gear with the inner teeth has a dot on it. The small inner gear on the end of the crankshaft also has a dot. Then the engine is at Top Dead Center, the two dots line up.
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Old 11-07-2011, 05:29 PM
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Default RE: OS 90FS parts needed

Thank you.
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