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  1. #1

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    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?
    Cub brotherhood #113

  2. #2
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    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.
    Bill Baxter, Manager Hobby Services/Futaba Service/North America
    3002 N. Apollo Dr. Ste. 1 Champaign, IL 61822 USA
    Service Phone: 217 398-0007
    Email: hobbyservices@hobbico.com

  3. #3

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    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.
    Cub brotherhood #113

  4. #4
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    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.
    Bill Baxter, Manager Hobby Services/Futaba Service/North America
    3002 N. Apollo Dr. Ste. 1 Champaign, IL 61822 USA
    Service Phone: 217 398-0007
    Email: hobbyservices@hobbico.com

  5. #5

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    RE: OS 90FS parts needed

    Thank you.
    Cub brotherhood #113


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