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Thread: OS 40 FSR


  1. #1

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    OS 40 FSR

    Having taking apart to replace bearings, just checking in what direction the arrow on top of the pistion should face?

    Dave

  2. #2
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    RE: OS 40 FSR

    The arrow points towards the exhaust port.
    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 40 FSR

    Thank you. Just wanted to be sure.

  4. #4
    BigTeeEldorado's Avatar
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    Help needed

    I am having a really tough time locating a piston and ring for a 1975 era OS 40 FSR. I have not even been able to identify a part number for the piston. The OS website has the liner but no piston information. I've seen scattered reference to clones but still nothing solid to help me.

    The ultimate goal of course is to find those two parts. Any help is appreciated.
    Tony (Big-Tee)

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    All my model airplanes have an expiration date. I just haven't been told what that date is!!

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    35.862645, -114.940789

  5. #5
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    Parts and part numbers:

    .40 FSR Ring:

    PIston 24803215
    Ring 24803412
    Liner 24903106

    .40 FSR ABC

    Piston/liner assembly: 24903002

    These are all discontinued parts, You may be able to locate parts through someone who deals in old engines and sells to the collectors' market. Some of these people advertise in the classified section of the model magazines. An internet search may yield some results. Posting a "parts wanted" ad in the RCU Marketplace may help.


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