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  1. #1
    PWCToday Regular
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    Mechanicsburg, PA
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    Sea Doo 657...what is it??

    This came out of a box full of Sea Doo 657 parts....can you tell me what it is??!F2E0B231-5E64-4705-9B37-80F2B08BE2A9.jpeg

  2. #2
    PWCToday.com Is My Home Away From Home Myself's Avatar
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    Jun 2006
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    Re: Sea Doo 657...what is it??

    That is the rotary valve. Its a spinning, timed, intake valve. The Rotax uses that instead of reed valves.
    http://www.facebook.com/twinlakesjetskirepair

    '89 Kawi 650SX 42.4 GPS
    +3" stock pipe, ported ex. manifold, drilled waterbox, blueprinted pump, Ocean Pro ride plate

    '99 Yama GP1200 65U 61.8 GPS
    ported cylinders, matched cases, milled head, blueprinted pump, long ride plate

    '96 Seadoo HX 717 53.13 GPS
    light porting, massaged cases, lightened flywheel, port matched manifolds, Rossier pipe, stubby pump cone

  3. #3
    PWCToday Regular
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    Re: Sea Doo 657...what is it??

    Does it just use 1? How do you time it?

  4. #4
    PWCToday Regular
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    Re: Sea Doo 657...what is it??

    I see now. Pretty cool design.

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