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  1. #1
    PWCToday Newbie
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    Seadoo 657x performance

    Hey guys need some advice from the old schoolers building up an older 657x with choice of a Coffman or psi pipe and a west coast head with 34cc domes, curious as to which pipe is better and is 34cc ok for pump gas 93?

    I'm doing wave jumping so all I want is power down low if i could get some of past setups people have run that would be great as well as what size jets did you run too thanks for the help in advance

  2. #2
    PWCToday.com Is My Home Away From Home Grumpy Old Guy's Avatar
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    Re: Seadoo 657x performance

    Dont bother

  3. #3
    PWCToday.com Is My Home Away From Home WFO Speedracer's Avatar
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    Re: Seadoo 657x performance

    +1, the 657x is pretty strung out as it is
    Get your Fat Dudes T-shirts right here PM me for details !

  4. #4
    PWCToday.com Is My Home Away From Home Matt Braley's Avatar
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    Re: Seadoo 657x performance

    Those Coffman and PSI pipes were developed for a 587 anyway so they'd probably be a step or two backwards. I had one with an APE pipe and 44's that ripped. I had another with re-jetted carbs and a Factory pipe that blew up quickly.

  5. #5
    PWCToday Newbie
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    Re: Seadoo 657x performance

    Ok so it's safe to assume that there weren't many pipes made for the 657x? Also would i be able to tell if it were for a 657x or other engine?

  6. #6
    Frequent Poster
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    Re: Seadoo 657x performance

    The factory pipe by far makes the most power, but has a small stinger that makes them easy to hole a piston. But if you open the stinger up 2mm it gains low end and it doesn't hole Pistons so easy.
    The other two pipes you mentioned are not worth time to bolt on.
    The Rossier pipe worked good on that as well.
    If you can find one Russ linsky made a few awesome pipes for that setup.
    Just remember it's a small displacement rotary valve motor it's never gonna be snappy so don't over do it with comp to get bottom end and hole a piston like so many did
    When I doubt hold button till your out!

  7. #7
    PWCToday Newbie
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    Re: Seadoo 657x performance

    Ok factory pipe it is that I'll be on the hunt for one, sell off the ones I got, and I was only going to run 180lbs at the most anyway

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