kawasaki flat top pistons in seadoo 787
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  1. #1
    PWCToday Newbie holmes99's Avatar
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    kawasaki flat top pistons in seadoo 787

    i am just wondering if anyone could chime in on kawasaki pistons in the seadoo 787 engine. I am trying to figure out the best of the pistons to use.
    I am aware that the head is different.

    If anyone could chime in and guide me in the correct path way.

    thanks again

  2. #2
    Top Dog TMali's Avatar
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    Re: kawasaki flat top pistons in seadoo 787


  3. #3
    PWCToday.com Is My Home Away From Home TheJS440's Avatar
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    Re: kawasaki flat top pistons in seadoo 787

    Better than WSM?
    78 JS440
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    PWCToday.com Is My Home Away From Home wmazz's Avatar
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    Re: kawasaki flat top pistons in seadoo 787

    Probably not important, but when I changed from stock dykes rings
    to thin keystone rings I lost 10 psi. I don't know about the thick WSM
    rings.
    Horsepower == Speed, RPM != Speed



  5. #5
    Resident Guru mandriva's Avatar
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    Re: kawasaki flat top pistons in seadoo 787

    Quote Originally Posted by holmes99 View Post
    i am just wondering if anyone could chime in on kawasaki pistons in the seadoo 787 engine. I am trying to figure out the best of the pistons to use.
    I am aware that the head is different.

    If anyone could chime in and guide me in the correct path way.

    thanks again
    Yes you could!! I build many big bore artic cat 1132cc with piston yamaha...if the chime is right ..no issue....

    Next projet..i will build a big bore 787 to 840cc seadoo with piston gp760 (85mm)..
    xpl 951 rossier 7280rpm
    xp800 rossier 7250 rpm
    xp 720 race pipe rossier 7300 rpm

  6. #6
    PWCToday Newbie
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    Re: kawasaki flat top pistons in seadoo 787

    Quote Originally Posted by holmes99 View Post
    i am just wondering if anyone could chime in on kawasaki pistons in the seadoo 787 engine. I am trying to figure out the best of the pistons to use.
    I am aware that the head is different.

    If anyone could chime in and guide me in the correct path way.

    thanks again
    I use Wiseco kawasaki flat top pistons, and billet rossier head with flat domes in both my race boats. You will have to deck clyinders to get your squish right, ( 50-55 thousands ) if you dont the squish will be around 225-250 thousands. Rick Nolan

  7. #7
    PWCToday Regular twk4spd's Avatar
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    Re: kawasaki flat top pistons in seadoo 787

    I have a question about your question ---> WHY?

  8. #8
    PWCToday Newbie holmes99's Avatar
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    Re: kawasaki flat top pistons in seadoo 787

    flat top pistons produced better torque than a dome piston. And it is also something different to try.
    The fastest boat in my 800 open division is a 787 with kawi flat top pistons and it destroys everyone. And it is not just the rider

  9. #9
    Resident Guru mandriva's Avatar
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    Re: kawasaki flat top pistons in seadoo 787

    Quote Originally Posted by holmes99 View Post
    flat top pistons produced better torque than a dome piston. And it is also something different to try.
    The fastest boat in my 800 open division is a 787 with kawi flat top pistons and it destroys everyone. And it is not just the rider
    really?? Flat top pistons is better?
    xpl 951 rossier 7280rpm
    xp800 rossier 7250 rpm
    xp 720 race pipe rossier 7300 rpm

  10. #10

    Re: kawasaki flat top pistons in seadoo 787

    flat top power depends on the porting, a lot to do with roof angle and direction. kawi flat tops are 2 deg, the only true 0 degree flat tops i know of are riva dominator flat tops. they are around 200 a piece from wiseco.

    go read waxhead's 1100 blaster build he goes over all of this. or google flat top pistons pwctoday or flat top piston greenhulk
    1994 1100 SJ - Dead
    1996 spec hx
    "I'm going to be installing the hooker on my driveshaft in the next two weeks." -Element3488

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