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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
    PWCToday.com Is My Home Away From Home 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
    -Ocean Pro Finned Ride Plate
    -Westcoast Intake Grate
    -SCR Ported Cylinder
    -Westcoast Exhaust Manifold + Pipe
    -Mariner Waterbox
    -Primer
    -SBN44
    -Quick Steer
    -Skat~Trak 16.5 SS Impeller

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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)..
    Rossier 7250 rpm
    110 mid pipe/200 stinger
    Head 43cc/45 squish
    Strak swirl 17/22

  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?
    Rossier 7250 rpm
    110 mid pipe/200 stinger
    Head 43cc/45 squish
    Strak swirl 17/22

  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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