Seadoo 1165cc triple port 8mm stroker
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  1. #1
    Frequent Poster scensor's Avatar
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    Seadoo 1165cc triple port 8mm stroker


  2. #2
    Top Dog JC-SuperJet's Avatar
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    Re: Seadoo 1165cc triple port 8mm stroker

    Question regarding Photo #10 of the Exhaust Port:

    At the Bottom of the Exhaust Port, there is a "Step" caused by the Sleeve to Cast misalignment. Did the Sleeve get ported & blended to the Cast or is this how it is currently running?

    I ask because a "Step" will reduce Flow Performance...

    Seadoo Exhaust Port Sleeve Mismatch.jpeg

  3. #3
    Frequent Poster scensor's Avatar
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    Re: Seadoo 1165cc triple port 8mm stroker

    So great question both my 6mm and 8mm triple ports have it. And this engine specific came like this after miller changed sleeves. No it’s not a mismatch, it’s like this due to the extra ports won’t create enough pressure in the c. Chamber thus they make main exhaust with this at bottom side to stop loosing lows. Highs you won’t loose any rpm from that. And also due to the stroke if you remove it piston skirt won’t cover that spot. Due to the 4mm piston going higher.

  4. #4
    PWCToday.com Is My Home Away From Home wmazz's Avatar
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    Re: Seadoo 1165cc triple port 8mm stroker

    Nice looking engine!

    Did you have the 8 (long) cylinder studs custom made, or was that
    something Miller made?


    Quote Originally Posted by scensor View Post
    And also due to the stroke if you remove it piston skirt won’t cover that spot. Due to the 4mm piston going higher.
    IMO, this is more important. All kinds of problems occur on reed
    engines (depending on the engine) if that gap is too big.

    But the miss-match of the piston @ bdc to the exhaust port (sleeve
    height) is something Kawasaki featured on the 1986 KX250. But in this
    case (KX) the entire exhaust port was shifted upwards ~4-5mm.




    Bill M.

    Are those Boost Bottles (connected to the intake) in the picture
    2nd from the bottom?
    Horsepower == Speed, RPM != Speed



  5. #5
    Frequent Poster scensor's Avatar
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    Re: Seadoo 1165cc triple port 8mm stroker

    No these are miller made studs !!!!

  6. #6
    PWCToday.com Is My Home Away From Home wmazz's Avatar
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    Re: Seadoo 1165cc triple port 8mm stroker

    Finding new studs for the PJS Super Cylinder was difficult
    (impossible), I thought if they were custom made you might
    have a source (vendor) for other studs.


    Bill M.
    Horsepower == Speed, RPM != Speed



  7. #7
    Resident Guru 800X-4rider's Avatar
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    Re: Seadoo 1165cc triple port 8mm stroker

    Any idea on power?


    Sent from my iPhone using Tapatalk

  8. #8
    Frequent Poster scensor's Avatar
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    Re: Seadoo 1165cc triple port 8mm stroker

    Depends on pipe, compression i run and fuel
    low to 210 up to 240

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