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Thread: Seadoo XP800 96

  1. #1

    Seadoo XP800 96

    So I picked up a new to me XP 800 it was apparently rebuilt. Which u can clearly see new "OEM?" pistions Elko 2096. Compression is 105-110psi even. So I checked squish well with a 6 hole base gasket it came in at 1.61mm. ok so removed the jugs cleaned off all gasket put jugs back on metal to metal, head on, checked squish. Well now it's 1.01mm. makes sense since gasket was 0.60mm. so what exactly am I missing here to get the correct squish.

    82mm bore yet. New sleeves apparently.

    Maybe I'm missing something some one please shed some light for me thanks


  2. #2
    ncdoo's Avatar
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    What exactly is your question? The thicker the base gasket, the greater squish. I think you've shown that.

  3. #3
    How can I get my squish back to the factory 0.47-0.68mm squish? Also how could it be that far off?

  4. #4
    That measurement in not in mm but good ole American. That's your issue just convert it.

  5. #5
    Guess that's what got me. Comming from German cars easy thing to do.

    So metal to metal is 0.0398 squish. A 6 hole gasket is 0.0236. which would be 0.0634in. at the top end of spec. Shouldn't be seeing comp at 105psi in my opinion then.

    Now would using a base gasket of 3hole or 0.0118in. netting a possible squish of 0.0516in. would the 0.0074in make any noticable difference or would I need to shave the head plate down say 0.015-0.020in and use a different base gasket in accordance with new squish. Trying to get back to the magical 150psi range.

    Thanks

  6. #6
    ncdoo's Avatar
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    If your ski is stock and you only have 105 psi then either your gauge is wrong or you've got another problem, i.e. rings, bore,etc? Changing the base gasket is not going to bump up the compression that much. You need to fix your compression problem and then get the squish correct using the appropriate base gasket.

  7. #7
    Jugs were replaced and standard pistons used. Bore is 82.06mm new rings were used during the rebuild. I can see that. I didn't do the rebuild myself but I see it was done. I'm sure it had less then 20hours on the motor.

    Maybe check pistion to wall clearance. Maybe a quick hone and rering.

    What else would u suggest looking at?

  8. #8
    ncdoo's Avatar
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    Before you do anything, try a different comp gauge. And check the ring end gap.

  9. #9
    Used 1 push in style guage and 2 different harbor ones same reading. Wish I has a bluepoint or snapon one. Same readings. Guages read car fine up to 200psi.

  10. #10
    Ok another updated with more information so I don't forget and shed some light.

    Cylinder to wall clearance. 0.0045in
    Ring gap @ top of cylinder 0.016in
    Ring gap @ bottom of cylinder 0.016in

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