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  1. #1
    srjrinc's Avatar
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    What happened to this piston?????!!!!

    Does anyone know what happened to this piston???? It's from a 03 Waverunner XLT 1200 with the PV motor.
    I bought this ski as a project but I think im a little my head, I've seen some thing like this on a GP 800 that I
    rebuilt, but that was caused by an oil pump failure......Any suggestions? Detonation? Cheap Gas? I don't know.
    The top of the piston has been basicly chipped off all the way around. I'll see if I can post that later. HELP!
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    Last edited by srjrinc; 08-30-2012 at 05:04 PM. Reason: wanted to add second pix


  2. #2
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    Looks like it was a lean, no piston wash and white. Not good

  3. #3
    silvercrxsir's Avatar
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    Ya lean for sure,could be due to a failed crank seal,I would def pressure test after reassembly

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  5. #4
    The piston skirt and top banged up. Is that the mag end or front piston. Is engine stock? I had a few engines that came apart. Each time I was told engine running to lean.

    I know that adjusting carbs and checking plugs needs to be done. How are adjustments performed with engine assembled in hull? Carbs are under exhaust and getting to mixture screws can't be done be a human.

    If spark plugs are burning lean and clean can a cooler spark plug be installed?

  6. #5
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    a spark plug wont help you get more fuel to the motor. lean is lean/ need more fuel

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