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  1. #1
    rob2337's Avatar
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    Opinion on Piston Failure

    Just wondering if the experts could give their opinion on this piston failure. Granted this is not a Polaris PWC engine, but it’s still a 2-smoke! So far my Polaris PWC has never failed
    I think this was running way lean and started to melt a hole through the piston. Anyone else agree?
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  2. #2
    seaobin's Avatar
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    wow, when you do it, you do it right/.

    I would agree, taht you went lean for a long time. Overheated the pistons, but before the piston got hot enough to liquify, it seized and then when you restarted it, it ate all the pieces that you chunked out of the sides
    JMHO

  3. #3
    rob2337's Avatar
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    Well I bought the machine like this so I can't be blamed, but the guy who had it before was special.

    I pulled the carbs, he must have reversed the carbs as the jetting was reversed for each cylinder. One carb had mud in the bottom, and the other one the main jet was clogged solid.... never in my life have I seen carbs this bad....

  4. #4
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    It does appear to have been running lean and starting to hole through the center.

    The edges could be severe deto, as that is were it most likely shows up.

    Mud in the carbs sounds like it was sunk. Thoroughly inspect the crank for rust or being out of phase. If it had water in it and he cranked it over, it may have meesed up the timing.

  5. #5
    rob2337's Avatar
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    Thanks for all the help. Sank...probably not as this was from a skidoo. Crank was not rusted but the rotary gear was damaged, so it had to be pressed apart and fixed.

  6. #6
    Race, wreck, repeat delagem's Avatar
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    Hmm, I've seen more Skidoos pulled out of ponds than I've seen Seadoos sink.....

  7. #7
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Quote Originally Posted by delagem View Post
    Hmm, I've seen more Skidoos pulled out of ponds than I've seen Seadoos sink.....
    I know of a few guys that sank sleds with the infamous, "watch this"!!


    How else would you explain the mud in the carbs?

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