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  1. #1

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    Jun 2008
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    Polaris SLT750 Engine Problems

    I recently purchased a stock unmolested low hour SLT750 with a locked-up motor from an eBay auction. After disassembling the engine I discovered an overheated shattered melted PTO piston that separated from the connecting rod and broke off one side of the the cylinder liner skirt. The attached photo's show the damage to the piston and cylinder.
    http://s542.photobucket.com/albums/g...albumview=grid
    Any ideas on what caused the overheating ans subsequent meltdown of the PTO piston. The other cylinders are undamaged.


  2. #2
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    If that piston cracked in half like that, I'd bet it was hydrolock.

    You need to inspect that crank VERY well for signs of bearing rust, and index the crank.

  3. #3

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    I forgot to mention that the bottom end is seized. I am in the process of installing a used short block from another jetski. The guy who owned the Jetski said he was driving across the lake and the engine died. Still trying to understand how the pistion fried and shattered!

  4. #4
    FLjoyrider's Avatar
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    had a piston do that on a 3 wheeler back in the day.. still no explanation

  5. #5
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Quote Originally Posted by kwu3757 View Post
    I forgot to mention that the bottom end is seized. I am in the process of installing a used short block from another jetski. The guy who owned the Jetski said he was driving across the lake and the engine died. Still trying to understand how the pistion fried and shattered!
    Hydrolock.

    Water doesn't compress, so something else has to give. Normally the piston or connecting rod.

    Maybe the same water that cracked the piston sat in the ski long enough to seize the baarings from rust?

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