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  1. #1

    1200 Middle Piston Seized!

    Hi & first post.
    Anybody here with experience of a middle piston seizure on their PWC?
    It happened to mine, was replaced, carby kits fitted, mixture made richer plus additional oil, then before it got to 10 hours, middle piston seized again - only this time putting a rod thru the block!

    Any info would be helpful.

    BTW the mechanic who did the original 1 piston rebuild did not pressure test the crankcase.


  2. #2
    WATER WOODY's Avatar
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    Welcome to GH....pics will be nice.

  3. #3
    Sorry to hear about the crank and crankcase man, that sucks.

  4. #4
    All hail the Chief! fullboogie's Avatar
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    Typically you're going to get piston seizure from one of two things: 1) lack of sufficient fuel; or 2) lack of sufficient oil.

    You're going to have to find out which one caused this.

  5. #5
    Moderator DrewNJ's Avatar
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    yea, pics would help a ton.
    Also, how much "additional oil" did you ad?

  6. #6
    Happily Self-Employed WFO's Avatar
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    #2 seizing probably because of an air leak

  7. #7
    Hydrotoys's Avatar
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    Quote Originally Posted by fullboogie View Post
    Typically you're going to get piston seizure from one of two things: 1) lack of sufficient fuel; or 2) lack of sufficient oil.

    You're going to have to find out which one caused this.
    ...or the crank was going out to begin with and your "mechanic" mis-diagnosed it wrong the first time.

  8. #8
    Flying Scotsman's Avatar
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    Quote Originally Posted by WATER WOODY View Post
    Welcome to GH....pics will be nice.
    Carbs may be the cause and could do the same thing to the rebuilt motor after you rebuild it
    It could easy be an air leak but you cant test that now.
    It could easily be a bad crank like hydro said too.

    You need new cases or a repair you need a new crank and at least 1 pison and rings.
    Cylinder could go either way.
    Your carbs need to be gone through and rebuilt if needed then properly set up for your motor.

    Pics would help a lot

  9. #9
    WATER WOODY's Avatar
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    Pressure test before you take it apart.

  10. #10
    Hydrotoys's Avatar
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    Quote Originally Posted by WATER WOODY View Post
    Pressure test before you take it apart.
    Tough to do with a rod thru the block.

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