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Thread: piston burnt

  1. #1

    piston burnt

    i burned a hole in the #1 piston I was told that it was due to a lean condition,would backing out the high speed jet a full turn resolve this problem?


  2. #2

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    what ski do you have ???
    and welcome to the GreenHulk

  3. #3
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Welcome to the Hulk Studly! That may help, but you need to do some checks of the fuel system first. There are a number of fuel related issues that are assoc. with the age of these skis.

  4. #4
    i Have a 1995 Sl750

  5. #5
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    The most likely culprits would be a dirty fuel filter, or dirty carbs, kinked or rotting (internally) fuel hose, fuel shut off valve restricting fuel flow, or a fuel pump that's gotten weak. Any one of these could attribute to the hole you burnt. I would address all these before you burn another hole in the new piston. It's most likely not a simple, back out the adj screw fix. The ski is 12 yrs old and most likely had little upkeep done to it.

  6. #6
    im not sure of the history of this ski but i did replace the piston once and burnt it in about 3 hrs again.no adjustments after change

  7. #7
    i will check out the fuel system and let you know how i make out
    thanks for the welcome

  8. #8
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Quote Originally Posted by studly412 View Post
    im not sure of the history of this ski but i did replace the piston once and burnt it in about 3 hrs again.no adjustments after change
    DOH!!!!! You must always find the cause of the problem and remedy it, otherwise replacement will do nothing but fail again. What are you calling #1, front or back of boat? You should do a leak down test, it's possible you have a leaking crank seal or gasket.

  9. #9
    how do i do this leak down test?

  10. #10
    it is the aft cyl

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