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Thread: What caused this? Piston failure

  1. 06-28-2009, 10:19 AM #1
    X-Runner
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    Default What caused this? Piston failure

    This is a Jet Ski engine (900cc 3 cylinder 2 stroke). What caused this piston failure? The head on this cylinder also looks almost like the top of the piston.

    BMW 750iL
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  2. 06-28-2009, 10:21 AM #2
    green91
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    Lean. Probably a jetting or sp plug issue.
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  3. 06-28-2009, 10:25 AM #3
    X-Runner
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    My thoughts exactly. Thanks.
    BMW 750iL
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  4. 06-28-2009, 10:26 AM #4
    blackshine007
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    Is it boosted? Look like you leaned out.

    K series 626. That's right. It's got a K in it.
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  5. 06-28-2009, 10:28 AM #5
    X-Runner
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    No its not. I'm thinking a carb gasket started leaking or something. Has less than 100 hours on the engine. All stock.
    BMW 750iL
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  6. 06-28-2009, 12:18 PM #6
    Barefoot
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    lean all day

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  7. 06-28-2009, 07:35 PM #7
    eraser4g63
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    Lean, or your Pre mix was WAY off.
    Try not. Do or Do not.
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  8. 06-28-2009, 08:30 PM #8
    Tech5
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    110% lean
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  9. 06-28-2009, 11:19 PM #9
    X-Runner
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    Quote Originally Posted by eraser4g63
    Lean, or your Pre mix was WAY off.
    Its injected.
    BMW 750iL
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  10. 06-28-2009, 11:41 PM #10
    NevrNufTorq
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    then the injector wasnt working properly or someone 'adjusted' your carbs and then one of your buddues decided to 'floor it' for say 20-30 min and that's what happens sorry, happened to me back in the day too
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  11. 06-29-2009, 09:54 AM #11
    X-Runner
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    So... how do you go about adjusting the carbs? It has 3 of them.
    BMW 750iL
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  12. 06-29-2009, 10:09 AM #12
    Tech5
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    sync and re jet
    Last edited by Tech5; 11-24-2009 at 12:15 AM.
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  13. 06-29-2009, 10:37 AM #13
    sikfricks
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    2 stroke jet skis are really sensitive i would never trust the injection just premix the gas this has happened to me numerous of times i learned the hard way p.s buy my jet ski
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  14. 06-29-2009, 10:39 AM #14
    X-Runner
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    You can't remove the injection system on this ski but I am going to premix the gas 50:1 anyways along with the oil system. Thats what Kawasaki recommended.
    BMW 750iL
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  15. 06-29-2009, 10:48 AM #15
    X-Runner
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    Quote Originally Posted by sikfricks
    2 stroke jet skis are really sensitive i would never trust the injection just premix the gas this has happened to me numerous of times i learned the hard way p.s buy my jet ski
    Check your PMs.
    BMW 750iL
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