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  1. #1
    xdrian's Avatar
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    Angry Spark plug losses tip WRF

    I have a seadoo 2009 RXTis 255

    lost compression on number 3 cyl found bent inlet valve and tip of spark plug missing suspect that was the cause of failure.

    Replaced valve and head gasket tested all good and only to find after 30mins ride went ruff again checked plugs again to find tip missing again WTF not sure if it was cyl 3 as didn't this could happen again.

    could it be a bad batch of plugs ?? or something else motor sounds ok no bad noise when running.

    compression 140 psi on all cyl

    have put new plugs hopefully new batch.

    anything to look for ??

    Thanks in advance


  2. #2
    Some guys say to re-gap plugs even if new. Can't see that this would cause the issue you're talking about though. That's a real shit and scary for many of us. Are you using regular recommended NGK's?

    Do you have stock pistons?

    Have you ever had the head skimmed?

  3. #3
    xdrian's Avatar
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    replaced with new set of NKG plugs
    all stock no head skimmed
    the tips, I mean the earth lug is where it breaks, about half way on the bend just gone the centre is all in tacked




    Quote Originally Posted by tornado34 View Post
    Some guys say to re-gap plugs even if new. Can't see that this would cause the issue you're talking about though. That's a real shit and scary for many of us. Are you using regular recommended NGK's?

    Do you have stock pistons?

    Have you ever had the head skimmed?

  4. #4
    Are you monitoring AFR?

    Are all three plugs the same colour when you compare the tips (what's left of them!)

    You could be burning them up (I know it's just one for now), could be running too lean.

    If you're running stock and lean, then a good place to start looking is the fuel system (pump, regulator, injector). Maybe they are starving you of fuel and pushing you lean to the point of knock and excess heat.

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  6. #5
    Tune? To much timing melts the strap off

  7. #6
    You have detonation

  8. #7
    xdrian's Avatar
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    I will take the new plugs out after an hour to see plug colour and compare
    mite try to put some injector clean in the fuel

  9. #8
    xdrian's Avatar
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    not sure how do you tell

    Quote Originally Posted by whittlebeast View Post
    You have detonation

  10. #9
    dpracing's Avatar
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    Quote Originally Posted by xdrian View Post
    not sure how do you tell

    Quote Originally Posted by whittlebeast View Post
    You have detonation
    losing a spark plug tip is one way you can tell.....

  11. #10
    Are you close to chris?
    As to use his logger and log ignition angle and knock per cylinder.
    Then you will see what´s going on.


    Quote Originally Posted by xdrian View Post
    not sure how do you tell

    Quote Originally Posted by whittlebeast View Post
    You have detonation

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