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  1. #1
    emilbolboaca's Avatar
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    Hole in #1 piston

    This is a 01 gp1200r
    I got this engine with water sitting in it for few months, so I changed the crank, pistons, rings. It is premix, it has riva heads and the carbs have T handles, forgot the jets size.

    This is what happened:
    When the guy put it second time in the water he had some gas in the tank, two lines and he added 5 more gallons without oil, he forgot the oil. When he realized that he burned about 5 gallons of gas. He put the oil and more gas premixed and he used the ski until it start to run bad. When I pulled the head I found a hole in #1.

    Did this happen because of no oil or is something else, a leak or carb problem because he used the ski for a while after he refilled it?

    Thanks


  2. #2
    emilbolboaca's Avatar
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  3. #3
    THE PLATE MAN JIM'S PERFORMANCE's Avatar
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    looks very lean.

  4. #4
    emilbolboaca's Avatar
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    Quote Originally Posted by JIM'S PERFORMANCE View Post
    looks very lean.
    I know, can this be because of no oil?

  5. #5
    Moderator DrewNJ's Avatar
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    Quote Originally Posted by emilbolboaca View Post
    I know, can this be because of no oil?
    No, what your showing IMHO looks like running lean either because of an air leak somewhere or your off on the jetting in the carbs.

  6. #6
    gp1200rider's Avatar
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    ?

    To much oil ratio in premix can lower gas octane and cause detonation sense this is the hottest running cylinder .

  7. #7
    THE PLATE MAN JIM'S PERFORMANCE's Avatar
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    Quote Originally Posted by DrewNJ View Post
    No, what your showing IMHO looks like running lean either because of an air leak somewhere or your off on the jetting in the carbs.
    +1

  8. #8
    emilbolboaca's Avatar
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    I was afraid of an air leak but first I will check the carbs. I will keep you posted.

  9. #9
    emilbolboaca's Avatar
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    Carbs are stock with acc pump and choke still in. The caps are removed and the mixture screws are stuck, frozen solid, I don't know how many turns are now. Is there a way to get them out? And anybody knows the jetting for riva heads?

    Thanks

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