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Thread: piston pics

  1. #1

    piston pics

    Hi,

    What do you think about these pistons? rich/lean??

    these are from a twin carb GP800R

    Front piston is the darker of the two and the lighter one is the rear.

    Thanks
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  2. #2
    Happily Self-Employed WFO's Avatar
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    1st is a little, 2nd is just right

  3. #3
    a little lean?

    would you say safe to run or richen one eighth/quarter

  4. #4
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    Open that screw up a bit

  5. #5
    thanks....i take it you mean the high speed screw

  6. #6
    Happily Self-Employed WFO's Avatar
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    Quote Originally Posted by gp8r View Post
    thanks....i take it you mean the high speed screw
    yup

  7. #7
    Moderator DrewNJ's Avatar
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    I'd take the highs all the way in first and count how many turns your currently at. If opening them up any more takes you over 2 turns out then it's rejet time...

    Is this a stock ski?

  8. #8
    gp8r, didn't you have a head gasket problem causing low compression on that cylinder? If so, you can not determine the fuel mixture from piston wash on that piston until it has been running correctly. How many turns out on the high speed needle are you on the PTO piston?

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