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  1. #1
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    carbs leaking air?

    This is a new one for me. We re-assembled the top end of Kepneriphone's 750 today, and leak down tested it. Besides the badly leaking rear crank seal, I saw the carbs were leaking air. Not from the top or bottom gaskets, but from the throttle plate shaft and the choke plate shaft.

    How do I address the shaft seals on the 38mm SBN Mikuni carbs?


  2. #2
    seaobin's Avatar
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    That should not be a problem, as it is in the correct air path, right??? thought air leaks were only a problem after the throttle plate. since everyhthing above that is pre mix

  3. #3
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Technically, I guess you're right. On the other hand, I can't get an accurate leak down test with the shafts leaking air.

  4. #4
    SPEED KILLS, BUT YOU GET THERE QUICKER Keddano's Avatar
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    Kevin,The only way is removing the carbs and blocking the intake. Unless you could use some modeling clay or heavy,heavy grease around the shafts.

  5. #5
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Thanks for the tips Dan, but not sure that would work. Prob will remove the carbs.

  6. #6
    I always plate the intake manifold or the case where the intake bolts on ' one of our guys sticks racket balls in the intake manifold circular openings Z

  7. #7
    100 MILES OF HEAVEN AND I AM SMACK IN THE MIDDLE KEYZBUM's Avatar
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    Quote Originally Posted by ZMANN View Post
    I always plate the intake manifold or the case where the intake bolts on ' one of our guys sticks racket balls in the intake manifold circular openings Z
    +1 on the handballs (wanted it come from someone other than the hack,,,me )
    mattman

  8. #8
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    That would be me that recommends them. Still trying to figure out how the exhaust manifold ball shot out after it was even taped down...

  9. #9
    lol

  10. #10
    SPEED KILLS, BUT YOU GET THERE QUICKER Keddano's Avatar
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    Oh,your pressurizing the cases, Was thinking you were putting them under vacuum. Been a long week.

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