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Thread: Gass from leaking carb on '89R100GS

  1. #1
    Registered User
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    Jun 2009
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    Question Gass from leaking carb on '89R100GS

    I have had two unexplained leaks from one of the carbs on my '89 R100GS. It lasts for a few minutes with fuel leaking at a fairly constant rate and then stops, sometimes after I turn off the valve and back on--not sure? A dealer told me that this happens once in awhile and made it sound like it was no big deal--any thoughts?

  2. #2
    Rideoften
    Join Date
    Nov 2004
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    Orlando, Fl.
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    Any time fuel is leaking IS a big deal. Drop the float bowl and clean out any trash that may be preventing the needle from shutting off the flow of fuel. The float itself may need replacing and or the needle and seat. Whatever it takes to make it seal properly.

    Ride Safe,
    Mike

  3. #3
    Registered User krpntr's Avatar
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    Jan 2010
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    Mt Vernon WA
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    408

    leaky carb

    I had that problem once. Pulled the needle valve and sure 'nuff a tiny bit of tank liner on the needle. I cleaned it off and replaced the needle, and no more leak. I then replaced the inline filter and cleaned the petcock filter. It was so crudded up I was surprised I could get any gas through at all.

  4. #4
    Registered User
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    Quote Originally Posted by Krpntr View Post
    I had that problem once. Pulled the needle valve and sure 'nuff a tiny bit of tank liner on the needle. I cleaned it off and replaced the needle, and no more leak. I then replaced the inline filter and cleaned the petcock filter. It was so crudded up I was surprised I could get any gas through at all.
    +1 especially the needle valve. Also empty tank, and rinse out with ATF. See what comes out. Any ATF residue will burn fine.
    Also, how are your floats? Are they fuel sodden? The ethanol attacks these, and they sink, letting too much fuel in.
    If it were my bike, and I didn't know the recent history of the floats, I would replace both of them, along with the needle valves (which do wear), out of hand. This situation is unlikely to improve on its own

  5. #5
    Rally Rat
    Join Date
    Jul 2007
    Location
    New Jersey
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    302

    Talking

    And carry spare carb bowl gaskets. Half the time I close up the bowls, the gasket gets pinched and leaks later on.

    Your dealer doesn't think its a problem because HIS boots don't smell like gasoline.

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