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Thread: Carb leaking gas when gas on and not running

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    Senior Member Little Brute's Avatar
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    Carb leaking gas when gas on and not running

    Going to fix the carb leak issue when the gas is on and engine is off. I'm guessing the only reason it doesn't leak when running is that it is using gas fast enough to not let it leak. I do get a whiff of gas now and then when running it.

    What is the most likely cause? Stuck float shutoff?

    Can I get to what I need to by removing the float bowl on the bike or do i have to remove the entire carb?
    TW200 "Little Brute" is gone - Waiting to see what 2016 brings (WR250R/CRF250 RALLY/KTM390/Africa Twin or E-bicycle?)

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    Senior Member admiral's Avatar
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    Quote Originally Posted by Little Brute View Post
    Going to fix the carb leak issue when the gas is on and engine is off. I'm guessing the only reason it doesn't leak when running is that it is using gas fast enough to not let it leak. I do get a whiff of gas now and then when running it.

    What is the most likely cause? Stuck float shutoff?

    Can I get to what I need to by removing the float bowl on the bike or do i have to remove the entire carb?
    While it can be a stuck float, in my case it was a bad/old/cracked valve seat o-ring. There are lots of threads about it, but here is mine from this past spring. Hope it helps.
    https://tw200forum.com/forum/technica...mayflower.html

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    Super Moderator littletommy's Avatar
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    Most likely, it's what Admiral said... ^^^^^^^^^^above.
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    Senior Member Fred's Avatar
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    "Going to fix the carb leak issue when the gas is on and engine is off" - yes, best to fix all gas leaks while the engine is off, less fire hazard.
    Sorry to be such a terrible tease Little Brute, couldn't help myself.
    Say, where do you think the gas leak is showing up? Leaking from petcock, fuel line, carb body, float bowl cover gasket? Knowing this will help us help you.
    admiral likes this.
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    Senior Member Little Brute's Avatar
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    Quote Originally Posted by Fred View Post
    "Going to fix the carb leak issue when the gas is on and engine is off" - yes, best to fix all gas leaks while the engine is off, less fire hazard.
    Sorry to be such a terrible tease Little Brute, couldn't help myself.
    Say, where do you think the gas leak is showing up? Leaking from petcock, fuel line, carb body, float bowl cover gasket? Knowing this will help us help you.
    I'll be sure to shut everything off before sitting down with my cigar to get started...

    Leaking out of one of the hoses that run below the frame. My guess is a carb float bowl overflow, but not sure. Going out to look at it soon.
    admiral likes this.
    TW200 "Little Brute" is gone - Waiting to see what 2016 brings (WR250R/CRF250 RALLY/KTM390/Africa Twin or E-bicycle?)

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    Senior Member jbfla's Avatar
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    Quote Originally Posted by Little Brute View Post
    ...Leaking out of one of the hoses that run below the frame. My guess is a carb float bowl overflow,....
    Good guess. What Admiral said....bad o-ring on the float valve seat if it is a sloooow drip from overflow tube.

    If it is a fast drip, drip, drip....then the float valve may not be fully closing.

    Here's the result of an o-ring leak:




    jb
    Last edited by jbfla; 06-08-2015 at 02:49 PM.
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    Senior Member jbfla's Avatar
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    Another thought.....on occasion I have had to nearly destroy the float valve seat when trying to remove it.

    It is made of brass and is easily marred.

    The last time I coated the o-ring with a thin layer of petroleum jelly (Vaseline). When I had to remove it again, the float valve seat easily slid out.

    jb
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    Senior Member admiral's Avatar
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    I did that too. Hopefully the next time will be a long time from now!

  10. #9
    rbm
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    Make sure you check your oil to make sure there's no gas in it. If it was leaking good enough it could have run down the cylinder into the crankcase.
    Fred and jeffrolives like this.

  11. #10
    Senior Member Little Brute's Avatar
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    Quote Originally Posted by jbfla View Post
    Good guess. What Admiral said....bad o-ring on the float valve seat if it is a sloooow drip from overflow tube.

    If it is a fast drip, drip, drip....then the float valve may not be fully closing.

    Here's the result of an o-ring leak:

    jb
    Yeap, that's what it does. Slow dip. I thought it would be an easy fix. Doesn't do it when running either. Thanks.
    TW200 "Little Brute" is gone - Waiting to see what 2016 brings (WR250R/CRF250 RALLY/KTM390/Africa Twin or E-bicycle?)

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