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Thread: Carb Leak

  1. #1
    Senior Member Tjmay's Avatar
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    Carb Leak

    Before I jusr jump into a device that I know little about, Iím not ashamed to ask for help.

    My carb is dripping fuel from the drain at the bottom of the bowl. A pretty fast drip at that.


    My first blush is a stuck float valve but donít they usually get stuck closed and not open?

    What is the sequence of things to check?
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  2. #2
    Senior Member GCFishguy's Avatar
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    They often stick open....that's one of the reasons you hear of people religiously turning the fuel petcock to OFF when it's going to be parked for more than a few minutes.

    Any time a float (okay, needle valve) sticks open (more than likely a little piece of schmutz holding it open, rather than it 'sticking open'), always always always check and see if the cylinder is also full of gas, and check the oil as it may be full of gas that went past the rings. Check and remedy those 2 things as well before trying to start it.

  3. #3
    Senior Member RockyTFS's Avatar
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    First, shut off the gas and remove the drain screw and look to see if the tip is buggered (easiest things first!). If not, take the float bowl off and use some canned air to get into the needle valve and see if that fixes it. You can easily test with the bowl off. If that isn't it you will have to remove the float and the seat. Look at this: https://tw200forum.com/forum/technica...ification.html
    Photo 11.

    And this for the delicate job of float removal: https://tw200forum.com/forum/technica...tor-float.html

    While you are at it, replace the bowl screws (JIS!!!) with SS Allen screws so it's much easier next time.
    Rocky
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  5. #4
    Senior Member Gastone165's Avatar
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    If the drain at the bottom of the carb is leaking, the drain screw is not sealing. As it leaks the carb float falls and the carb refills. When the lower drain is closed it shouldnít leak no matter how full the carb is. Do as Rocky suggests and remove the bowl and check the drain screw for debris or damage. Replace for less then $4.00 on-line at boats.net. You can replace those bowl screws with Allenís while youíre at it. Mine used to leak as well. This fixed it.
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  6. #5
    Senior Member TopPredator's Avatar
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    If you have a TW Maintenance manual...see float adjustment
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  7. #6
    Senior Member Tjmay's Avatar
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    Great suggestions and the links to the older posts showing float removal are really helpful.

    Still, while Iím not usually timid, donít think Iím ready yet to attemp a carbectomy...
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  8. #7
    rbm
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    Dive in, it really is as easy as reading about it.
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  9. #8
    Senior Member RockyTFS's Avatar
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    Quote Originally Posted by rbm View Post
    Dive in, it really is as easy as reading about it.
    If you have the right tools and a considerable amount of patience....
    Rocky
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  10. #9
    Senior Member jbfla's Avatar
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    Quote Originally Posted by Gastone165 View Post
    ....... When the lower drain is closed it shouldnít leak no matter how full the carb is........
    Don't mean to be rude but this is not always true.

    The bowl overflow tube also drains from that same opening at the bottom of the float bowl.




    The leak from the overflow tube can be caused by an open float valve or a leaking o-ring on the float valve seat.


    Here is a leak caused by a bad o-ring:



    Here was the problem:




    Even if the float valve is closed, fuel can seep through the faulty o-ring and around the valve seat causing the bowl to overflow.

    Turning off the petcock when the engine is stopped can stop the leak, but doesn't cure the problem.

    Depending on how severe the leak is, a running engine will burn more fuel than will leak past the valve seat..... but having fuel dripping on a hot engine is never a good idea.


    jb
    Last edited by jbfla; 02-08-2018 at 11:57 PM.
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  11. #10
    Senior Member Gastone165's Avatar
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    Jb, no harm no foul. 😀
    Mine was leaking there and after cleaning it it stopped. Itís been a while and I forgot about the little snorkel tube sticking up from the bottom of the bowl. My bad.
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    1972 Yamaha DT 175, 1974 Kawasaki 125, 1976 Suzuki TM 250, 1979 Yamaha 750, 1977 Husquvarna 360, 1979 Husquvarna 250, (2) 1980 Suzuki RM 400ís, 1971 Husquvarna 400, 1983 Honda V65 Magna, 1987 Suzuki 230 Quad, 1987 TW200, 1990 TW200, 1996 Honda XR 650, 1998 Yamaha 300 King Quad, 2000 Harley Davidson Heritage, 2006 Kawasaki KLX 250s, 2007 Arctic Cat 650 Quad, 2010 Polaris Sportsman 850 Quad, 2006 Yamaha Grizzly 660 Quad, 2002 TW200, 1995 TW200, 2008 TW200, 2016 TW200.

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