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Thread: Carb problem

  1. #1
    Senior Member assquatch20's Avatar
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    I was heading to the store today when it started sputtering like it needed gas, I pulled the clutch in and it died. Checked the gas, was fine, the petcock was already on reserve so I put a little more in but got nothing. The thing won't start. I've got spark, and I've got fuel partly because I tilted the carb and some drained out and the petcock isn't blocked. I'm guessing it's a jet, but I've no idea how to really adjust them or anything.



    If there's any other suggestions as to what it might be or an explanation on what I need to do to get it cleaned out, I'd appreciate it.

  2. #2
    Banned qwerty's Avatar
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    Quote Originally Posted by assquatch20 View Post
    I was heading to the store today when it started sputtering like it needed gas, I pulled the clutch in and it died. Checked the gas, was fine, the petcock was already on reserve so I put a little more in but got nothing. The thing won't start. I've got spark, and I've got fuel partly because I tilted the carb and some drained out and the petcock isn't blocked. I'm guessing it's a jet, but I've no idea how to really adjust them or anything.



    If there's any other suggestions as to what it might be or an explanation on what I need to do to get it cleaned out, I'd appreciate it.


    Just because there is gas in the carb doesn't mean gas is in the engine. Spray abit of ether (starting fluid) in the air intake nozzle and see if the bike cranks, then quits. If so, you have a fuel problem.




  3. #3
    Senior Member assquatch20's Avatar
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    Quote Originally Posted by qwerty View Post
    Just because there is gas in the carb doesn't mean gas is in the engine.


    That's what I figure, but what in the carb would be blocked to keep it from getting in?

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  5. #4
    Senior Member elime's Avatar
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    The float can get stuck in the up position. Lightly tap the carb with something metallic and sometimes that will jar it lose.
    Long live the internal combustion engine!

  6. #5
    Senior Member jbfla's Avatar
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    Qwerty, it's your turn. You know more about carbs than I do....



    AQ20,



    Just some guesses:



    You have a tank of bad gas.

    Water has built up in the tank or carb...from ethanol gas.

    Crud floating around in the carb float bowl has clogged the float valve.

    Float bowl valve/needle is stuck in the closed position.



    Things to try:



    Try Tony's suggestion, tap the side of the float bowl.



    Like Qwerty says, spray some starting fluid or carb cleaner in the airbox, and try to start...remove airfilter first.



    Open the float bowl drain screw and drain the gas from the float bowl into a glass jar. Look for water/crud.



    Pull out the choke fully, and try to start the bike. If it runs on full choke, but dies when you push it in, most likely the float valve is clogged.



    See these these threads:



    https://tw200forum.com/index.php?/top...g-for-dummies/



    https://tw200forum.com/index.php?/top...-in-crankcase/



    jb
    2018 Triumph Street Twin..............2016 CB500F
    2014 XT250 ..................................2008 H-D Softail Deluxe
    2008 SV 650..................................2007 DR 650..

  7. #6
    Senior Member assquatch20's Avatar
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    Well I gave the bowl a sharp tap with a wrench and it'll start for just a second with the choke on, but not without. This is a step in the right direction.



    Btw kickstart + flip flops doesn't equal a good time.



    Also it's the old style carb, for what it's worth.

  8. #7
    Senior Member assquatch20's Avatar
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    Got it started and idling. Pulled the carb and blew it out a bit. Having a tough time getting it back in. Any tips for this?



    EDIT: I think the boot from the airbox is so stiff that it's causing the carb not to slip in right. Is this a common problem? If so I'll go ahead and order a new one.

  9. #8
    Senior Member jbfla's Avatar
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    Quote Originally Posted by assquatch20 View Post
    ...EDIT: I think the boot from the airbox is so stiff that it's causing the carb not to slip in right. Is this a common problem? If so I'll go ahead and order a new one.


    Yes it's common for the rubber boot to shrink over time.



    Try coating the inside lip of the rubber boot with vaseline (petroleum jelly).



    Insert the carb into the engine side first, then try to work the air box end into the rubber boot.



    jb
    2018 Triumph Street Twin..............2016 CB500F
    2014 XT250 ..................................2008 H-D Softail Deluxe
    2008 SV 650..................................2007 DR 650..

  10. #9
    Senior Member assquatch20's Avatar
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    Well I got it back in with a lot of twisting and squeezing but now the thing won't start. I'm thinking pull it out and give a proper cleaning and replace that damn airbox boot. It's still not sealed up very well because of the shrinkage.

  11. #10
    Senior Member assquatch20's Avatar
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    I got the float bowl off. Now what?

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