Question about 1981 Yamaha XS 400

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Why does my carburator leak gas?

After i start my bike and shut it off, why does gas leak from my carburator?

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  • 113 Answers

You probably need to replace it.... :-(

Posted on May 13, 2014

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: carburator leaking gas out of over flow tube

Sounds like a stuck float. try gently tapping on side of carb near bottom where float assembly is located to see if it frees up if it doesn't you will need to remove and clean your carb and check your float adj.

Posted on Dec 28, 2008

neogil22
  • 36 Answers

SOURCE: sumthing is wrong with the carburator

hi,
to get a good combustion inside the engine, you(engine) needs fuel-air mixture, since it leaks fuel the mixture is too rich on air. Where does the carb leak? maybe it's just the connection that leaks...I mean where the fuel line connects to the carb, If it leaks there it also sucks in extra air instead of fuel, and therefor the engine doesnt run smooth, choke or no choke, that makes no difference. Check that and if it leaks there just change out the fuel line with a new hose.
It could also be the little rubber ring that seals of the carb, If it leaks from the top of the carb...it's the little ring. Take off the top of the carb and check the condition of the ring, if faulty.. replace it with a new one.
Hope this helps....can be pretty dangerous riding around with a leaking carb... Good luck, Gilbert.

Posted on Mar 05, 2009

mb50sa
  • 79 Answers

SOURCE: 1979 dt 175 lower fuel overflow line is leaking

Two possibilities.
1. Your float needle is leaking (most likely). Remove the carb, remove the float bowl. You will see the float itself and it has a tang that touches the float needle. Remove the float and inspect the needle and its seat for dirt or wear. You could try gently tapping the float bowl first, as this may dislodge and dirt, but thats a short term solution.
2. The float level is incorrect. You will need to bend the float tang to adjust. However, find out the float height for your bike first.

Posted on Jun 22, 2010

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You need a proper carb cleaning. Not some run in the gas tank sh*t. If the tank wasn't full when parked, chances are there is rust in the fuel system to get this out you need to disassemble the carburetor and thoroughly clean it.

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Hey, I had shut down my bike just as I had pulled up to my garage. My low fuel lite had been on for qiute a while before that. so when I had gone back to start the bike, It would not start. So 2 week's...


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This problem of cutting off is a carburator/fuel related issue.
I guess the fuel might not be pouring in to the float chambers faster enough.
Try this, remove the air -filter and thn start the engine and as it is about to cut off, block the intake(by your palm) at the carburators and see what happens...taking care not to over block it as the gas may pour out and also flood in the combustion chamber rendering it to shut off due to to much fuel.
If it does respond and stay running thn the problems is tht the carbs are not getting the gas as required and probabley you may have to recheck the float level, the float pin,carb synchro, air-fuel mixture.
Check the pet- c o c k too.
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Valve might be stuck in carburator and leaking from excess line


If it has dirt stuck in the needle and seat try tapping on the carb with a screwdriver handle. If that doesn't work shut off the fuel and run the bike until the carb runs out of gas. Then turn the gas back on and start it back up. That should loosen the dirt. Last resort, take apart the carb and clean it out.

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