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Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
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  #1  
Old 7 Feb 2010
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leaking fuel overflow
can anyone tell me why my fuel overflow tube leaks when i shut off my 94 xt600? i left it for about 6 hours and there was about 1/4 cup of fuel that had spill out into a bucket.

thanks in advance.
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  #2  
Old 7 Feb 2010
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sorry can't help you there...
well I have the same problem on my KTM LC4 640 / 2002 with the 30Lt tank, and the matching vacuum pump even if all tabs are turned off carefully... I tried to adjust the needle valve and the float of the carb, even replaced the needle valve for a new one, but still no luck... loosing fuel while parked up...
On the other hand I'm not sure if it got some thing to do with the tilted carb regarding the side-stand only support...

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Old 7 Feb 2010
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Angelglo, when you say "bike shut off", do you mean fuel tap turned off - or is it a vacuum tap?

If its an "on/off" tap it should be turned off every time its parked up. If you are doing this, take the fuel pipe off the tap and turn it on, then off, and see if it stops the flow immediately. If not it needs a repair kit or replacing.

You 100% sure its out the overflow, and not weeping out the bowl and running down the overflow pipe?


This still ins't the reason fuels coming out of the overflow. This is due to the fuel needle valve leaking. Even if you replaced/cleaned it, there must be a slight weep due to wear/bad alignment or (best bet) dirt. Are you runnin g a fuel filter in the fuel pipe - if not probably worth it, them clean/check the needle again.

Good luck.
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Old 7 Feb 2010
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Perhaps your float bowl is sticking or incorrectly set up.

Set the float height as per book specification.

Old school method could be to tap the float chamber with something like a screwdriver and see if it stops. Not a permanent solution though.
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Old 7 Feb 2010
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Quote:
Originally Posted by tedmagnum View Post
Old school method could be to tap the float chamber with something like a screwdriver and see if it stops. Not a permanent solution though.

SCEWRDRIVER, my arse - used to be a 3lb hammer, at the very least
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Old 7 Feb 2010
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Originally Posted by Pigford View Post
SCEWRDRIVER, my arse - used to be a 3lb hammer, at the very least
LOL... What were you riding ?? A sherman tank ??
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