Question about 1979 Yamaha XS 650 F

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I have completely rebuilt the petcock but I still have a serious gas leak. Can you help?

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Did you replace the vacuum diaphragm on the back of the petcock? That is usually the cause of fuelcock leaks on Yamaha's. Yamaha only offers the diaphragm in the complete petcock assembly. The only way to get a diaphragm separately is in the K&L petcock rebuild kit. Unless your leak is dirty carb/bad needle related and not petcock related.

Posted on Aug 25, 2010

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Posted on Jan 02, 2017

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Thank you for contacting FixYa with your KTM inquiry.
This happens sometimes. Usually it's one of two things:
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Bikes bounce around quite a bit sometimes mounted on the trailer on the trip home and if the petcock is open this happens. Sometimes the float valve sticks open. Noting serious just smelly and annoying and gets you in trouble with the wife. Tap on the float bowl with the handle of a screwdriver and it usually will shut off.
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