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2000 YZ250 leaking gas

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There seems to be fuel leaking from the bottom of the carb. I thought it was coming from the drain bolt on the float bowl, but I replaced the o-ring and it is still leaking. I can not figure out why it is leaking. Also when the bike is running it is spewing white fumes out of the tail pipe. Any ideas?

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Sounds like the needle valve is stuck or the floats are adjusted wrong. When this happened to my bike I pulled the float bowl. Took the floats off and examined the needle valve. There was a lot of gunk on it and it was stuck. Cleaned it up and havent had the problem again.

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