2000 YZ250 leaking gas

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?

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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