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Lower float bowl leak (04 YZ 250F)

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I've got a 2004 YZ 250F. Last fall while on a trail ride, I encountered a serious problem (or at least I think so). While the bike was upright, and the engine was off (after riding for a while), fuel started leaking out of the lower float bowl. I turned of the fuel petcock... and it stopped (big surprise) but each time I opened it again, it started to leak again. Somebody told my to tap/hit it with the back of a screwdriver. After a couple of times, it stopped.

Unfortunately it has happened again a few other times. We took the bowl off and checked it. Unfortunately, there was nothing to be found. It was clean and there was no wear. We put it back on and it worked great. So, just before packing up to race last night, it happened again. I am without a clue and I would really appreciate some help. Have you had the problem before? How can I fix it? Is this going to cost $$$? :thumbsup:

Thanks for your input.

G.

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