The most likely cause is dirt or some other foreign matter caught on the float valve seat. Other possibilites are a worn float valve, or the float level is set too high.
First, I would turn off the petcock and loosen the drain screw on the bottom of the float bowl. Allow all of the fuel to drain out, then retighten the drain screw (but do not over tighten it) and turn the petcock on. This may solve the problem by allowing the whatever was stuck on the float valve to drain out with the gasoline.
If it still leaks fuel, your next step would be to remove the carburetor, take off the float bowl and remove the float valve. Clean everything thoroughly and inspect the tapered seat on the valve. It is normal to see a faint ring of wear around the tapered seat. Anything deep enough to feel with your fingernail means that the valve needs to be replaced.
With the float valve cleaned - or replaced if worn, you should have no more leakage. It is also a good idea to clean out the fuel strainer that is built into the petcock. Keeping any particles of dirt from reaching the float valve will ensure that the leakage doesn't happen again.
Your problem is your floats are stuck in the carb. to solve your problem take out your carb and unscrew it flicker the floats then screw it back together and put it back in. this ssue can be caused by running your bike till its empty.
It Could Be Cause Your Float Is Sitckin From Dirt Or Somethin Like That.. I Have An RM85 And It Did The Same Thing So i Cleaned The Carb And It Never Did It Again.. So Give It A Try And See If It Helps.
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