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99 RM80 leaking gas

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My RM80 starts leaking gas out of the black run-off tube that comes out of the bottom of the carb when I turn the gas on. Took the bowl off to make sure the float wasn't stuck, and the float was good. What else could it be? It does it while the bike is running and when it is off.:thumbsup:

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There's a needle valve in the float bowl that controls the gas coming into the carb. When the bowl fills with gas the float moves up to close the valve. Sometimes a speck of dirt will deposit on the seat, keeping the valve from fully closing. It's also possible that either the valve and/or seat are worn.

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