There is a float system in the carburetor that acts like a shut off when the carburetor has enough fuel in the float bowl. Fuel flows through the inlet through a needle and seat (float valve) to fill the bowl, when the needle and seat gets worn enough, fuel will seep past the needle even if there is plenty of fuel in the bowl. The fuel will leak into the air cleaner as well as the cylinder. Check the oil level on the bike as well, excess fuel will run into your crankcase.
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