Carbuator leaks gas on motorcycle
Two possibilities; the float bowl gasket is leaking, or the carburetor is overflowing (gasoline is coming out of the overflow tube).
If coming from the float bowl gasket, simply remove the float bowl and replace the gasket.
If it is overflowing remove the float bowl, pull out the float hinge pin, remove float and float valve. Clean the valve and inspect the valve for excess wear (a noticeable groove worn into the tapered seat) and replace if needed. While you have the float out, shake it and listen for any gasoline that may have leaked inside it. If there's liquid inside the float, toss it and buy a new one (or else your carb will overflow with gasoline constantly). Before you put the float bowl back on be sure to clean it out with soapy water and an old tooth brush.
That should take care of any leaks or overflowing.
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