What size and brand carb do you have? Sorry if you already stated in an earlier post. Several things will cause your problem. There should be a screw opposite the nipple at bottom of the bowl. That screw when loosened will drain the fuel bowl through that nipple or the fuel gets so high it tops the overflow stand pipe in the bowl. Make sure the screw is tight and dirt is not present in the screws seat, this will cause a leak. Some drain screws use an O-ring, make sure it is good. Next make sure the needle/seat, seats and does not leak. Last the reason I ask make and size of carb is I recently replaced a stock Mikuni 26mm carb. on a Kawsaki 250 with a Mikuni VM-26. It kept flooding on me after changing jets, jet needle, needle jet, and adjusting the float. It turned out the needle seat was too big for my application. Once I down sized the needle and seat I had to go up on the main and pilot jet.
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