It has been my experience that if gas pours out of the overflow when running that it sill continue to come out when the engine is shut off (fuel still on). In this case fuel is coming out of the over flow only when the bike is running. There is no excess fuel coming out of the carb (into the filter, just the overflow. I just rebuilt the carb. New jets and all to try to solve this problem, but it didn't go away. Any ideas? Thanks.