carb leak

Aug 22, 2010
111
0
42
ROC ny
ok so ive cleaned my carb like 5 times. checked float height etc. etc. put carb back together. I turn the gas on, let the carb fill up, no leaks from the overflow......start the bike hit the gas so the carb will fill again, leaks gas out of the overflow. so its gotta be the needle is getting hung up in the seat right?. I'm going to try the "toothpaste trick" but if that doesn't work, whats next replacing the seat?