There is no off position on the petcock valve to stop the gas from going to the carb if the bike is off.if the needle valve is not seated or floats need to be adjusted it will leak out the nipple on the bottom of the carb.if the bike runs fine it probably won't leak when it's running because the engine is using the gas.simply get a $3 on/off valve at auto zone and put it on the gas line in between the petcock and carb.shut the gas off when not in use.PROBLEM SOLVED!!!!