Can anyone explain why my carbs leak. Here is what happens. The bike has sat all week long with the fuel shut off at the tap . I turn the fuel on , start the engine and after a few minutes it starts leaking. I shut off the engine and fuel, take the bowl cover loose drop the bowl slightly spilling some fuel and put it back on :-[and open the tap start the engine and its fine. Is the float sticking open and overfilling or what?