Bike is a 79 T140 with Mk 2 Amals. I changed out the carb to head rubber couplers and have the air filter covers off. I turned the gas on to check the fuel line to carb connection for leaking and after several minutes gas started coming out of the throat of the carb. Is this a problem. I always turn the gas off when I turn the bike off after riding so I do not know if it normally happens with my bike. Should the float closing the rubber tipped needle overcome the gravity pressure? Thanks