i just rebuilt a '72 honda cb350k4. re-assembled it this past weekend and when i attempted to start it...gas ran out of the overflow from one of the carbs. i did rebuild both carbs and i'm not sure if i assembled one of them incorrectly. any ideas on what would cause gas to just flow through the carb? it only pissed out when the starter was cranking? planning on pulling the carb and tearing it apart again. not really looking forward to it so figured i should check with teh experts first.