rebuilt carburetor,//... You might have to re-adjust the FLOAT setting inside the FUEL BOWL, and the IDLE JET needs to be set properly.....YOU NEED A CARBURETOR REPAIR manual to do this,...or.... take the carb off the engine and take it to an experienced mechanic, then let him set the float adjustment, and check it out for you, after he has fixed the problem, re-install the carburetor and try it again.....And don't forget to pay him for helping you out.