My QT-50 won't run. Its getting plenty of spark(new pick-up and ignition module) and if I spray a few drops of gas in the spark plug hole it will run a few seconds and then die. Its getting gas to the carburator so I'm assuming its a carb or reed valve problem. Does anyone know of any common problems of these 2 parts or what is the most likely suspect?Warped valve, stuck float, clogged jet?