Disassemble the carb, but lay out the pieces in order so you don't 4get how to put it back together, use a blow gun, clean all that is possible, put back together and if it still don't work, your bulb may be old and not as flexable as when new. I have many weedeater motors, and had the same problem. Just clean clean clean and replace bulb if needed, and also make sure your fuel filter in the tank isn't clogged. Hope this helps