I'm sure someone else has had this problem. 2.4 Fox, starts, runs 20-30 seconds then quits. Ran fine till I moved it to another plane. About three years old. It's getting fuel, new filter, clean spark plug. New battery for ignition. No kinks in fuel line. Carb has not been re-built but like I said, ran fine till I moved it to a new plane. CH products ignition pack too. [ Champion spark plug in it ] Help ! What to do ? Thanks, MM