I checked the valve clearances last night and they were good if anything just a little on the loose side. I ran the engine on Sunday and it ran well just could not keep the intake tight and I had a flex muffler on and it broke so i made modifications to the plane to accept the stock muffler and it just would not run. I would choke it by holding my finger over the exhaust port and then on the next flip the fuel line would not have any fuel in it. Thanks for all you help guys, this one has got me baffled.