Used my 1951 fleetline 66 gas burner a couple of weeks ago, tried to start it Wednesday and the motor is locked up removed the spark plugs and starter and can only move the flywheel a couple of notches prying on the starter ring with a big screwdriver. Anybody have any idea what has happened to it. It was running perfect with good oil pressure when I parked it and put a cover(can) on top of the muffler. Anybody have any ideas what happened?? I had thought about using acetone and atf injected in the spark plug holes but some think that it won?t help, another mentioned a dropped valve when I parked it. Anybody have anymore ideas, I?m desperate as my retirement machinery sale is Dec 8th.