working on a 77 5000 el tigre for a friend of mine. the crank will not turn over. its like its stuck, maybe bad or seized bearing. plugs are out and the top of the pistons look great. this thing sat for a couple yrs but they hadnt fogged the motor when they last put it away. the motor was running to at the time. he said the pto side cylinder would over heat though. what would cause free air cylinder to over heat?