Sounds like the wrong piston is in the cylinder. It shouldn’t do that. If you bolt the head down and pull the cord slowly when the piston try’s to come to (TDC) top dead center the piston will hit the head. That’s not good. Again, it sounds like the wrong piston. I can’t tell you which way the IN goes. Is there a dome on the piston? If so, look at the head to see if the dome is on the wrong side of the head. That’s possible.