I went to start my plane today and noticed it was very rough to turn. Last time it flew about a month ago there were no problems. I disassembled it to find out the pin on the crankshaft was hitting the backplate. It almost seems like the bearing in the connecting rod has moved out a little bit. Is there supposed to be a gasket on the backplate? Mine just has an o ring. If there was a gasket, there would be more clearance. Any ideas? This motor only has about a half gallon through it
Thanks