I got a 69 F back about '82, had a main bearing turned on the gas engine (never had an engine at full power stop in 2 rotations before...) we put a salvage one in. Couple years ago that engine and whole combine got tired, so I bought the neighbor's F2 diesel. love it. Very easy to work on, I don't do engines, but I can repair the rest of the machine in the dark.Having engine problems with mine now, runs a bit when it's cool, but after a round or so in the corn it loses all power and sputters. Only have 10 rounds of corn left, but need to figure out the engine problem. See if the neighborhood mechanic can come over Monday. I was just curious if I killed it by not doing proper engine service.----Paul