F20 can use straight unleaded gas- old manuals suggest 1 cup of engine oil to 5 gallons of gasoline. The engine doesn't run fast enough- cam duration isn't open enough to cause exhaust valve seat erosion problems. IHC Super H,Ms may have some erosion if run steadily at 1800 RPM, Cases and AC late 50s noted to also be susceptable- this from a Wallaces Farmer articles early 80s when unleaded became standard- 1500 RPM seemed to be the start of extra erosion. Ford Ns were not at risk as Ford had used stellite seats to start and JD twins didn't run too fast and valve timing didn't have long duration. F20 governed 1000/1200 RPM- just add a bit of oil to gas like old manuals suggested. RN
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Today's Featured Article - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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