My 1950 farmall C has a zenith carb with only one fuel adjustment screw on the carb.
The adjustment is backwards from what you would think. Turn the screw in, clockwise, you make the fuel mix richer. I have my fuel adjustment screw turned max CCW. Look at your plugs. If plugs are black you are too rich. Start with battery voltage when running. IF someone converted to 12v, it is possible the coil isn't getting enough voltage.
Do a compression test. New plugs, plug wires, dist cap and rotor.
My farmall has a magneto. When I have an erratic misfire I have condensation inside the mag. The misfire happens after the mag gets warm and the condensation forms on the top of the mag cap. I use compressed air and dry out the mag.
Condensation under the distributor cab is a pain in the butt. Condensation caused an exhaust valve to stick on my Jubilee.
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Today's Featured Article - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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