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 - The Rescue of a Fordson F - by Anthony West. Introduction I live in the UK and have for many years restored Fordson tractors (in the main model N's). I have also restored and shown model F's, E 27N's, Field Marshall Series 2, David Brown Cropmasters and the old rey Fergeson T 20. At one time I had seven restored examples which were shown and used in ploughing matches. As most restorers, I have a number of war stories I can relate on a range of topics that may help other like minded and interested people. Perhaps my first p
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