If it is running on one cylinder it would just sound like a single cylinder lawn mower idling. Putt putt putt. Running rough means irregular firing making variable speed and little power. With it running, pull off one plug wire at a time (with insulated plug wire pliers). This allows diagnosis of which cylinders are working. If no change the cylinder is not working. If it dies, or slows down radically it is working. The #2 plug seems to have oil fouling on it. the others look about right for today's fuel, and a few hours of run time. The next step is to assure the point gap is correct, the timing is good, and the mixture is rich enough. If these are good, and the issue persists, check the compression. adjust the valves, and get back to us. Jim
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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