Like said below, the electric start has nothing to do with the ignition system. Unhook the wiring harness so that you illimiate all of the switches and wiring from the equasion. You will have a lighting and primary ingnition coil on the stator plate under the flywheel as well as the trigger coil. A shop manual for the sled will give the resistance tolerances for the ignition and triggers coils. If they are good you have the CD box and the coil the spark plug wires are attached to on the outside of the engine somewhere. The item that usually fails first on those old yammers (sleds and bikes) is the coil the spark plugs wires come out of and they are fairly cheap. Unless technology has changed, the CD box is the only component you can't test for failure. Nippondenso CD boxs rarely failed, but it did happen occansionally.
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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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