Some Wisconsins use an odd fire magneto, meaning the cam lobes are not all equidistant from each other. If yours is one of those the mag has to be timed to the engine EXACTLY as specified in the manual for that engine.
Or, there COULD be a mis-match of engine and mag, an even fire mag on an odd-fire engine or an odd fire mag on an even fire engine. (This related to variations in the arrangement of the crankshaft throws over the long period of time the engines were in production, (and a camshaft to match).
Also, as to the alleged 3-1-2-4 firing order, convention is to start with #1, and in doing that your 3-1-2-4 firing order simply becomes 1-2-4-3, two ways of writing the SAME thing.
Also, IIRC, some Wisconsins used a mag without a half-time reduction on the rotor, meaning that the sparkplugs were fired twice per combustion event. LOTS of variations and possible chances for error.
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Today's Featured Article - Talk of the Town: The Saga of Grandpa's Tractor - by The following saga is from the Tractor Talk Discussion Forum. Someone. The saga starts with the following message: Hey guys I have a decision to make. I know what you all will probably suggest and it will probably agree with me way down inside, but here it is. I have a picture blown up and framed in my "tractor room" of a Farmall M. It was my Grandpa's tractor, of which whom I never got to meet. He froze to death getting this tractor out of the barn to pull a truck out of the ditch before I was born. Anyway my dad and aunt had to sell it at the auction,
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