SOURCE: The coupling between magneto and engine broke, and
1) Check the points (inside the magnetor cover) and clean if needed.
2) It could be 180' out of time.
As you rotate the engine and come up to compression TDC, the magneto should trip or 'click' to start the spark. If that click is on the exhaust stroke, it is out of time.
*Magentos will make a very sharp bright blue spark, so points, condensor, and coil is very important.
I’m happy to assist further over the phone at https://www.6ya.com/expert/rolandw_c013176d62ee17ae
SOURCE: seeking a good place to find info on 4 cylinder wisconsin gas engines
You might try your local Ditch Witch dealer. The older trenchers used an air cooled 4 cylinder Wisconsin engine.
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