Just go through the list of usual suspects... Spark, fuel, compression.
First, just to say you did it, put in a new plug. They can do strange things, lead you down the trail of "Wish I'd done that $100 ago!"
Check out the fuel system. Clean fuel, no water, clean filter, vented cap, fuel getting to the carb, fuel line well away from exhaust, carb bowl clean, float level correct, float free to move.
How does the spark look? Break the electrode off the old plug and use it as a tester. The spark should be able to jump from the center to the base, base grounded, when pulling the starter. Be ready to quickly test the spark as soon as the problem happens. Could be the coil heating up and failing. Also disconnect the kill wire, just for test purposes, it could be intermittently shorting to ground.
When the engine quits, pull the starter slowly feeling for compression. Rare, but could have a sticking valve.
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Today's Featured Article - Good As New - by Bill Goodwin. In the summer of 1995, my father, Russ Goodwin, and I acquired the 1945 Farmall B that my grandfather used as an overseer on a farm in Waynesboro, Georgia. After my grandfather’s death in 1955, J.P. Rollins, son of the landowner, used the tractor. In the winter 1985, while in his possession the engine block cracked and was unrepairable. He had told my father
... [Read Article]
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