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 - A Belt Pulley? Really Doing Something? - by Chris Pratt. Belt Pulleys! Most of us conjure up a picture of a massive thresher with a wide belt lazily arching to a tractor 35 feet away throwing a cloud of dust, straw and grain, and while nostalgic, not too practical a method of using our tractors. While this may have been the bread and butter of the belt work in the past (since this is what made the money on many farms), the smaller tasks may have been and still can be its real claim to fame. The thresher would bring in the harvest (and income) once a y
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