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 - Talk of the Town: Winterizin Engines - To Drain or Not to Drain? - by Staff. Another great discussion from the Tractor Talk Discussion Forum. The discussion started out with the following post: "Winter is fast approaching..for a gas tractor should the gas tank be drained and run the engine til the carb is dry or do the gas stabilizer products I've heard of work? (tractor will not be used til spring) any other tips for winterizing?? "
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