I had a bad coil cause a 140 to sputter and stop after it warmed up. Choking wouldn't help though. Similar problems on my 140's always turned out to be something in the ignition sys breaking down. I would start at the coil (does it run OK when 1st started?). Then points, cond, grounding connection on inside of distributor, and don't forget wires and plugs (wire brush them). See any sparks around ign sys at night? I also had a sputter problem when a plug wasn't seating all the way in.
Choking would help if problem is in fuel sys. Make sure screens/strainers are clean and steady flow comes out at carb. Remove the oil bath cannister at the bottom of air intake while running and see if it improves.
Could also be a valve sticking. Many possibilities.
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Today's Featured Article - Uncle Cecil's Super A Lives Again - by Mike Purcell. A week or so out of most of my childhood summers was often spent with my Uncle Cecil and Aunt Sissie in the small East Texas town of Maydelle on their 80 acre farm. Some of my fondest memories of these visits are those of learning to drive a tractor at the helm of Uncle Cecil’s 1948 Farmall Super A. Uncle Cecil was the second owner of this wonderful little tractor, but it was almost as though he had adopted an infant. The original owner was a man from Minnesota who bought her from a local dea
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