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 - Harvestin Hay: The Early Years (Part 2) - by Pat Browning. The summer of 1950 was the start of a new era in farming for our family. I was thirteen, and Kathy (my oldest sister) was seven. At this age, I believed tractor farming was the only way, hot stuff -- and given a chance I probably would have used the tractor, Dad's first, a 1936 Model "A" John Deere, to go bring in the cows! And I think Dad was ready for some automation too. And so it was that we acquired a good, used J. I. Case, wire tie hay baler. In addition to a person to drive th
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