I think it's the nature of the air-cooled Wisconsin engines. They don't cool quite well enough, get a little hot, and the exhaust valves stick from time to time.
There was an Owatonna self-propelled swather on my grandfather's farm with a 4-cylinder Wisconsin engine. Dad tells stories about that thing constantly having problems with stuck exhaust valves on that thing.
Seems the engine would get a little hot and hang up an exhaust valve. They had fixing it down to a science. IIRC, pop the valve cover, squirt a little oil in, tap-tap-tap, and back to work.
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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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