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 - Talk of the Town: Best Tractor? - by Staff. This recent discussion on the Tractor Talk discussion board here at the on-line magazine drew quite a bit of response. We see the question of "Which tractor is best for me?" asked quite often. We thought you might find the responses interesting. As always, the names of the people participating in the discussion have been left out - we did not request their permission to reprint their names in this article. However you can find this discussion in it's entirety in the Tractor Talk archives.
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