Thanks for the ideas, I'm going to check into several of them this weekend. my best guess is an ignition problem, but I'll check the compression.
for the coil since the tractor is positive ground should the + go to the distributor?
About the valves, before the engine was started I inspected them through the spark plug holes and what I could see of the seating surfaces was very good. Later I followed the instructions in the book and adjusted the valves with the engine running. I am very confident that at lower speeds the valves are not sicking. The book implies that valves that work at idle can still stick at higher speeds and or under heavy loads, which is when the this engine gives problems. Has anyone ever experienced this, and how can it be diagnosed?
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