It may be just me but what is the valve clearance in the engine. When cold the valves might have enough clearance to work pretty well. Then as the engine is warming up the valves grow and the clearance disappears holding the valves open slightly. This will give the engine a doggy symptom. Without having a dead spark issue like a coil getting hot I would think it would be mechanical with the valves. It isn"t a big deal to lift the hood and valve cover to check this. Maybe since the engine rebuild the valves are seating in a little farther then when the engine was first done. Just a thought.
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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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