Worked on quite a few of these, back in the day, and found a lot of them had rings stuck and gunked up. No real wear, and assumed it was caused by start/stop operation, and never getting up to temp.
If compression checks low, I had good luck pulling nozzles, and soaking top end with BG44k, or GM Top Engine cleaner, to loosen up carbon, then blow out, reassemble, and get it started.
Cardboard over radiator and let it get hot...not meltdown hot, but up to about max safe temp, and let it run that way.
That would usually free things up enough to bring compression up.
Also, tap muffler with rubber mallet while running at hi idle....these will accumulate an unbelievable amount of soot and carbon!
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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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