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 River Tractor - by Charlie English Jr.. This is a 4010 John Deere that was used to farm on the Diamond Island which is in the Ohio River about 15 miles southwest of Evansville, Indiana. About ten years ago, this tractor was parked close to the bank as the river was washing the bank of the island away.
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