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 - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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