I think you may be using the word "compression" to mean something else.
When the tractor "loses compression" as you say, what, exactly, happens? How do you "get it back?"
The only reason a tractor would actually be "losing compression" is if one or more valves sticks open. In that case the tractor would sound different as you cranked the engine over, and may actually crank faster.
This might help us in giving you some more useful tips on nursing that old tractor along. Ideally the engine should probably be overhauled but it's probably not worth the expense based on the overall value of the tractor and how much you actually use it. It may be more cost effective to find another tractor when this one gets so bad it won't go anymore.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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