Go out and run it til ti dies then the moment it dies Check to see if you have a good blue/white spark at the center wire and at the 4 plug wires that jumps a 1/4 inch gap or more. Stop guessing and throwing parts at it. Also try spitting on the coil. If the spit steams of of it pretty much the moment it hits the coil then good chance the coil is going bad. Or if you do not want to spit on it take a table spoon for water and throw on it and watch to see if ti turns to steam. Some people say to touch the coil but that can lead to a real good burn which is not a good thing
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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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