I too go for the heat shield solution. Root problem is probably the copper. It has a pretty good temperature coefficient meaning it changes resistance readily with temperature. That's why, when you see things like a power distribution standard where they talk about a 2% drop for a ......sized wire at a ....... current, the temperature is specified.
Copper gets hot, too much resistance in the circuit, limits the current to the plugs and as a results not enough energy to jump the gap and stay lit long enough to explode the fuel.
Many many times I have seen people with similar time related problems and find it's to the coil getting too hot.
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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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