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 - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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