12V coil can get you the 1/4 inch gap jump. That 6V coil will not jump that distance. You might get an 1/8 inch gap, (.125) if your lucky. Plug on your machine should be running the .025 gap and as the plug wears it can widen itself out to .028 and still be within spec.
Electricity is like most people. Minimal effort. That 40,000 Volt coil is NOT going to fire 40,000 volts each time. Only what is needed to jump that .025 gap. Chances are the 6V coil is down around 10,000 Volt or less.
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Today's Featured Article - Tractor Generators - by Chris Pratt. As a companion to the articles on three-brush and two-brush generators, it seemed fitting that we should provide our readers with a description of how a generator works in lay terms. The difficulty with all those "theory of operation" texts is that they border on principles of electricity or physics and such. Since I know nothing of either, you will have to put up with looking at the common sense side of how generators work which means we "
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