The failure mechanism there would be high amplitude interference spikes coming back down the line when the spark plug fires. The resistance wires have about 5k ohms or so which does a good job of attenuating the feed back. Sometimes a little inductor can be used with solid wires. The inductor resists the high frequencies of the spark but offer low resistance to the dc current once the plug is fired and for the duration of the dwell and can make the difference on plugs that need a lot of energy to fire properly.
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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