Cameron, insulation technology wasn't what it is today back in the magneto era.
Resistance wires make the voltage at the mag reach much greater peaks than with solid wires, potentially leading to an early demise of the coil inside the mag.
Some old mags even had internal spark gaps set a little wider than the sparkplug gap so the spark could jump harmlessly to ground if, for instance, a plug wire fell off, rather than seeking a destructive path to ground through the insulation in the coil or the distributor cap.
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Today's Featured Article - Ford Super Dexta - by Anthony West. The rusty blue tractor caught my eye as my truck zipped by the farm implement business. It looked so fornlorn amongst the lineup of newer equipment. But it was just the right size for my small farm. I stopped in and asked the proprietor for further information. "It's a 64 Ford Super Dexta", he said. "It's a tough little tractor, although it's a hard starter being a diesel and all." He did manage to get it running, compliments of a can of ether. Once started it putted along pretty good. It
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