That engine uses what is called wasted spark or something like that ign system. You need to have both spark plug wires hooked to plugs or at least a reasonable gap you would expect them to jump or you have an open circuit thus no spark. Of course an open circuit may well put the finishing touches on a soon to fail coil. Off subject a little but one of the main reasons for coil failure on magneto engines like lawn mowers etc is to crank away on them with the spark plug wire unhooked. The built up voltage has to go some where so it jumps across internal windings in the coil. I have seen several coil failures over the years on that onan engine. If another coil is available you can compare ohm readings between the known good one and yours but I can't give you a known reading off the top of my head.
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Today's Featured Article - The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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