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 - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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