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 - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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