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Well I was right. the mower ran for about 10-12 minutes than died. Immediately I pulled the plug and checked for spark and there was none. Replaced the coil with the one from my donor and it fired right up and I was able to complete the job which took at least another 30 minutes. Looks like this...

OK, so I'm thinking this must be heat related and it is the coil. I inspected the wiring and none of it is frayed, chewed or otherwise damaged. Then, as Fish suggested, I disconnected the kill wire and checked for spark. I had spark! Re-connected the kill wire and checked for spark. I had spark...

Thank you for this. I never had to remove the flywheel. I hadn't considered leaving that ground wire off of the coil and trying it. I did check out the switch with a meter, and it appeared fine. Should be able to move the coil over from my donor machine easily enough.

So I have managed to keep this little Yard Bug running for nearly 20 years because I have another one that I have used as a parts donor. But I've come across a problem I can't figure out. I have no spark. It will crank like champ, but there is no spark at the plug. Removed and tested the magneto...