The FM in question came back and seemed very good. It started the bike on the first kick. Over the course of the next couple of weeks, it worked nominally, but then degraded quickly to the non- startable mode. On the bench, it does produce a spark driven by a drill, but not by hand. Can the magnetic charge go away that quickly, and if so, what’s the cause? The coil could also be questionable.
A rotor and coil costs almost half of what a new Morris M does, so it doesn’t seem to make a lot of sense to re-rebuild the FM.
Maybe stripping the parts out of the FM and making a desk lamp out of it would be a good afternoon project.