Hi Mike,
I’ve just fitted a tezet electronic ignition kit to my 1990 MZ251 ETZ, and with helpful advice from Bynzi and encouragement from others including the article by Rich Warne, I’m very pleased to say that it has transformed the bike from a non starter, not even a spark from the old set up, to an easy starter and now able to tweak the carburettor so that a sweet tick over has been achieved. No old coil, rectifier or old style regulator to worry about.
If I hadn’t gone down this route I think I would have been thinking of passing the bike on as a project for someone who likes points ignition and the complexities that accompany it! Very much recommend you go this route.