of course I spoke too soon... the kill switch (not the one for the coil, but the one that comes from the key to the 'rotor' had come off. and now having fun and games with different coils (of three I have) and different spark plugs. so it is a spark issue.
and to make matters more complicated, the coils , esp. the cheap ones from the land where they are made, can go bad simply by having the plug gap wrong, or perhaps a pinched spark lead, or perhaps leaving the kill switch lead off it. this channel had one on all that... ruling out all possibilities, which is what I have to do around here. https://www.youtube.com/@TheRepairSpecialist
and
and a new spark plug which is the same as the old one RJ19LM , cause one of the new ones had no spark.
and try joining a spark lead to one of the new coils which had the lead too short (my mistake on purchase).
I actually got the motor to run with an old coil which had the lead end off , bare wire, and an alligator clipped wire to join to the spark plug.