We're talking antiquity here, but anyone fiddled with later CDI units,
from any KX Kawa, to replace the garbarge on a '73 F5 Kawa 350 enduro.
I mean, they all have three leads in, three leads out and earth. Am past
caring for rev subtles, simply anything that starts the motor, and hopefully
advances the spark.
Or a simple points/coil/magneto arrangement, as on the same series F8 250