Hello Mart,
First -excuse me redundancy- check electric conexións, clean fuse box -change fuses if necesary- and battery.
I bought same VAPE electronic ignition time ago for rapid change when my original ESE 8389.30 malfunction.
The VAPE electronic ignition continues in my spare box.
Aprox. 500.000 kms and the original Hall sensor and black box works very good.
You must think that I am a lucky man but never win the Lotto
.
I never listened or read VAPE electronic ignition problems -if parts are mount correct- -no "gremlins"- in MZ.
The best -and expensive- is a VAPE complet generator/electronic ignition. The complet system in MZs run ok but
my friend Iñaki tell me bought a complet VAPE model for his Bultaco -basically VAPE is the same model for a lot of motorcycles- and don´t run well because is much more light than the original.
Best Regards,
Manuel