This seems very clear as a dead battery. It's exactly the error one can expect. The bike won't start when the starter is draining the almost empty battery. It idled badly before it died, because it almost doesn't charge at all when idling, even with a healthy regulator. With a bad battery under a voltage, say 10V, the ignition system can't build up enough energy in the coil to deliver a spark. Machine dies.
I have had the same problem with a empty battery. My machine stopped when I turned on the headlight. No headlight took me back.
It's extremely easy to just check the battery voltage, or to charge the battery overnight. Just do it, and you'll be sure that's not it. A empty battery shows appr 9-10V, not 12-12.
If you don't want to buy a new Electrex rectifier unit, buy a used one from a junkyard. Any Suzuki will do, mine is from a 1999 bike. They won't break. Otherwise I guess a Honda or some other brands would work as well. There's no magic involved, just a 3-phase alternator and a 12V battery.
/ Henrik
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