I had a 1975 Triumph Trident. Great bike. But the Lucas electronics were unbelievably bad. They still don't know how to make a starter.
Same here with a Sunbeam Tiger 2 that I owned. When I bought it used for $300.00 it would run but nothing else worked. I remember driving it home in the rain and rubbing tobacco from a cigarette on the windshield so I could see. Once I got it running I loved it. Except when it overheated in warm weather.
I had a Matchless G-80 (a 500cc single cylinder thumper) many, many years ago. It was stripped down for desert riding. The ENTIRE electrical system was the magneto, an 18” length of wire, and a spark plug. It still had problems — and not in the magneto, either.
The wire was some kind of carbon paste with plastic/rubber over it. Turns out that it had 4 breaks in it because of age, drying, and shrinkage. Replacing it with a copper wire made all the difference in the world. Of course, anyone in a car with the radio on within 100 feet would hear nothing by static. Not that I cared since it started so much easier.