A swith can fail is one of several different ways. The starter portion may work while the kill switch portion may have failed.Thanks. I only did the CDI readings because I thought I might as well, wasn't sure about it anyway. The main point was the other readings, all those coils.
I had a guy rebuild the carbs for me a few years ago, he's been a Yamaha approved repair agent for 30+ years so he knows his stuff. I assumed it could be faulty engine stop switch or key switch. I have confirmed 100% it's not the engine stop switch. I mentioned that I wondered if a faulty key switch could be to blame but he said no, if the engine cranks (which it does) then that switch shouldn't be causing no spark. I wonder if he's wrong about that? I hope not, he seems to know his stuff.
He said I would need to take it to him for proper diagnosis, but he's a long way from me and booked up for weeks/months
I was hoping someone might be able to confirm some of my coil readings were good or bad, and lead me in some direction towards something to try replacing!
If the kill switch circuit (white wire) has chafed to ground anywhere along its path from the kill switch/key switch to the CDI, the CDI will think that the kill switch circuit has been activated. Disconnect the white wire to the CDI. See what happens.