FINALLY found the problem! It was a bad connection. The 4 plug connector (ground, black/yellow wire to coil, & trigger wire), and the 2 plug connector (kill & stator wire) were not making good contact where it plugs into the CDI. This would explain why I was getting no voltage coming out of the CDI or at the coil and also why it would only run sometimes.
The connectors were wore out bad, so bad that I could wiggle the wires while someone tried to start it and it still wouldnt start! I would go to say 2 or 3 of them werent making contact. I stuffed some strands of 18 gauge wire in each connector end (as a quick test) and it fired right up. Drove it for a good while and everythings fine.
What a relief! I hope this helps someone who has similar problems. I always hate it when someone doesnt come back and post how they fixed the problem.
Man, I know this ignition system front and back now!
Thanks for the tip on scooter parts being interchangeable.
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