I may be completely out of my mind here, but if this was my bike, and I was looking at the wiring diagram (see Docs post), the feed for the coil has a wire running off of it to run the tachometer. If this wire was able to be unplugged, I would unplug it, as close to the coil/CDI as possible, to eliminate it (the wire itself and the tachometer) as a cause of trouble.
At the very least I would unplug the CDI and coil, putting an ohmeter between the wire and ground, and get a feeling if something was going on there.
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