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From what I have researched in the past from other postings, if your tach needle is jumping around, that is a sign that the CDI is failing. They are heat sensitive, and once a faulty one get heated up from the engine, it will fail altogether. Notice how the bike started up when the engine had cooled down. I built a heat shield using foil insulated bubblewrap, that is used to insulate ductwork. So far no problems, but then again maybe my CDI is OK to start with. I took the protective measure anyway. If you can borrow a friend's CDI from a SM, or TBA, and try switch it with yours, then see how your bike runs.
Your best bet is to talk to a Triumph service manager, and ask him what would be the symptoms of a CDI failure. Try calling a few dealerships around the country, so you get a consensus of their answers.
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