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I had a bike that died because the resistor in the right angle cap that hooks to the spark plug opened up. That was a single, but don't neglect checking the high tension wires and connections.

I think that most electrical problems on bikes can be traced to bad grounds. Suggest you manually make the needed ground connection(s) to the ignition system, bypassing the ignition switch. You can also manually trigger the coil if the bike has points, and probably also with other ignition systems, although I would disconnect electronic ignition if I was going to play these kinds of games.

So, we added to your list:
coil ground
ignition switch
points or electronic ignition system

And although unlikely, it could be a mechanical failure. I once had an Econoline van lose spark because the distributor shaft broke in two.
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