How about the battery? Just because it can run lights it might not be up to the task of delivering the relatively high current needed for the motor. The battery is wired right to the starter. I've never delt with this issue on my KLR, but somewhere between the battery and the starter should be a relay. Does this operate? If so, and the battery is good you may have a bum starter motor. It is possible with these motors to have an open commutator bar (or associated wiring) which could prevent it from running if stopped in just the right (wrong) place. My money's on the battery though.
Kurt
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