Did you mention in your original post that you had a power commander on the bike? If so, which model? Try disconnecting the PC (put it back to stock) and see what happens. I had a PC3R on my last RC that went south, and the fuel pump would not prime and the bike would not turn over. Removed the PC and everything worked fine.
If that is not the case, or you don't have a power commander, I would check the tip over sensor.
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