Use a drill bit to drill the head of the bolt off. 1/4" ought to do it. The head will pop off once you drill thru it, then you can remove the tank and use a pair of pliers to ease the remaining bolt from the threads.
2002 Sprint St, RaceTech Springs and GVE, Reworked Shock, Raised Rearsets!
Zero Gravity DB Windscreen, CF Tankpad, 18T Front Sprocket, Fuel Pressure Regulator Mod
Quick Turn Throttle Mod, Michelin PR3, CF TOR, Corbin Seat, Luggage Rack