went for a ride this weekend and when i top off my tank and started the bike the fuel gauge said i was already down 1 bar. (03 rr) i shot off the bike and check the tank it was full. i was at 95 miles and the fuel gauge started flashing (reserve) got the gas station and i only put in 2.5 gallons. what do i do? i bought the bike used. so i dont have a worrenty how much does it cost to fix?