undo the 6 allen bolts just enough so that you can slide the gas cap assembly around, and find the spot that it opens in the easiest. i want to say the gas cap has to little latches on the sides that move in and out... so centering the gas cap assembly should make it the easiest.
just do the 3 that hold it on. 12,4 and 8 o'clock
'04 Honda 919, Candy apple red met., 17/44t sprockets,f-16 windscreen,delkevic ss exhaust,Tharbars,givi engine bars, billet alum. led turns w/ running lights,red adj.levers from china, bar end mirrors,grip heaters,adj. foot peg brackets,adj. bar risers,dunlop Q2(that are better than your pp 2ct,lol)bike wired for gps and phone charger