Ganno

Hi I have xs250 my trouble is I can not get above 80kmph and will not pull top gear when I do it just losers rpm and road speed ,I have replaced plugs and leads,has a whole new wiring loom,cleaned carby ,has a new needle and set and floot,new air filters ,the bike runs well always starts first kick,seems to be running great at lower end but just dies in top gears