how low is the battery voltage? whats the amperage dropping to? put a multy on the battery and watch with the key off then on then with the starter button. if it is going below somewhere around 11.5 the fuel injection will not kick in becuase your useing the battery to turn the bike over and have no more juice left. also listen to see if your fuel pump is cycling on when you turn the key on with the kill switch in the run postion. injectors can stick also. if the stick take them out and hook them up to 12v and listen for a click. just touch it on and off rapidly to 12v.