169dodge

hi people can some one help my fzr 1000 exup ru has a fault whare itl rev to just over 4000rpm then start cutting out.the bikes had a new ecu,crank pick up,plugs,coils,battery have even investegated the chargeing system and everything checks out ok, we found that if you turn the kill switch on and off the bike behaves for a while so i tried bypassing the kill switch and no change and the fuel pump is ok....ANY IDEAS????????????????