Ok heres the deal i have 02 gsxr750 19k miles, bike will start an run mint for few min the will get a bad bog at like 3 to 5k rpms, tryed new fuel pump, ecu ,coils,plugs, rectafier, sometimes when u start it it will run good for few mins then start doing it, again then sometimes kick back forth, when u tack it like 6k plus it will run fine, its only a low end bog, can someone please help me, thanks you

 

bad injector???

 

please someone, fuel injectors??

 

id be willing to bet the secondaries are sticking closed (at least a bit) pull the tank and airbox, turn the key on-see if the electric secondaries open and close. Then, try removing them completely (whether they open or not) and give it a shot. These bikes are PRONE to that solenoid failing.