What type of riding do you do?
You could delete the oil cooler, remove all the unnecessary switches on the bars, get rid of the headlight and tail light and their respective wiring, get a parking brake block off and remove the OEM perch on the clutch side of the bars and get an ASV or something like that to shave weight. Get rid of the airbox and get a sock for your air filter.. take off the front bumper since it's pointless anyway... get lighter wheels and brake rotors, lighter piston... im about all out of ideas.
In the end if your a trail rider all of this will be almost pointless.
If your drag racing then race cut the harness, get rid of the front brakes and get drag wheels too.