If you want to get serious about shaving weight, don't replace any stock plastic parts with billet parts. This includes water pump cover, clutch cover insert, rear brake reservoir, and stator cover. Ditch all the swiss cheese wheel guards. Aluminum foot pegs are about 2 lbs lighter than stock. Some other aluminum parts may or may not be lighter. Shifter, kicker, rear brake pedal, handlebars. I personally, would like to see some carbon fiber handlebars and steering stem. It would be cool to see a thread with accurate comparrisons between stock and aluminum parts. Cut unused brackets off the frame. Some people do some serious cutting on the frame.