The front disk are already a pair of super light Honda CBR600F41 which have the same bolt pattern, but used 6mm bolts. Calipers are SV650, bars are big 1.125" alloy fat bars. Headlamp shell is long gone, gauges replaced with trail-tech vapor, alloy rims, fiberglass seat, small battery, removed battery tray, wiring panel etc.
Footpegs have been substantially lightened and so has the gearshift lever. Footpeg bolts and axles will be gun drilled, but there's no rush. I should replace the wheel bearing spacers and other wheel spacers with aluminum items too at some time. Shock nuts are aluminum, light rear shocks etc.
Gear shift levers before and after
Left peg before
and almost done
I also removed the pair of lower radiator mounts and substantially lightened the cast iron motor mounts while I was at it.
Steel fenders are also in the recycle pile, but I did add a fork brace from Fast from The Past.
Starter is in the bin along with the associated, button, wiring and solenoid, and clutch.
I have looked at the alternator rotor and gearshaft, but they are not going to be easy to slim down. I got a few grams off the kickstarter gear drive but I need a aluminum kick start lever.
Got one today that i think could be made to work
Points cover is 3 inches less wide, the starter gear is severely lightened, points shaft is gone and will be replaced with a 25mm long sleeve nut to take the electronic ignition rotor. And of course the exhaust is a Strader 3 into 1 which weighs nothing.
If I have a few titanium bolts in one of the sets of race kit spares I may fit some just for fun, but that is a very expensive route to lightness. I rarely use them on race bikes, but i usually have bolts and axles drilled out and non-critical bolts are replaced with Aluminum. I do use Titanium sparingly in things like brake bolts.
Target weight 400 pounds ( I just pulled that out of thin air. It will weigh whatever it ends up weighing).
My other GT has the YZR tank, R7 carbon/kevlar seat, GSXR ssupension etc. This one is just to use up surplus parts and is almost stock by comparison to that one.