if your splitting and cases for the tranny...if i was you i would
Change Forks
upgrade shaft
circlip mod?
ceramic coat gears or something along those lines.
check bearings
try to make it future proof and strong as possible without going overboard on a stockish bike
also while i was in there, ive personally been thinking about:
have APE balance the crank (you can remove the countershaft then and have a silky smooth bike) (although i wouldnt lighten it)
perhaps a HP oil gear
think about the Cam upgrade with another intake (i think)
i dont know alot about these engines, but i have been researching the best way to go incase the seemingly inevitable where to happen.
having the crank balanced silky smooth only costs about 120$ and might well be worth it. same with more fluting on the journals and the gear.