Perhaps the one modification that I did right off was upping the countershaft sprocket one tooth. (besides yanking the AI). In stock form, the Boneville range is short legged and the addition of a slightly higher numerical ratio improves the driveability measurably. I know even my '02 790 has plenty of suds to pull an additional tooth, I never dropped back to stock when I installed the sidecar. As a progression, I have ported and bench flowed the head, installed custom cams, bored the CVK's changed the mains and pilots, shimmed the needles and built a custom exhaust, but at the outset, the bike was stock and became a tug with no complaint.
In as much as the late model bikes are FI with faux carburettor bodies replacing what I consider to be the best mixers ever made... Kehin CVK's, pulling the AI may be more involved.
I would also suggest a chain oiler like a Scott and/or Lubman. Though the chain is a sealed 'o' ring type. The chain oiler eliminates and chance of dry links and adds 'nostalgia'.