6'3" on a KTM
Well, I guess you have to access where your inches are coming from. I'm 6'3", but have a shorter inseam (32), so usually, stock set ups (seat to pegs) don't bother me. I'm only a 12 shoe, but find stock pegs a little small, so that may be enough reason to change 'em out.
Up top, I always lean the bars forward and stack 2" worth of risers (pitposse on ebay = cheap) to keep more comfortable (upright).
BTW, if your bars are cut down, they will be quicker, but having your hands closer together can effect breathing. I like 'em as wide as possible.