Dynaflow Buell
I forsee a Buell with a Dynaflow, Flight Pitch to be exact. Infinte variable pitch gearing to keep that old lump of a motor in the "sweet spot".
Watch out for sticking it in reverse when you slam it into low gear btw. Maybe next Buell can go to a "nail head" design, in keeping with it's penchant for the latest motor tech.