mainly electrical issues. i know some guys will only look for 97 and above but i have worked on several 95s with no problem... mainly the XL 1200c and s
but they also have better brakes with the floating disk up front... pretty much since the ironhead conversion to evo all sporty motors are the same since 86 to now with the exception of fuel injection and pushrod upgrades, motor mount locations, altenator upgrades,and oil pump feed lines.
but from 95 and up the gas tanks went to a 3.25, relocation of the ignition, and upgraded the petcock... the year before in 94 there were several upgrades the whole oil feed system as well as a completely new wire hareness that did not seemed to get the bugs worked out and work great untill 95.
but my personal opinion anything above a 95 is great... they changed the gearing and ignition system around in late 95 early 96 made for a much smoother and better ride...