As with any old bike, the debate is whether to go back to stock, or to modify. Well, this was a basket case when I got it, so I went the hotrod route. Its still a Sport, but its the best a Sport can be with parts of roughly the same vintage. I got an entire set of body work from a 900 Sport, as everything else was not good. I picked up the seat from another Sport, and had it recovered for $150. I took the tumblers for the helmet lock and seat latch apart and made them fit the key I had for the ignition. I just replace the plastic rear fender/tray piece.
The shock is aftermarket and was built for the Sport, but SS shocks work too.
GioCaMoto two into one headers with modified Supertrapp exhaust. Motor is basically stock, and I have never been into it. Still runs lovely.
I do have a 900 SS motor on the shelf that I may put in some day, if the old 750 motor ever dies.
I have had this bike for 7 years now, and could have just bought a good SS or 748 for the money spent, but there isn't one like it around. Still my favorite bike on the weekends.

Cheers, Phil