You can tour on any bike you fancy. As long as you understand it's limitations, anywhere's possible. My best mate Norman rode a Kawasaki Z200 (single cylinder) from Belfast, down through Scotland and England and on to the south of France. And he was two-up with his girlfriend too.
I've gone touring on everything from a TDR250 Yam, GS1000 Suzuki and everything else I've owned up to the VFR. The only thing I would say is with a un-faired bike, you get a bit tired quicker if the speed is high.
Changes ? I usually find out what I'd like to change when I've got home.