SUZUKI DR 750

Hi techno wizzes, I have a DR 750 with about 70 000 k on her, motor is starting to get a bit tired , a little smoke & oil usage, there is small amount of black residue left on the rear fender after a ride, also my clutch is dying probably dead after today. I want to do the top end & also piston & rings, checking in the w/s manual I see the stroke is the same for the 750/800 only the bore differs,  I was thinking going up to the bigger bore. Any ideas on parts such as clutch plates, piston, top end bits, gaskets etc.
thanks