How hard is it to find parts for a1982 CB750C?

I'm buying my first motorcycle and my one must is they must have a kick start. I got my eyes on a 1982 CB750C with an alleged 7500 miles for $2000 (I'll try talking them down obviously). I'm mechanically capable and wouldn't mind doing the work myself. My concerns are reliability and how hard finding especially rubber components for a 40 year old motorcycle.