I have both a Nighthawk 750 (1992) and a Bandit 1200 (plus an old GSXR 1100, which has the same engine). The Nighthawk is basically NO maintenance (change oil/filter, clean air filter, lube chain), The Bandit is easy to maintain, especially if you remove the EPA mandated tubing etc. It does have an easy system for valve adjustment (locknut), no shims, as others have said.