Hm... strange... that Japanese Parts Lists shows all kinds of stuff that I relate to the first model CB500... but the page with the camshaft depicts only the 4 SHAFT, ROCKER ARM 14451-323-000 where as even the 1976 compiled parts list of my model depicts both the 8 SHAFT, VALVE ROCKER ARM 14451-323-010 up to enginenumber 2170314 as well as the 4 SHAFT, ROCKER ARM 14451-323-020 from enginenumber 2170315 on. Ah, now I see... the early model didn't have those 4 PIN, ROCKER ARM SHAFT COTTER.