In this schematic the "Cotter Valve" is used most often.
Parts such as the Cam Shaft / Valve: Camshaft,intake, Seat,valve Spring Exh Inner, Plate,valve Seat, Bolt(7x11) are included in the Gsf1200 1998 (w) (e02 E04 E18 E22 E25 E34) / P37 Cam Shaft / Valve parts fiche.