The Cam Shaft/valve is made up of components including this Camshaft which is the most expensive.
twenty-seven components are shown in this Gz250 Marauder 2004 (k4) Usa (e03) Cam Shaft/valve exploded diagram.
Some items from this specific schematic: Arm,valve Rocker Intake, Seal,oil(5.5x11x8.2), Bolt(6x12.5), Shaft,vlv Rocker Arm Exh(l:76).