The Valve is made up of components including this Arm, Valve Rocker which is the most expensive.
Parts such as the Valve: Shaft, Rocker, O-ring, Nut Hexagon 371121580000, Retainer, Valve Spring are included in the Ybr250 2007 5d11 Turkey 1f5d1-300e1 Valve parts fiche.
On this parts fiche the Cotter, Valve is the most specified component.