In this schematic the "Nut,8mm" is used most often.
Parts such as the Cylinder Head/cylinder: Circlip-type-e,4mm, Bolt-flanged-small, Valve-exhaust,lh, Gasket,reed Valve (nas) are included in the Kdx125-b2 Kdx125sr 1991 United Kingdom Fr Sd Cylinder Head/cylinder parts fiche.
The component with the lowest price in the CYLINDER HEAD/CYLINDER schematic is the Bolt-flanged.