On this parts fiche the Arm, Valve Rocker is the most specified component.
thirty-four components are listed in the schematic for this Xt250 Dual Purpose 1980 (a) Usa Camshaft - Chain .
Some items from this specific schematic: Nut, Brg,r-b 6005 47mm 80g Nt, O-ring (26h), Seal, Oil (30x).