With two applications this Bolt,knock,7x12 is the most specified part.
Parts such as the Cam Chain/tensioner: Spg,tensioner, Tube,tension Spg, Chain Cam, Pin,lock 6mm are included in the Cb250 Two Fifty 1992 (n) England / Mph Cam Chain/tensioner parts fiche.
Of all the components used in this assembly the Tensioner,chain is the most expensive.