On this parts fiche the Cotter,valve is the most specified component.
Parts such as the Camshaft/valve: Shim,tappet (2.47, Shim,tappet (2.67, Shim,tappet (2.05, Shim,tappet (1.67 are included in the Cb1300 2008 (8) Australia / Two Camshaft/valve parts fiche.
The most reasonably priced component used on the Cb1300 2008 (8) Australia / Two Camshaft/valve is the Seat,valve Spg.