Of all the components used in this assembly the Cylinder Comp. is the most expensive.
With four applications this O Ring,61.8x2.0 is the most specified part.
Parts such as the E-5 Cylinder: O Ring 5x2.4, Cylinder Comp., Gasket,cylinder (mca), Valve,oil Control are included in the Cb650 1980 (a) Canada E-5 Cylinder parts fiche.