Parts such as the Valve: Seat-spring,17.5x24.5, Collet, Valve-intake, O Ring,16mm are included in the En400a2 Vulcan 1986 Canada / Liquid Cooled Valve parts fiche.
The Valve is made up of components including this Arm-rocker which is the most expensive.
fifteen components are listed in the schematic for this En400a2 Vulcan 1986 Canada / Liquid Cooled Valve .