On this parts fiche the Collet is the most specified component.
Parts such as the Valve(s): Seat-spring, Shim,t=2.575, Spring-engine Valve,e, Shim,t=2.25 are included in the Klx450aff 2015 Europe Valve(s) parts fiche.
Of all the components that make up this Valve(s) the Seat-spring has the lowest price.