Of all the components used in this assembly the Valve-exhaust is the most expensive.
Parts such as the Valve(s): Spring-engine Valve,e, Shim,t=3.00, Shim,t=2.05, Shim,t=2.15 are included in the Ksf450-bef Kfx450r 2014 Usa Valve(s) parts fiche.
Check out any of the forty Valve(s) components enlisted.