The most reasonably priced component used on the Kl250a2 Klr250 1979 Canada Cylinder Head/cylinder ('80-'81 is the Bolt,flanged,6x25.
On this parts fiche the Bolt,flanged,6x25 is the most specified component.
The Cylinder Head/cylinder ('80-'81 assembly is constructed from several parts from which the Head Assy,cyl,f.black is the most expensive.