The component with the lowest price in the CYLINDER HEAD ('81 -'82 KZ750-E2 schematic is the Circlip,valve Guide.
Some items from this specific schematic: Pin-dowel, Clamp, Circlip,valve Guide, Head-assy-cylinder,bl.
The sub assemblies and components that make up this Cylinder Head ('81 -'82 Kz750-e2 include this Head-assy-cylinder,bl, the most expensive part.