The most expensive part in this assembly is the Cylinder,electro-fuse.
Some items from this specific schematic: Spring,muffler Connec, Damper,cylinder Head, Gasket,reed Valve (mca), Valve-assy-reed.
The most reasonably priced component used on the Kdx175-a2 Kdx175 1981 Usa Canada Cylinder Head/cylinder/reed Valv is the Nut,8mm.