The lowest price component in this Cylinder - Crankcase parts-list fiche is the Washer, Plain (646).
Some items from this specific schematic: Gasket, Cylinder Head (nas), Brg,r-b 6302 42mm 82g Nk, Circlip 101116340000, Piston 2ndo/s.
Of all the components used in this assembly the Crank Cylinder Assy is the most expensive.