The lowest price component in this Crankshaft / Piston - Chart parts-list fiche is the Bolt Hex 8x22.
Some items from this specific schematic: Bolt,hex.,8x22, Brg.d,conn.rod2.4, Ring Set,piston, Nut Conrod.
Of all the components used in this assembly the Crankshaft Comp. is the most expensive.