The Crankshaft/piston assembly is constructed from several parts from which the Crankshaft,comp is the most expensive.
Some items from this specific schematic: Ring Set,piston O, B/brg Rad N/com, Key,woodruff,4mm., Ring Set,piston O.
eighteen components are shown in this Crf50f 2011 (a) Australia Crankshaft/piston exploded diagram.