A sample from the products for the Crankshaft & Piston include: Bearing(1lx), Pin, Piston, Rod, Connecting, Oil Seal(87a).
On this parts fiche the Washer(8ax) is the most specified component.
nineteen components are listed in the schematic for this Yz125 2019 B0v2 Europe 1ub0v-300e1 Crankshaft & Piston .