The most reasonably priced component used on the Yz250 1998 5dj2 France 285dj-100e1 Crankshaft, Piston is the Circlip (2f1).
In this schematic the "Circlip (2f1)" is used most often.
A sample from the products for the Crankshaft, Piston include: Oil Seal, Crankshaft, Pin, Piston, Crankshaft.