The most reasonably priced component used on the Xj750r Seca 1982 (c) Usa Crankshaft-piston is the Circlip (1l9).
Parts such as the Crankshaft-piston: Piston (std), Plane Bearing, Crankshaft 3, Plane Bearing, Crankshaft 3, Plane Bearing, Crankshaft 3 are included in the Xj750r Seca 1982 (c) Usa Crankshaft-piston parts fiche.
In this schematic the "Circlip (1l9)" is used most often.