The Ce50es 1986 Riva Jog Crankshaft - Piston consists of twenty-one pieces with the Crankshaft Assy being the most expensive.
With two applications this Bearing(1gj) is the most specified part.
Some items from this specific schematic: Brg,needle, Nut, Hexagon, Circlip 101116340000, Crank 1.