The Yamaha GENERATOR has five products enlisted in the schematic.
On this parts fiche the Screw, Pan Head(3tj) is the most specified component.
Parts such as the Generator: Nut, Hexagon (1w1), Screw, Pan Head(3tj), Rotor Assy, Washer(6ta) are included in the Cw50rs 1996 4wl1 Spain 264wl-352s1 Generator parts fiche.