On this parts fiche the Bolt,allen,6x28 is the most specified component.
Parts such as the Generator/regulator ('80 A1): Regulator-voltage, Stator Assy,generater, Bolt,allen,6x28, Clamp,wiring Harness are included in the Kz440a2 Ltd 1981 Usa Canada Generator/regulator ('80 A1) parts fiche.
The Generator/regulator ('80 A1) is made up of components including this Flywheel,generator which is the most expensive.