On this parts fiche the Washer,17.3x22x0.5 is the most specified component.
The Bolt-upset is the lowest priced item on this Kickstarter Mechanism schematic.
Parts such as the Kickstarter Mechanism: Spring-kick Pedal, Gear,kickstarter,idle, Lever-assy-kick, Stopper are included in the Klf400-b1 Bayou4004x4 1993 Usa Canada Kickstarter Mechanism parts fiche.