Of all the components used in this assembly the Output Shaft is the most expensive.
The most reasonably priced component used on the Kdx250-b2 Kdx250 1982 Usa California Canada Transmission ('81kdx250-b1) is the Washer,toothed,25.3x3.
Some items from this specific schematic: Gear,3rd, Sprocket-output,14t, Gear,low, Output Shaft.