The lowest price component in this Carburetor Parts(canada)('79-'80 parts-list fiche is the Washer-spring,4mm.
A sample from the products for the Carburetor Parts(canada)('79-'80 include: Seat-spring, Cap,starter Plunger, Nut-hex,5mm, Jet-main,#a110.
With twenty-eight applications this Washer-spring,4mm is the most specified part.