The most reasonably priced component used on the Yfm80n 1985 Moto-4 Electrical 1 is the Washer(6a1).
Some items from this specific schematic: Fuse (10a), Band, Battery, Cdi Unit Assy, Washer(6a1).
The Electrical 1 is made up of components including this Cdi Unit Assy which is the most expensive.