The Screw, Flat Head(4em) is the cheapest item from this partsfiche.
Parts such as the Crankcase: Oil Seal(50m), O-ring (5g2), Cover, Chain Case, Adaptor are included in the Yfa1h 1996 Crankcase parts fiche.
The Crankcase assembly is constructed from several parts from which the Crankcase Assy is the most expensive.