The component with the lowest price in the CRANKCASE schematic is the Nut,flange,4mm.
The Crankcase is made up of components including this Crank Case Set which is the most expensive.
Parts such as the Crankcase: O-ring,11.8x2.4, Orifice,a #100, Orifice,b #100, O-ring,13.8x2.5 are included in the Cb1000ra 2011 (b) England / Abs Mph St Crankcase parts fiche.