Of all the components used in this assembly the Crankshaft-comp is the most expensive.
Some items from this specific schematic: Crankshaft,l.h, Shim,t=1.0, Pin-piston, Ring-set-piston,std.
With a quantity of two pieces, the Circlip-piston Pin is the most used part in the CRANKSHAFT/PISTON/ROTARY VALVE ( diagram.