The component with the lowest price in the CRANK BALANCER schematic is the Key 4mm.
Of all the components used in this assembly the Gear,crank Bal Driven(nt:46) is the most expensive.
eleven components are shown in this Lt250ef Quad Racer 1986 (g) Usa (e03) Quadracer Quad-racer Crank Balancer exploded diagram.