Of all the components used in this assembly the Battery Assy (12v) is the most expensive.
The component with the lowest price in the BATTERY schematic is the Washer.
The eleven Gsxr750 1990 (l) (e01 E02 E04 E15 16 17 18 21 22 24 25 34 39 53) Battery component parts are all listed in this schematic.
