Parts such as the Middle Drive Gear: Shim, Pinion, Housing, Bearing, Collar (4x7), Washer, Thrust are included in the Xv1100 1991 3lp2 Germany 223lp-332g1 Middle Drive Gear parts fiche.
Of all the components used in this assembly the Middle Gear Comp. is the most expensive.
The Yamaha MIDDLE DRIVE GEAR has twenty-seven products enlisted in the schematic.