The O Ring(d:3,id:24.5) is the lowest priced item on this Starting Motor schematic.
Of all the components used in this assembly the Motor Assy,starting is the most expensive.
Parts such as the Starting Motor: Brush Sub Assy,starting Motor, Shim Set,starting Motor, Holder,brush, Bushing are included in the Gz250 Marauder 2004 (k4) Usa (e03) Starting Motor parts fiche.