Parts such as the Transmission: Circlip, 25m/m, Gear (42t), Gear (22t), Washer Lock 25mm are included in the Tl250 Trials 1976 Usa Transmission parts fiche.
Of all the components used in this assembly the Countershaft, Trans is the most expensive.
With a quantity of two pieces, the Pin, Shift Fork is the most used part in the TRANSMISSION diagram.