10.FINAL REDUCTION/ TRANSMISSION SYSTEM MXU 250R/300R Guide Bar Upper Shift Fork Remove the transmission guide bar. Remove the upper shift fork. Shift Cam Lower Shift Fork Remove the shift cam. Remove the lower shift fork. Countershaft Driveshaft Remove the countershaft and driveshaft as an assembly. Disassemble the countershaft and the driveshaft. Keep track of the disassembled parts (gears, washer and clip) by stacking them on a tool or slipping them onto a piece of wire. 10-30