★ If the shaft is bent, straighten or replace it.
★ If the serration are damaged, replace the shaft.
★ If the springs [В] [C] are damaged in any way, replace them.
★ If the shift mechanism arm [D] is damaged in any way, replace the arm.
Check the return spring pin [A] is not loose.
★ If it is loose, unscrew it, apply a non-permanent locking agent to the threads, and tighten it.
Torque - Shift Shaft Return Spring Pin: 28 N·m (2.9 kg·m, 21 ft·lb)
Check the gear positioning lever [B] and it spring for breaks or distortion.
★ If the lever or spring are damaged in any way, replace them.
Visually inspect the shift drum cam [С].
★ If it is badly worn or if it show any damage, replace it.