Inspect the camshaft sprocket in the following procedures:
If they are worn or damaged, replace the sprocket/ camshaft assembly and cam chain as a set.

Camshaft inspection
Cam chain tension adjuster inspectionSprocket mounting drum dust seal / bearing removal and installation
Removal
Remove the rear wheel assembly. Refer to “rear wheel assembly removal
and installation” in section 2d .
Remove the rear sprocket mounting drum assembly
(1). Refer to “rear sprocket / rear sprocket
mounting drum removal and installation” (page 3a-
3).
Remove the ...
Gearshift shaft oil seal / bearing removal and installation
Removal
Remove the gearshift shaft. Refer to “gearshift shaft / gearshift cam
plate removal and installation” .
Remove the gearshift shaft oil seal (1).
Remove the bearings (2) and (3) with the special
tools.
Special tool
(a): 09921–20210 (bearing remover
(12
mm))
...
Gearshift shaft / gearshift cam plate components
Gearshift shaft
Gearshift cam drive plate
Gearshift cam plate
Gearshift cam stopper
19 N·m (1.9 Kgf-m,
13.5 Lbf-ft)
13 N·m
(1.3 Kgf-m, 9.5 Lbf-ft)
8.5 N·m
(0.85 Kgf-m, 6.0 Lbf-ft)
Apply grease to oil
seal lip.
Apply thread l ...