If any is worn down to the service limit, replace the brush assy.
Starter Motor Brush Length [B] Standard: 12.05 mm (0.4744 in.) Service Limit: 6.55 mm (0.258 in.)

Starter Motor Assembly
Commutator Cleaning and InspectionAir Intake Duct Assembly (US, CA and CAL Models)
Install the dampers [A] and seal [B] as shown in the figure.
Fit the holder [C] to the air intake ducts [D].
Projections [E] and Holes [F]
Grooves [G] and Ribs [H]
Tighten:
Torque - Air Intake Duct Assembly Screws [I]: 1.5 N·m (0.15
kgf·m, 13 in·lb)
Turn the plug [J] so that ...
Rocker Arm Removal
Squeeze the brake lever slowly and hold it with a band.
Remove the front footpeg bracket bolts.
Raise the rear wheel off the ground with the jack (see
Rear Shock Absorber Removal).
Special Tools - Jack: 57001-1238
Jack Attachment: 57001-1608
Remove:
Lower Rear Shock Absorber B ...
Parts Location
NOTE
The front and rear wheel rotation sensors and rotors are
standard parts of this motorcycle.
Front Wheel Rotation Sensor [A]
Front Wheel Rotation Sensor Rotor [B]
Rear Wheel Rotation Sensor [C]
Rear Wheel Rotation Sensor Rotor [D]
ABS Indicator Light (LED) [E]
KIBS Indicator Ligh ...