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 InspectionWheel Rotation Sensor Air Gap Inspection
Raise the front/rear wheel off the ground (see Front/Rear
Wheel Removal in the Wheels/Tires chapter).
Measure the air gap between the sensor and sensor rotor
at several points by turning the wheel slowly.
Thickness Gauge [A]
Wheel Rotation Sensor Air Gap
Standard:
Front 0.4 1.6 mm ...
KIBS Troubleshooting Outline
When an abnormality in the system occurs, the ABS indicator
light (LED) and KIBS indicator light (LED) light up and
the KIBS warning symbol are displayed on the LCD (Liquid
Crystal Display) to alert the rider. In addition, the nature of
the fault is stored in the memory of the KIBS hydraulic uni ...
Tire Air Pressure Inspection
Remove the air valve cap.
Measure the tire air pressure with an air pressure gauge
[A] when the tires are cold (that is, when the motorcycle
has not been ridden more than a mile during the past 3
hours).
Install the air valve cap.
Adjust the tire air pressure according to the specifi ...