Replace it if necessary.

Inner Tube Inspection
Spring Tension InspectionPiston Wear Inspection
Measure the outside diameter [A] of each piston 5 mm
(0.20 in.) [B] up from the bottom of the piston at a right
angle to the direction of the piston pin.
If the measurement is under service limit, replace the piston.
Piston Diameter
Standard: 75.959 75.974 mm
(2.9905 2.9911 in.)
...
Starter Clutch Assembly
Install the one-way clutch [A] to the driven gear.
Face the circlip side of the one-way clutch to inside.
Install the new snap ring [B] to the one-way clutch.
Install the drive gear [C] while turn it counterclockwise [D].
Apply molybdenum disulfide oil solution to the needle
bearing ...
Rear Caliper Removal
Remove:
Bolt [A]
Rear Wheel Rotation Sensor [B]
Loosen the banjo bolt [C] at the brake hose lower end,
and tighten it loosely.
Loosen the caliper holder pin [D].
Remove the rear wheel (see Rear Wheel Removal in the
Wheels/Tires chapter).
Unscrew the banjo bolt and remove t ...