If a master cylinder or piston shows any damage, replace them.

If a cup is worn, damaged softened (rotted), or swollen, the piston assembly should be replaced to renew the cups.
If fluid leakage is noted at the brake lever, the piston assembly should be replaced to renew the cups.
If they are damaged, replace them.
If the springs are damaged, replace them.
If the relief port becomes plugged, the brake pads will drag on the disc. Blow the ports clean with compressed air.
Front Master Cylinder [I] Rear Master Cylinder [J]

Rear Master Cylinder Installation
Brake DiscClutch
Due to friction plate wear and clutch
cable stretch over a long period of use,
the clutch operation should be checked
each day before riding the motorcycle,
and must be adjusted in accordance
with the Periodic Maintenance Chart.
Inspection
Check that the clutch lever operates
properly an ...
Vehicle-down Sensor Input Voltage Inspection
NOTE
Be sure the battery is fully charged.
Turn the ignition switch to OFF.
Disconnect the vehicle-down sensor connector and connect
the measuring adapter [A] between these connectors
as shown in the figure.
Main Harness [B]
Vehicle-down Sensor [C]
Special Tool - Measuring Adapte ...
Connecting Rod Installation
NOTICE
To minimize vibration, the connecting rods should
have the same weight mark.
Big End Cap [A]
Connecting Rod [B]
Weight Mark, Alphabet [C]
Diameter Mark [D] (“” or No Mark)
NOTICE
If the connecting rods, big end bearing inserts, or
crankshaft are replaced with new ones, select ...