If there are notches worn into the splines, replace the sub clutch hub. Also, replace the steel plates if their teeth are damaged.

Clutch Housing Finger Inspection
Damper Cam InspectionExploded View
AL: Tighten the two clamp bolts alternately two times to ensure even
tightening torque.
HG: Apply high-temperature grease.
R: Replacement Parts
WL: Apply soap and water solution or rubber lubricant.
Specifications
WARNINGSome replacement tires may adversely
affect h ...
Gear Position Indicator
The gear position indicator shows the
corresponding gear positions where
the transmission is shifted.
For example, when the transmission
is in 6th gear, “6” is displayed.
A. Gear Position Indicator (Normal mode)
NOTE
If the gear position is in the neutral
position, the gear positio ...
Air Suction Valve Installation
Install the air suction valve so that opening [A] of the reed
faces downward.
Apply a non-permanent locking agent to the threads of
the air suction valve cover bolts [A], and tighten them.
Torque - Air Suction Valve Cover Bolts: 9.8 N·m (1.0 kgf·m,
87 in·lb)
...