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 InspectionSwitch Inspection
Using a hand tester, check to see that only the connections
shown in the table have continuity.
Special Tool - Hand Tester: 57001-1394
For the switch housings and the ignition switch, refer to
the tables in the Wiring Diagram.
If the switch has an open or short, repair it or replace it
w ...
Serial number locations
The engine and frame serial numbers are used to register the motorcycle.
They
are the only means of identifying your particular machine from others of the
same
model type. These serial numbers may be needed by your dealer when ordering
parts. In the event of theft, the investigating authoriti ...
Exhaust Pipe Installation
Replace the exhaust pipe gaskets [A] and premuffler
chamber gasket [B] with new ones.
Install the premuffler chamber gasket to the premuffler
chamber [C] until it is bottomed so that the chamfer side
faces exhaust pipe [D].
Install the exhaust pipe clamp [E] as shown in the figure.
I ...