NOTICE
Never drop the air switching valve especially on a hard surface. Such a shock to the air switching valve can damaged it.

Air Suction Valve Inspection
Air Switching Valve InstallationCrankshaft Removal
Split the crankcase (see Crankcase Splitting).
Remove:
Connecting Rod Big End Nuts [A]
Connecting Rod Big End Caps [B]
NOTE
Mark and record the locations of the connecting rods
and their big end caps so that they can be reassembled
in their original positions.
Remove the crank ...
Starter Clutch Inspection
Remove:
Torque Limiter Cover (see Torque limiter Removal)
Turn the torque limiter [A] by hand. The torque limiter
should turn forward freely [B], but should not turn backward.
If the starter clutch does not operate as it should or if it
makes noise, go to the next step.
Disassem ...
Brake Disc Installation
Install the brake disc on the wheel so that the marked side
[A] faces out.
Front Brake Discs [B]
Rear Brake Disc [C]
Apply a non-permanent locking agent to the threads of
the brake disc mounting bolts.
Tighten:
Torque - Brake Disc Mounting Bolts: 27 N·m (2.8 kgf·m, 20
...