Apply grease to the oil seal lips.
Apply oil to the outer circumference of the oil seal so that it will go into place smoothly.
Install the oil seal to the crankcase so that the surface of the oil seal is flush with the surface of the crankcase.

Transmission Shaft Removal
Refer to the Transmission Assy Disassembly.
Transmission Shaft Installation
Refer to the Transmission Assy Assembly.
Transmission Assy Assembly
Transmission Shaft DisassemblyAir Cleaner Oil Draining
A drain hose is connected to the bottom of the air cleaner
to drain water or oil accumulated in the cleaner part.
Visually check the drain hose [A] if the water or oil accumulates.
If any water or oil accumulates in the hose, remove the
plug [B] from the drain hose and drain it.
...
Crankshaft Sensor Installation
Apply a non-permanent locking agent to the crankshaft
sensor bolts [A].
Tighten:
Torque - Crankshaft Sensor Bolts: 5.9 N·m (0.60 kgf·m, 52
in·lb)
Using a high flash-point solvent, clean off any oil or dirt
that may be on the silicone sealant coating area. Dry
them with a clean cl ...
Transmission Shaft Disassembly
Remove the transmission shafts (see Transmission Shaft
Removal).
Remove the circlips, and then disassemble the transmission
shafts.
Special Tool - Outside Circlip Pliers: 57001-144
The 5th gear [A] on the output shaft has three steel balls
assembled into it for the positive neutral fin ...