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 DisassemblyStarter Clutch Assembly
Install the one-way clutch [A] to the driven gear.
Face the circlip side of the one-way clutch to inside.
Install the new snap ring [B] to the one-way clutch.
Install the drive gear [C] while turn it counterclockwise [D].
Apply molybdenum disulfide oil solution to the needle
bearing ...
Piston Ring End Gap Inspection
Place the piston ring [A] inside the cylinder (upper
crankcase), using the piston to locate the ring squarely
in place. Set it close to the bottom of the cylinder, where
cylinder wear is low.
Measure the gap [B] between the ends of the ring with a
thickness gauge.
Piston Ring End Gap ...
Piston Wear Inspection
Measure the outside diameter [A] of each piston 5 mm
(0.20 in.) [B] up from the bottom of the piston at a right
angle to the direction of the piston pin.
If the measurement is under service limit, replace the piston.
Piston Diameter
Standard: 75.959 75.974 mm
(2.9905 2.9911 in.)
...