The upper and lower crankcase halves are ma-
chined at the factory in the assembled state, so the
crankcase halves must be replaced as a set.
With a high flash-point solvent, clean off the mating sur-
faces of the crankcase halves and wipe dry.
Gasoline and low flash-point solvents can be
flammable and/or explosive and cause severe
Clean the crankcase in a well-ventilated
area, and take care that there are no sparks or
flame anywhere near the working area; this in-
cludes any appliance with a pilot light. Do not use
gasoline or a low flash-point solvent to clean the
Using compressed air, blow out the oil passages in the
Upper Crankcase Assembly
When installing the breather plate note the following.
Replace the gasket [A] with a new one.
Apply a non-permanent locking agent to the threads of
the bolts [A] and tighten them.
Torque - Breather Plate Bolts: 9.8 N·m (1.0 kgf·m, 87 in·lb)