Adjust the engine idle speed periodically on the engine at normal operating temperature.
To adjust the idle speed:

Engine oil and filter change
Throtile cable playEngine components removable with the
engine in place
Engine components which can be removed while the engine is installed on the
frame are as follows. For the installing
and removing procedures, refer to respective paragraphs describing each
component.
Center of engine
Item
Removal
Inspection
Installation
...
Exterior parts removal and installation
Side frame cover
Removal
Note
the left and right side frame covers are
installed symmetrically and therefore the
removal/installation procedure for one side is
the same as that for the other side.
Remove the bolt (1).
Remove the side frame cover (2).
...
Balancer shaft journal bearing removal and
installation
Refer to “engine bottom side disassembly” (page 1d-
49).
Refer to “engine bottom side assembly” .
Removal
Remove the balancer shaft journal bearings (1).
Note
do not remove the bearings (1) unless
absolutely necessary.
Make a note of where the bearings are
r ...