PERIODIC MAINTENANCE AND MINOR REPAIR
5. Tap the air filter lightly to remove
most of the dust and dirt and blow
out the remaining dirt with com-
pressed air as shown. If the air fil-
6
ter is damaged, replace it.
6. Reassemble by reversing the re-
moval procedure.
CAUTION:
@
Make sure the air filter is prop-
erly seated in the air filter case.
The engine should never be run
without the air filter installed.
Excessive piston and/or cylin-
der wear may result.
@
Carburetor adjustment
The carburetors are important parts of
the engine and require very sophisti-
cated adjustment. Most adjustments
should be left to a Yamaha dealer who
has the professional knowledge and
experience to do so. However, the idle
speed may be adjusted by the owner
as part of routine maintenance.
CAUTION:
@
The carburetors were set at the
Yamaha factory after many tests. If
they are changed, poor engine per-
formance and damage may result.
@
EC000082
6-11
EAU00630
Idle speed adjustment
1. Start the engine and warm it up for
a few minutes at approximately
1,000 to 2,000 r/min. Occasionally
rev the engine to 4,000 to
5,000 r/min. The engine is warm
when it quickly responds to the
throttle.
EC000095
EAU00632