6-13
PERIODIC MAINTENANCE AND MINOR REPAIR
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9
EAU00632
Adjusting the engine idling
speed
The engine idling speed must be
checked and, if necessary, adjusted
as follows at the intervals specified in
the periodic maintenance and lubrica-
tion chart.
1. Start the engine and warm it up
for several minutes at
1,000–2,000 r/min while occa-
sionally revving it to 4,000–5,000
r/min.
NOTE:
The engine is warm when it quickly
responds to the throttle.
2. Check the engine idling speed
and, if necessary, adjust it to
specification by turning the throt-
tle stop screw.
EAU00629
Adjusting the carburetor
The carburetor is an important part of
the engine and requires very sophisti-
cated adjustment. Therefore, most
carburetor adjustments should be left
to a Yamaha dealer, who has the
necessary professional knowledge
and experience. The adjustment
described in the following section,
however, may be serviced by the
owner as part of routine mainte-
nance.
EC000094
cC
The carburetor has been set and
extensively tested at the Yamaha
factory. Changing these settings
without sufficient technical knowl-
edge may result in poor perfor-
mance of or damage to the engine.
EC000082
cC
8 Make sure that the air filter ele-
ment is properly seated in the
air filter case.
8 The engine should never be
operated without the air filter
element installed, otherwise
the piston(s) and/or cylinder(s)
may become excessively
worn.
5. Install the air filter case cover by
installing the screws.
6. Install the panel.
1. Arrow mark
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