Yamaha Road Star XV1600A 2000, Owner'S Manual

Page: 63 / 103

PERIODIC MAINTENANCE AND MINOR REPAIR
6-15
6
EAU00629
Adjusting the carburetor
The carburetor is an important part of
the engine and requires very sophisti-
cated adjustment. Therefore, most car-
buretor adjustments should be left to a
Yamaha dealer, who has the neces-
sary professional knowledge and expe-
rience. The adjustment described in
the following section, however, may be
serviced by the owner as part of routine
maintenance.
EC000094
CAUTION:
@
The carburetor has been set and ex-
tensively tested at the Yamaha fac-
tory. Changing these settings
without sufficient technical knowl-
edge may result in poor perfor-
mance of or damage to the engine.
@
EAU03397
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 lubrication
chart.
NOTE:
@
A diagnostic tachometer is needed to
make this adjustment.
@
1. Attach the tachometer to the spark
plug lead.
2. Start the engine and warm it up for
several minutes at 1,000–
2,000 r/min while occasionally rev-
ving it to 3,500–4,000 r/min.
NOTE:
@
The engine is warm when it quickly re-
sponds to the throttle.
@
3. Check the engine idling speed
and, if necessary, adjust it to spec-
ification by turning the throttle stop
screw. To increase the engine
idling speed, turn the screw in di-
rection
a
. To decrease the engine
idling speed, turn the screw in di-
rection
b
.
1. Throttle stop screw
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