Adjusting The Carburetor; Adjusting The Engine Idling Speed - Yamaha 2005 Virago XV250T Owner's Manual

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 ser-
viced by the owner as part of routine
maintenance.
CAUTION:
The carburetor has been set and ex-
tensively tested at the Yamaha fac-
tory. Changing these
without sufficient technical knowl-
edge may result in poor perfor-
mance of or damage to the engine.
PERIODIC MAINTENANCE AND MINOR REPAIR
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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.
The engine should be warm before
making this adjustment.
NOTE:
The engine is warm when it quickly re-
ECA10550
sponds to the throttle.
Check the engine idling speed and, if
necessary, adjust it to specification by
settings
turning the throttle stop screw. To in-
crease the engine idling speed, turn the
screw in direction (a). To decrease the
engine idling speed, turn the screw in
direction (b).
EAU21320
1. Throttle stop screw
NOTE:
If the specified idling speed cannot be
obtained as described above, have a
Yamaha dealer make the adjustment.
6-11
Engine idling speed:
1250–1350 r/min
6