Adjusting The Carburetor; Adjusting The Engine Idling; Speed - Yamaha 2011 Star XV250A Owner's Manual

PERIODIC MAINTENANCE AND ADJUSTMENT
engine should never be operat-
ed without the air filter element
installed, otherwise the pis-
ton(s) and/or cylinder(s) may
become excessively
[ECA10481]
9. Install the air filter case cover by in-
stalling the screws.
10. Connect the hoses to the air filter
case.
11. Push the air filter case onto the air
filter case joint, and then tighten
the clamp screw.
12. Install the air filter case bolts.
7

Adjusting the carburetor

The carburetor is an important part of
the engine and requires very sophisti-
cated adjustment. Therefore, most car-
worn.
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.
NOTICE
The carburetor has been set and ex-
tensively tested at the Yamaha fac-
tory. Changing
without sufficient technical knowl-
edge may result in poor perfor-
mance of or damage to the engine.
EAU21280

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.
TIP
ECA10550
these settings
1. Attach the tachometer to the spark
2. Check the engine idling speed
7-14
G The engine is warm when it quickly
responds to the throttle.
G
A diagnostic tachometer is needed
to make this adjustment.
plug lead.
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 en-
gine idling speed, turn the screw in
direction (b).
EAU21340