Adjusting The Carburetor; Adjusting The Engine Idling; Speed - Yamaha 2008 XV250X Owner's Manual

PERIODIC MAINTENANCE AND MINOR REPAIR
CAUTION:
G
Make sure that the air filter ele-
ment is properly seated in the
air filter case.
G The engine should never be op-
erated without the air filter ele-
ment installed, otherwise the
piston(s) and/or cylinder(s) may
become excessively worn.
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
6
filter case joint, and then tighten
the clamp screw.
12. Install the air filter case bolts.
ECA10480

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
without sufficient technical knowl-
edge may result in poor perfor-
mance of or damage to the engine.
6-11
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.
NOTE:
G The engine is warm when it quickly
ECA10550
responds to the throttle.
G
A diagnostic tachometer is needed
to make this adjustment.
these settings
1. Attach the tachometer to the spark
plug lead.
2. 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 en-
gine idling speed, turn the screw in
direction (b).
EAU21340