Adjusting The Carburetor; Adjusting The Engine Idling Speed - Yamaha XT250 2009 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.
NOTICE
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 ADJUSTMENT
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
G
The engine is warm when it quickly
ECA10550
responds to the throttle.
G
A diagnostic tachometer is needed
to make this adjustment.
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
1. Throttle stop screw
TIP
If the specified idling speed cannot be
obtained as described above, have a
Yamaha dealer make the adjustment.
7-15
(a)
(b)
1
Engine idling speed:
1300–1500 r/min
2
3
4
5
6
7
8
9