Carburetor Adjustment; Idle Speed Adjustment - Yamaha Virago XV125S Owner's Manual

PERIODIC MAINTENANCE AND MINOR REPAIR

Carburetor adjustment

The carburetor is a vital part of the
engine and requires very sophisti-
1
cated adjustment. Most adjust-
ments should be left to a Yamaha
2
dealer who has the professional
knowledge and experience to do
3
so. However, the following may be
serviced by the owner as part of
4
routine maintenance.
cC
5
The carburetor was set at the
Yamaha factory after many tests. If
6
the settings are changed, poor
engine performance and damage
7
may result.
8
9
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Idle speed adjustment

NOTE:
A diagnostic tachometer must be
used for this procedure.
1. Attach the tachometer. Start
the engine and warm it up for
a few minutes at approximate-
ly 1,000
Occasionally rev the engine to
EC000094
4,000 to
engine is warm when it quickly
responds to the throttle.
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1. Throttle stop screw
to 2,000 r/min.
5,000 r/min. The
NOTE:
If the specified idle speed cannot
be obtained by performing the
above
Yamaha dealer.
6-15
a
b
1
2. Set the idle to the specified
engine speed by adjusting the
throttle stop screw. Turn the
screw in direction
increase engine speed and in
direction b to decrease engine
speed.
Standard idle speed:
1,300 ~ 1,400 r/min
adjustment, consult
a
to
a