Carburetor Adjustment; Idle Speed Adjustment - Yamaha Virago XV250P Owner's Manual

EUU42400
CAUTION:
The engine should never be run without
the air filter element installed; excessive
piston and/or cylinder wear may result.
EAH93100

Carburetor adjustment

The carburetors are important parts of the en-
gine and requires very sophisticated adjust-
ment. Most adjustments should be left to a
Yamaha dealer who has the professional
knowledge and experience to do so. Howev-
er, the following may be serviced by the own-
er as part of routine maintenance.
EUU13700
NOTE:
A diagnostic tachometer must be used for this
procedure.
EUU47100
CAUTION:
The carburetors were set at the Yamaha
factory after many tests. If they are
changed, poor engine performance and
damage may result.
EAH92002

Idle speed adjustment

EUU13700
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 ap-
proximately 1,000 to 2,000 r/min. Occa-
sionally rev the engine to 4,000 to
5,000 r/min. The engine is warm when it
quickly responds to the throttle.
2. Set the idle to the specified engine speed
by adjusting the throttle stop screw. Turn
the screw in direction a to increase en-
gine speed and in direction b to de-
crease engine speed.
7-12