Adjusting The Carburetors; Adjusting The Engine Idling Speed - Yamaha VMAX VMX12 Owner's Manual

Adjusting the carburetors

The carburetors are important parts of
the engine and require 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
serviced by the owner as part of routine
maintenance.
CAUTION:
@
The carburetors have been set and
extensively tested at the Yamaha
factory. Changing these settings
without sufficient technical knowl-
edge may result in poor perfor-
mance of or damage to the engine.
@
PERIODIC MAINTENANCE AND MINOR REPAIR
EAU00630
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.
1. Start the engine and warm it up for
several minutes
2,000 r/min while occasionally rev-
ving it to 4,000–5,000 r/min.
EC000095
NOTE:
@
The engine is warm when it quickly re-
sponds to the throttle.
@
EAU00632
1. Throttle stop screw
at 1,000–
2. Check the engine idling speed
NOTE:
@
If the specified idling speed cannot be
obtained as described above, have a
Yamaha dealer make the adjustment.
@
6-20
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 engine
idling speed, turn the screw in di-
rection b.
Engine idling speed:
950–1,050 r/min
6