Adjusting The Carburetors; Adjusting The Engine Idling Speed - Yamaha XVS650H 2016 Owner's Manual

Periodic maintenance and adjustment
TIP
If dust or water collects in the air filter
check hose, remove the clamp from it,
and then remove the plug to drain the
hose.
7
1. Air filter check hose

Adjusting the carburetors

The carburetors are important parts of
the engine and require very sophisti-
cated adjustment. Therefore, most
carburetor adjustments should be left
to a Yamaha dealer, who has the nec-
essary professional knowledge and ex-
perience. The adjustment described in
the following section, however, may be
serviced by the owner as part of rou-
tine maintenance.
NOTICE
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.
7-16
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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
 The engine is warm when it quick-
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ly responds to the throttle.
 A diagnostic tachometer is need-
ed to make this adjustment.
1. Attach the tachometer to the
spark plug lead.
2. Check the engine idling speed
and, if necessary, adjust it to
specification by turning the throt-
tle stop screw. To increase the en-
gine idling speed, turn the screw in
direction (a). To decrease the en-
gine idling speed, turn the screw in
direction (b).
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