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Adjusting The Carburetor; Adjusting The Engine Idling Speed - Yamaha PW50Y Owner's Manual

Yamaha motorcycle user manual.
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1
1. Spark arrester
3. Insert the tailpipe into the muffler,
and then install and tighten the
screw.
TIP
Make sure to align the screw hole when
inserting the tailpipe.
PERIODIC MAINTENANCE AND ADJUSTMENT

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.
7-11
EAU39930
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.
TIP
A diagnostic tachometer is needed to
make this adjustment.
ECA10550
1. Attach the tachometer to the spark
plug lead.
2. Start the engine and warm it up for
several minutes at 1000–2000 r/
settings
min while occasionally revving it to
4000–5000 r/min.
TIP
The engine is warm when it quickly re-
sponds to the throttle.
3. 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
EAU21362
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