Perio
d
ic maintenance an
d
a
d
justment
7-15
7
EAU21341
A
d
justin
g
the en
g
ine i
d
lin
g
spee
d
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
z
The engine is warm when it quick-
ly responds to the throttle.
z
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).
TIP
If the specified idling speed cannot be
obtained as described above, have a
Yamaha dealer make the adjustment.
EAUE1572
A
d
justin
g
the throttle
g
rip free
play
The throttle grip free play should mea-
sure 3.0–7.0 mm (0.12–0.28 in) at the
inner edge of the throttle grip. Periodi-
cally check the throttle grip free play
and, if necessary, adjust it as follows.
TIP
The engine idling speed must be cor-
rectly adjusted before checking and
adjusting the throttle grip free play.
1. Slide the rubber cover at the throt-
tle cable.
2. Loosen the locknut.
1. Throttle stop screw
En
g
ine i
d
lin
g
spee
d
:
1300–1500 r/min
ZAUE2589
1. Throttle grip free play
ZAUE2590
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