PERIODIC MAINTENANCE AND ADJUSTMENT
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EAU21340
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 quickly
responds to the throttle.
A diagnostic tachometer is needed
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 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
direction (b).
TIP
If the specified idling speed cannot be
obtained as described above, have a
Yamaha dealer make the adjustment.
EAU21374
Adjusting the throttle grip free
play
The throttle grip free play should mea-
sure 3.0–5.0 mm (0.12–0.20 in) as
shown. Periodically 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 ad-
justing the throttle grip free play.
1. Loosen the locknut.
2. To increase the throttle grip free
play, turn the throttle grip free play
1. Throttle stop screw
Engine idling speed:
1250–1350 r/min
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(a)
(b)
1. Throttle grip free play adjusting nut
2. Locknut
3. Throttle grip free play
(b)
(a)
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3HA-9-25.book 12 ページ 2010年11月10日 水曜日 午前9時48分