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PERIODIC MAINTENANCE AND ADJUSTMENT
7-13
7
EAU21362
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.
1. Attach the tachometer to the spark
plug lead.
2. Start the engine and warm it up for
several minutes at 1000–2000
r/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
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
adjusting nut in direction (a). To
1. Throttle stop screw
Engine idling speed:
1300–1500 r/min
1. Throttle grip free play
U39C12E0.book Page 13 Thursday, June 9, 2011 2:29 PM