PERIODIC MAINTENANCE AND MINOR REPAIR
6-15
6
EAU37520
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.
NOTE:
●
The engine is warm when it quickly
responds to the throttle.
●
A diagnostic tachometer is needed
to make this adjustment.
1. Remove cowling B. (See page
6-5.)
2. Attach the diagnostic tachometer
to the spark plug lead.
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).
NOTE:
If the specified idling speed cannot be
obtained as described above, have a
Yamaha dealer make the adjustment.
4. Install the cowling.
EAU21370
Adjusting the throttle cable
free play
The throttle cable free play should mea-
sure 3.0–7.0 mm (0.12–0.28 in) at the
throttle grip. Periodically check the
throttle cable free play and, if neces-
sary, adjust it as follows.
NOTE:
The engine idling speed must be cor-
rectly adjusted before checking and ad-
justing the throttle cable free play.
1. Loosen the locknut.
1. Throttle stop screw
Engine idling speed:
1300–1500 r/min
1. Throttle cable free play
2. Locknut
3. Adjusting nut
U5YPE0E0.book Page 15 Wednesday, February 23, 2005 4:22 PM
