PERIODIC MAINTENANCE AND MINOR REPAIR
6-15
6
EAU01168
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.
NOTE:
@
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 1,000–
2,000 r/min while occasionally rev-
ving it to 4,000–5,000 r/min.
NOTE:
@
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 engine
idling speed, turn the screw in di-
rection
b
.
NOTE:
@
If the specified idling speed cannot be
obtained as described above, have a
Yamaha dealer make the adjustment.
@
EAU00635
Adjusting the throttle cable
free play
The throttle cable free play should
measure 4–6 mm at the throttle grip.
Periodically check the throttle cable
free play and, if necessary, have a
Yamaha dealer adjust it.
1. Throttle stop screw
Engine idling speed:
1,150–1,250 r/min
a. Throttle cable free play
E_5bn.book Page 15 Monday, November 13, 2000 9:11 AM
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