Periodic maintenance and adjustment
7-13
7
2. If dirt, water or oil is visible, re-
move the hose, clean it, and then
install it in its original position.
EAU21341
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.
The engine is warm when it quick-
ly responds to the throttle.
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).
If the specified idling speed cannot be
obtained as described above, have a
Yamaha dealer make the adjustment.
1. Air filter check hose
1. Idle adjusting screw
Engine idling speed:
1400–1600 r/min
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