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Periodic maintenance and adjustment
direction (a). To decrease the en-
gine idling speed, turn the screw in
direction (b).
1. Throttle stop screw
7
Engine idling speed:
1600–1800 r/min
TIP
If the specified idling speed cannot be
obtained as described above, have a
Yamaha dealer make the adjustment.
Checking the throttle grip free
play
Measure the throttle grip free play as
(a)
(b)
shown.
1
1. Throttle grip free play
Throttle grip free play:
4.0–6.0 mm (0.16–0.24 in)
Periodically check the throttle grip free
play and, if necessary, have a Yamaha
dealer adjust it.
EAU21386
Valve clearance
The valves are an important engine
component, and since valve clearance
changes with use, they must be
checked and adjusted at the intervals
specified in the periodic maintenance
chart. Unadjusted valves can result in
improper
noise, and eventually engine damage.
To prevent this from occurring, have
1
your Yamaha dealer check and adjust
the valve clearance at regular intervals.
TIP
This service must be performed when
the engine is cold.
7-15
EAU21403
air-fuel
mixture,
engine
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Troubleshooting
