Adjusting The Engine Idling Speed; Checking The Throttle Grip Free Play - Yamaha WR450F Owner's Manual

PERIODIC MAINTENANCE AND ADJUSTMENT
Adjusting the engine idling
speed
1
The engine idling speed must be
checked and, if necessary, adjusted as
follows.
2
TIP
A digital tachometer is needed to make
3
this adjustment.
1. Position the digital tachometer at
4
the ignition coil, which is located in
the spark plug cap.
5
2. Check the engine idling speed
and, if necessary, adjust it to spec-
6
ification by turning the starter
knob/idle adjusting screw. To in-
crease the engine idling speed,
7
turn the screw in direction (a). To
decrease the engine idling speed,
8
turn the screw in direction (b).
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EAU52460
1. Starter knob/idle adjusting screw
Engine idling speed:
1900–2100 r/min
TIP
If the specified idling speed cannot be
obtained as described above, have a
Yamaha dealer make the adjustment.
6-17
Checking the throttle grip free
play
(b)
(a)
1
1. Throttle grip free play
The throttle grip free play should mea-
sure 3.0–5.0 mm (0.12–0.20 in) at the
inner edge of the throttle grip. Periodi-
cally check the throttle grip free play
and, if necessary, have a Yamaha
dealer adjust it.
EAU21384
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