Yamaha WR250X User Manual

PERIODIC MAINTENANCE AND ADJUSTMENT
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EAU45323
Adjusting the engine idling
speed
The engine idling speed must be
checked and, if necessary, adjusted as
follows.
TIP
A digital tachometer is needed to make
this adjustment.
1. Position the digital tachometer at
the ignition coil, which is located in
the spark plug cap.
2. Check the engine idling speed
and, if necessary, adjust it to spec-
ification by turning the idle adjust-
ing 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).
TIP
If the specified idling speed cannot be
obtained as described above, have a
Yamaha dealer make the adjustment.
EAU21385
Checking the 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.
1. Idle adjusting screw
Engine idling speed:
1450–1650 r/min
1
(b)
(a)
1. Throttle grip free play
1
32D-28199-EB.book 19 ページ ２０１３年７月３日 水曜日 午前１１時８分

Yamaha WR250X Specifications

General

Displacement	250cc
Bore x Stroke	77.0mm x 53.6mm
Compression Ratio	11.8:1
Fuel System	Fuel Injection
Final Drive	Chain
Front Tire	110/70-17
Rear Tire	140/70-17
Seat Height	35.2 in
Fuel Capacity	2.0 gal
Engine Type	Liquid-cooled DOHC 4-stroke; 4 valves
Ignition	TCI (Transistor Controlled Ignition)
Front Suspension	Inverted fork
Rear Suspension	Single shock
Front Brake	298mm hydraulic disc
Rear Brake	230mm hydraulic disc
Transmission	6-speed