Yamaha 2008 WR250R User Manual

PERIODIC MAINTENANCE AND MINOR REPAIR
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the air filter case for accumulated
dirt or water.
2. If dirt or water is visible, remove
the hose, clean it, and then install
it.
EAU45321
Adjusting the engine idling
speed
The engine idling speed must be
checked and, if necessary, adjusted as
follows.
NOTE:
A diagnostic tachometer is needed 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 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).
NOTE:
If the specified idling speed cannot be
obtained as described above, have a
Yamaha dealer make the adjustment.
1. Air filter check hose
1
1. Idle adjusting screw
Engine idling speed:
1450–1650 r/min
1
(b)
(a)

Yamaha 2008 WR250R 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	80/100-21
Rear Tire	120/80-18
Fuel Capacity	2.0 gal
Seat Height	36.6 in
Wet Weight	295 lb
Engine Type	Liquid-cooled, DOHC, 4-valve single
Ignition	TCI (Transistor Controlled Ignition)
Transmission	6-speed
Front Suspension	Inverted fork, fully adjustable; 10.6-in travel
Rear Suspension	Single shock, fully adjustable; 10.6-in travel
Front Brake	Hydraulic disc, 250mm
Rear Brake	Hydraulic disc, 230mm
Wheelbase	55.9 in
Ground Clearance	11.8 in