Yamaha 2008 WR250X User Manual

PERIODIC MAINTENANCE AND ADJUSTMENT
7-26
2
3
4
5
6
7
8
9
5. If the drive chain slack is incorrect,
adjust it as follows.
EAU22943
To adjust the drive chain slack
1. Loosen the axle nut and the lock-
nut on each side of the swingarm.
2. To tighten the drive chain, turn the
drive chain slack adjusting bolt on
each side of the swingarm in direc-
tion (a). To loosen the drive chain,
turn the adjusting bolt on each side
of the swingarm in direction (b),
and then push the rear wheel for-
ward. NOTICE: Improper drive
chain slack will overload the en-
gine as well as other vital parts
of the motorcycle and can lead
to chain slippage or breakage.
To prevent this from occurring,
keep the drive chain slack with-
in the specified limits. [ECA10571]
TIP
Using the alignment marks on each
side of the swingarm, make sure that
both chain pullers are in the same posi-
tion for proper wheel alignment.
3. Tighten the locknuts, and then
tighten the axle nut to the specified
torque.
1. Drive chain slack
2. Chain support mounting bolt
3. Chain tensioner
1
3
2
1. Axle nut
2. Locknut
3. Drive chain slack adjusting bolt
4. Alignment marks
1
3
2
4
(b)
(a)
Tightening torque:
Axle nut:
125 Nm (12.5 m·kgf, 90.4 ft·lbf)

Yamaha 2008 WR250X Specifications

General

Displacement	250cc
Bore x Stroke	77.0mm x 53.6mm
Compression Ratio	11.8:1
Fuel System	Fuel Injection
Transmission	5-speed
Final Drive	Chain
Front Brake	298mm hydraulic disc
Rear Brake	230mm hydraulic disc
Front Tire	110/70-17
Rear Tire	140/70-17
Seat Height	35.2 in
Fuel Capacity	2.0 gal
Wet Weight	298 lb
Ignition	TCI
Engine Type	Liquid-cooled, 4-stroke, DOHC, 4-valve
Rear Suspension	Single shock; adjustable preload and rebound damping