Yamaha Wr250r 2008 Manual

 
ENGINE SPECIFICATIONS 
2-6 
Piston ring 
Top ring
Ring type Barrel
Dimensions (B  
× 
 T) 0.90  
×  
 2.75 mm (0.04   
×  
 0.11 in)
End gap (installed) 0.15 
–  
0.25 mm (0.0059  
–  
0.0098 in)
Limit 0.50 mm (0.0197 in)
Ring side clearance 0.030 
–  
0.065 mm (0.0012  
–  
0.0026 in)
Limit 0.115 mm (0.0045 in)
2nd ring
Ring type Taper
Dimensions (B  
× 
 T) 0.80  
×  
 2.75 mm (0.03   
×  
 0.11 in)
End gap (installed) 0.30 
–  
0.45 mm (0.0118  
–  
0.0177 in)
Limit 0.80 mm (0.0315 in)
Ring side...

 
ENGINE SPECIFICATIONS 
2-7 
Friction plate thickness 2.90 
–  
3.10 mm (0.114  
–  
0.122 in)
Wear limit 2.80 mm (0.1102 in)
Plate quantity 7 pcs
Clutch plate thickness 1.50 
–  
1.70 mm (0.059  
–  
0.067 in)
Plate quantity 6 pcs
Warpage limit 0.10 mm (0.0039 in)
Clutch spring free length 41.20 mm (1.62 in)
Minimum length 39.14 mm (1.54 in)
Spring quantity 5 pcs
Push rod bending limit 0.100 mm (0.0039 in) 
Transmission 
Transmission type Constant mesh 6-speed
Primary reduction system Spur gear
Primary...

 
ENGINE SPECIFICATIONS 
2-8 
Oil temperature 60.0  
°  
C (140.00   
°  
F)
Throttle cable free play 3.0 
–  
5.0 mm (0.12  
–  
0.20 in) 

 
CHASSIS SPECIFICATIONS 
2-9 
EAS20300 
CHASSIS SPECIFICATIONS 
Chassis 
Frame type Semi double cradle
Caster angle WR250R 26.67  
°  
WR250X 25.33   
°  
Trail WR250R 111.0 mm (4.37 in)
WR250X 76.0 mm (2.99 in) 
Front wheel 
Wheel type Spoke wheel
Rim size WR250R 21x1.60
WR250X 17M/C x MT3.00
Rim material Aluminum
Wheel travel 270.0 mm (10.63 in)
Radial wheel runout limit 2.0 mm (0.08 in)
Lateral wheel runout limit 2.0 mm (0.08 in)
Wheel axle bending limit 0.50 mm (0.02 in) 
Rear wheel 
Wheel type...

 
CHASSIS SPECIFICATIONS 
2-10 
Front brake 
Type Single disc brake
Operation Right hand operation
Front brake lever free play 5.0 
–  
8.0 mm (0.20  
–  
0.31 in)
Front disc brake
Disc outside diameter  
× 
 thickness WR250R 250.0  
×  
 3.5 mm (9.84   
×  
 0.14 in)
WR250X 298.0   
×  
 4.0 mm (11.73   
×  
 0.16 in)
Brake disc thickness limit WR250R 3.0 mm (0.12 in)
WR250X 3.5 mm (0.14 in)
Brake disc deflection limit 0.15 mm (0.0059 in)
Brake pad lining thickness (inner) WR250R 4.8 mm (0.19 in)
WR250X...

 
CHASSIS SPECIFICATIONS 
2-11 
Recommended oil Suspension oil 01
Quantity 613.0 cm 
3
 
 (20.73 US oz) (21.62 Imp.oz)
Level 105.0 mm (4.13 in)
Rebound damping adjusting positions
Minimum 12
Standard 10
Maximum 1
Compression damping adjusting positions
Minimum 19
Standard 10
Maximum 1 
Rear suspension 
Type Swingarm (link suspension)
Spring/shock absorber type Coil spring/gas-oil damper
Rear shock absorber assembly travel 95.0 mm (3.74 in)
Spring free length 220.0 mm (8.66 in)
Installed length 211.5 mm...

 
ELECTRICAL SPECIFICATIONS 
2-12 
EAS20310 
ELECTRICAL SPECIFICATIONS 
Voltage 
System voltage 12 V 
Ignition system 
Ignition system TCI (digital)
Advancer type Digital
Ignition timing (B.T.D.C.) 10.0  
° 
Engine control unit 
Model/manufacturer TBDF88/DENSO 
Ignition coil 
Model/manufacturer F6T558/MITSUBISHI
Primary coil resistance 1.19 
–  
1.61   
Ω  
Secondary coil resistance 8.50 
–  
11.50 k  
Ω 
AC magneto 
Model/manufacturer F3D7/YAMAHA
Standard output 14.0 V, 350 W@5000 r/min
Stator coil...

 
ELECTRICAL SPECIFICATIONS 
2-13 
Starter motor 
Model/manufacturer SM-14/MITSUBA
Power output 0.50 kW
Armature coil resistance 0.0040 
–  
0.0050   
Ω  
Brush overall length 10.0 mm (0.39 in)
Limit 3.50 mm (0.14 in)
Brush spring force 7.16 
–  
9.52 N (25.77  
–  
34.27 oz) (730  
–  
971 gf)
Commutator diameter 28.0 mm (1.10 in)
Limit 27.0 mm (1.06 in)
Mica undercut (depth) 0.70 mm (0.03 in) 
Starter relay 
Model/manufacturer A3943-072/JIDECO
Amperage 180.0 A
Coil resistance 4.18 
–  
4.62   
Ω 
Horn...

 
ELECTRICAL SPECIFICATIONS 
2-14 
Spare fuse 15.0 A
Spare fuse 10.0 A
Spare fuse 7.5 A 

 
TIGHTENING TORQUES 
2-15 
EAS20320 
TIGHTENING TORQUES 
EAS20330 
GENERAL TIGHTENING TORQUE 
SPECIFICATIONS 
This chart specifies tightening torques for stan-
dard fasteners with a standard ISO thread pitch.
Tightening torque specifications for special com-
ponents or assemblies are provided for each
chapter of this manual. To avoid warpage, tight-
en multi-fastener assemblies in a crisscross pat-
tern and progressive stages until the specified
tightening torque is reached. Unless otherwise
specified,...