Yamaha Wr250r 2008 Manual

 
SPECIAL TOOLS 
1-12 
Spacer (crankshaft installer)
90890-04081
Pot spacer
YM-910445-63
Radiator cap tester
90890-01325
Radiator pressure tester
YU-24460-016-2
Radiator cap tester adapter
90890-01352
Radiator pressure tester adapter
YU-339846-2
Steering nut wrench
90890-01403
Spanner wrench
YU-339753-25
Thickness gauge
90890-03180
Feeler gauge set
YU-26900-93-4
Fork seal driver
90890-01442
Adjustable fork seal driver (36 
– 
46 mm)
YM-014424-45  
Tool name/Tool No. IllustrationReference
pages
YM-91044...

 
SPECIAL TOOLS 
1-13 
Damper rod holder
90890-014544-42, 4-44
Spoke nipple wrench (8 
– 
9)
90890-01522
YM-015223-31
Sheave holder
90890-01701
Primary clutch holder
YS-01880-A5-53, 5-54
Compression gauge
90890-03081
Engine compression tester
YU-332233-9
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C1-10, 5-32, 
8-65, 8-66, 
8-67, 8-71, 
8-72, 8-73, 
8-74, 8-75, 
8-76, 8-77, 
8-78, 8-79, 
8-81
Timing light
90890-03141
Inductive clamp timing light
YU-031413-9
Pressure gauge
90890-03153...

 
SPECIAL TOOLS 
1-14 
Digital circuit tester
90890-03174
Model 88 Multimeter with tachometer
YU-A19277-7, 8-80, 8-81
Fuel pressure adapter
90890-03176
YM-031767-6
Middle driven shaft bearing driver
90890-04058
Bearing driver 40 mm
YM-040586-7
Mechanical seal installer
90890-041456-7
Universal clutch holder
90890-04086
YM-910425-38, 5-40
Valve lapper
90890-04101
Valve lapping tool
YM-A89983-5
Valve spring compressor
90890-04019
YM-040195-18, 5-23  
Tool name/Tool No. IllustrationReference
pages 

 
SPECIAL TOOLS 
1-15 
Valve guide remover ( 
ø 
4.5)
90890-04116
Valve guide remover (4.5 mm)
YM-041165-20
Valve guide installer (4.5 
ø 
)
90890-04117
YM-041175-20
Valve guide reamer (4.5 
ø 
)
90890-04118
YM-041185-20
Rotor puller
90890-04142
YM-041425-53
Ignition checker
90890-06754
Opama pet-4000 spark checker
YM-344878-74
Digital tachometer
90890-06760
YU-39951-B3-6, 3-9
Yamaha bond No. 1215 (Three Bond 
No.1215®)
90890-855055-60  
Tool name/Tool No. IllustrationReference
pages 

 
1
2
3
4
5
6
7
8
9
 
SPECIFICATIONS 
GENERAL SPECIFICATIONS .......................................................................2-1
ENGINE SPECIFICATIONS ...........................................................................2-2
CHASSIS SPECIFICATIONS.........................................................................2-9
ELECTRICAL SPECIFICATIONS ..................................................................2-12
TIGHTENING TORQUES...

 
GENERAL SPECIFICATIONS 
2-1 
EAS20280 
GENERAL SPECIFICATIONS 
Model 
Model WR250R 32C1 (U49)
WR250R 32C3 (CAL)
WR250X 32C2 (U49)
WR250X 32C4 (CAL) 
Dimensions 
Overall length WR250R 2175 mm (85.6 in)
WR250X 2110 mm (83.1 in)
Overall width 810 mm (31.9 in)
Overall height WR250R 1230 mm (48.4 in)
WR250X 1190 mm (46.9 in)
Seat height WR250R 930 mm (36.6 in)
WR250X 895 mm (35.2 in)
Wheelbase WR250R 1420 mm (55.9 in)
WR250X 1425 mm (56.1 in)
Ground clearance WR250R 295 mm (11.61 in) (CAL)
WR250R 300 mm...

 
ENGINE SPECIFICATIONS 
2-2 
EAS20290 
ENGINE SPECIFICATIONS 
Engine 
Engine type Liquid cooled 4-stroke, DOHC
Displacement 250.0 cm 
3
 
Cylinder arrangement Forward-inclined single cylinder
Bore  
× 
 stroke 77.0  
×  
 53.6 mm (3.03   
×  
 2.11 in)
Compression ratio 11.80 :1
Starting system Electric starter 
Fuel 
Recommended fuel Premium unleaded gasoline only
Fuel tank capacity WR250R 7.2 L (1.90 US gal) (1.58 Imp.gal) 
(CAL)
 WR250R 7.6 L (2.01 US gal) (1.67 Imp.gal) 
(U49)
 WR250X 7.2 L (1.90 US...

 
ENGINE SPECIFICATIONS 
2-3 
Spark plug (s) 
Manufacturer/model NGK/CR9EK
Spark plug gap 0.6 
–  
0.7 mm (0.024  
–  
0.028 in) 
Cylinder head 
Volume 15.36 cm 
3
 
 (0.94 cu.in)
Warpage limit 0.05 mm (0.0020 in) 
Camshaft 
Drive system Chain drive (left)
Camshaft cap inside diameter 22.000 
–  
22.021 mm (0.8661  
–  
0.8670 in)
Camshaft journal diameter 21.959 
–  
21.972 mm (0.8645  
–  
0.8650 in)
Camshaft-journal-to-camshaft-cap clearance 0.028 
–  
0.062 mm (0.0011  
–  
0.0024 in)
Limit 0.08 mm...

 
ENGINE SPECIFICATIONS 
2-4 
Valve face width B (intake) 1.840 mm (0.0724 in)
Valve face width B (exhaust) 2.260 mm (0.0890 in)
Valve seat width C (intake) 0.90 
–  
1.10 mm (0.0354  
–  
0.0433 in)
Valve seat width C (exhaust) 0.90 
–  
1.10 mm (0.0354  
–  
0.0433 in)
Valve margin thickness D (intake) 1.15 
–  
1.45 mm (0.0453  
–  
0.0571 in)
Limit 1.00 mm (0.04 in)
Valve margin thickness D (exhaust) 0.85 
–  
1.15 mm (0.0335  
–  
0.0453 in)
Limit 0.70 mm (0.03 in)
Valve stem diameter (intake) 4.475...

 
ENGINE SPECIFICATIONS 
2-5 
Spring rate K2 (intake) 40.90 N/mm (233.54 lb/in) (4.17 kgf/mm)
Spring rate K1 (exhaust) 31.47 N/mm (179.69 lb/in) (3.21 kgf/mm)
Spring rate K2 (exhaust) 40.90 N/mm (233.54 lb/in) (4.17 kgf/mm)
Installed compression spring force (intake) 147.00 
–  
169.00 N (33.05  
–  
37.99 lbf) 
(14.99  
–  
17.23 kgf)
Installed compression spring force (exhaust) 147.00 
–  
169.00 N (33.05  
–  
37.99 lbf) 
(14.99  
–  
17.23 kgf)
Spring tilt (intake) 2.5  
°/  
1.6 mm
Spring tilt...