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 (exhaust)
2.5
°/
1.6 mm
Winding direction (intake)
Clockwise
Winding direction (exhaust)
Clockwise
Cylinder
Bore
77.000
–
77.010 mm (3.0315
–
3.0319 in)
Wear limit
77.100 mm (3.0354 in)
Taper limit
0.050 mm (0.0020 in)
Out of round limit
0.050 mm (0.0020 in)
Piston
Piston-to-cylinder clearance
0.010
–
0.035 mm (0.0004
–
0.0014 in)
Limit
0.10 mm (0.0039 in)
Diameter D
76.975
–
76.990 mm (3.0305
–
3.0311 in)
Height H
12.0 mm (0.47 in)
Offset
0.50 mm (0.0197 in)
Offset direction
Intake side
Piston pin bore inside diameter
17.002
–
17.013 mm (0.6694
–
0.6698 in)
Limit
17.043 mm (0.6710 in)
Piston pin outside diameter
16.991
–
17.000 mm (0.6689
–
0.6693 in)
Limit
16.971 mm (0.6681 in)
Piston-pin-to-piston- pin-bore clearance
0.002
–
0.022 mm (0.0001
–
0.0009 in)
H
D
Summary of Contents for WR250R
Page 1: ...SERVICE MANUAL WR250RX C 2008 32C 28197 10 WR250XX C LIT 11616 21 66 ...
Page 2: ......
Page 8: ......
Page 39: ...ELECTRICAL SPECIFICATIONS 2 14 Spare fuse 15 0 A Spare fuse 10 0 A Spare fuse 7 5 A ...
Page 49: ...LUBRICATION POINTS AND LUBRICANT TYPES 2 24 ...
Page 52: ...LUBRICATION SYSTEM CHART AND DIAGRAMS 2 27 ...
Page 54: ...COOLING SYSTEM DIAGRAMS 2 29 EAS20420 COOLING SYSTEM DIAGRAMS 8 5 1 2 3 4 6 7 9 ...
Page 56: ...CABLE ROUTING 2 31 EAS20430 CABLE ROUTING ...
Page 58: ...CABLE ROUTING 2 33 ...
Page 60: ...CABLE ROUTING 2 35 ...
Page 62: ...CABLE ROUTING 2 37 ...
Page 64: ...Front rear brake hose 2 39 Front rear brake hose ...
Page 66: ...Throttle body 2 41 Throttle body ...
Page 68: ...Canister for California 2 43 Canister for California 5mm 0 20 in 4 5 ...
Page 70: ...Canister for California 2 45 ...
Page 106: ...ELECTRICAL SYSTEM 3 34 a b a b ...
Page 107: ...ELECTRICAL SYSTEM 3 35 ...
Page 108: ...ELECTRICAL SYSTEM 3 36 ...
Page 116: ...FRONT WHEEL 4 6 1 ...
Page 229: ...GENERATOR AND STARTER CLUTCH 5 55 1 2 ...
Page 244: ...TRANSMISSION 5 70 ...
Page 254: ...WATER PUMP 6 9 ...
Page 258: ...FUEL TANK 7 3 1 ...
Page 263: ...THROTTLE BODIES 7 8 ...
Page 264: ...AIR INDUCTION SYSTEM 7 9 EAS27040 AIR INDUCTION SYSTEM 2 1 3 4 ...
Page 271: ......
Page 272: ...IGNITION SYSTEM 8 1 EAS27090 IGNITION SYSTEM EAS27100 CIRCUIT DIAGRAM ...
Page 276: ...ELECTRIC STARTING SYSTEM 8 5 EAS27160 ELECTRIC STARTING SYSTEM EAS27170 CIRCUIT DIAGRAM ...
Page 282: ...CHARGING SYSTEM 8 11 EAS27200 CHARGING SYSTEM EAS27210 CIRCUIT DIAGRAM ...
Page 283: ...CHARGING SYSTEM 8 12 1 AC magneto 2 Rectifier regulator 4 Battery 5 Main fuse ...
Page 285: ...CHARGING SYSTEM 8 14 ...
Page 286: ...LIGHTING SYSTEM 8 15 EAS27240 LIGHTING SYSTEM EAS27250 CIRCUIT DIAGRAM ...
Page 289: ...LIGHTING SYSTEM 8 18 ...
Page 290: ...SIGNALING SYSTEM 8 19 EAS27270 SIGNALING SYSTEM EAS27280 CIRCUIT DIAGRAM ...
Page 295: ...SIGNALING SYSTEM 8 24 ...
Page 296: ...COOLING SYSTEM 8 25 EAS27300 COOLING SYSTEM EAS27310 CIRCUIT DIAGRAM ...
Page 299: ...COOLING SYSTEM 8 28 ...
Page 300: ...FUEL INJECTION SYSTEM 8 29 EAS27330 FUEL INJECTION SYSTEM EAS27340 CIRCUIT DIAGRAM ...
Page 326: ...FUEL PUMP SYSTEM 8 55 EAS27580 FUEL PUMP SYSTEM EAS27590 CIRCUIT DIAGRAM ...
Page 329: ...FUEL PUMP SYSTEM 8 58 ...
Page 332: ...ELECTRICAL COMPONENTS 8 61 2 3 4 9 5 10 14 13 1 6 7 11 12 15 8 ...
Page 334: ...ELECTRICAL COMPONENTS 8 63 EAS27980 CHECKING THE SWITCHES 7 9 8 11 10 4 2 3 5 6 1 ...
Page 358: ...TROUBLESHOOTING 9 5 ...
Page 360: ......
Page 361: ......
Page 362: ...YAMAHA MOTOR CO LTD 2500 SHINGAI IWATA SHIZUOKA JAPAN ...