Yamaha RAPTOR 250 Service Manual Page 142
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- Table of contents
- TROUBLESHOOTING
- BOOKMARKS
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ENG
4-26
3. Measure:
• Valve seat width
Out of specification → Replace the cylinder
head.
a. Apply Mechanic’s blueing dye (Dykem)
onto the valve face.
b. Install the valve into the cylinder head.
c. Press the valve through the valve guide and
onto the valve seat to make a clear impres-
sion.
d. Measure the valve seat width.
N
O
TE:N
O
TE:
Where the valve seat and valve face contacted
one another, the blueing will have been
removed.
4. Lap:
•Valve face
• Valve seat
N
O
TE:N
O
TE:
After replacing the cylinder head or replacing
the valve and valve guide, the valve seat and
valve face should be lapped.
Valve seat width
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 lapper
90890-04101
Valve lapping tool
YM-A8998
VALVES AND VALVE SPRINGS
- YFM250RX 1
- EBS00001 2
- HOW TO USE THIS MANUAL 4
- EBS00006 5
- TABLE OF CONTENTS 7
- CHAPTER 1 8
- CHAPTER 2 8
- CHAPTER 3 9
- CHAPTER 4 10
- CHAPTER 5 12
- CARBURETOR 12
- CHAPTER 6 12
- CHAPTER 7 13
- ELECTRICAL 13
- CHAPTER 8 14
- TROUBLESHOOTING 14
- GENERAL INFORMATION 16
- IMPORTANT INFORMATION 17
- SPECIAL TOOLS 20
- YU-01304 21
- SPECIFICATIONS 24
- GENERAL SPECIFICATIONS 25
- ENGINE SPECIFICATIONS 27
- CHASSIS SPECIFICATIONS 34
- ELECTRICAL SPECIFICATIONS 36
- TIGHTENING TORQUES 38
- HOW TO USE THE CONVERSION 42
- GENERAL TIGHTENING TORQUE 42
- EBS00024 43
- OIL FLOW DIAGRAMS 45
- CABLE ROUTING 48
- INTRODUCTION 62
- Whenever worn to the limit 63
- Every 4 years 63
- 7 Nm (0.7 m•kg, 5.2 ft•Ib) 65
- SEAT, FENDERS AND FUEL TANK 66
- ADJUSTING THE VALVE CLEARANCE 70
- 14 Nm (1.4 m•kg, 10 ft•lb) 71
- EBS00051 72
- EBS00052 73
- ADJUSTING THE SPEED LIMITER 74
- CHECKING THE SPARK PLUG 76
- CHECKING THE IGNITION TIMING 77
- CHECKING THE ENGINE OIL LEVEL 80
- CHANGING THE ENGINE OIL 82
- ADJUSTING THE CLUTCH CABLE/ 84
- CLEANING THE SPARK ARRESTER 86
- ADJUSTING THE REAR BRAKE/ 88
- ADJUSTING THE PARKING BRAKE 88
- 16 Nm (1.6 m•kg, 11 ft•lb) 89
- CHECKING THE FRONT BRAKE PADS 90
- CHECKING THE REAR BRAKE PADS 91
- CHECKING THE BRAKE HOSES 92
- CHECKING THE BRAKE HOSES/ 93
- 21 Nm (2.1 m•kg, 15 ft•lb) 97
- ADJUSTING THE TOE-IN 98
- EBS00111 100
- 42 Nm (4.2 m•kg, 31 ft•lb) 101
- CHECKING THE TIRES 102
- LUBRICATING THE CABLES 104
- EBS00118 105
- ELECTRICAL SYSTEM 106
- Charging time (hours) 107
- CAUTION: 108
- CHECKING THE FUSES 113
- CHECKING THE FUSES/ 114
- ADJUSTING THE HEADLIGHT BEAM 114
- REPLACING A HEADLIGHT BULB 115
- 34 Nm (3.4 m•kg, 25 ft•lb) 117
- 20 Nm (2.0 m•kg, 15 ft•lb) 117
- 8 Nm (0.8 m•kg, 5.9 ft•lb) 117
- 18 Nm (1.8 m•kg, 13 ft•lb) 117
- ENGINE REMOVAL 118
- 10 Nm (1.0 m•kg, 7.4 ft•lb) 119
- 40 Nm (4.0 m 122
- CYLINDER HEAD 123
- ROCKER ARM, CAMSHAFT 131
- VALVES AND VALVE SPRINGS 137
- 17 Nm (1.7 m•kg, 13 ft•lb) 147
- CYLINDER AND PISTON 148
- 73 Nm (7.3 m•kg, 54 ft•lb) 155
- 80 Nm (8.0 m•kg, 59 ft•lb) 156
- 75 Nm (7.5 m•kg, 55 ft•lb) 156
- Lock washer 162
- 6 Nm (0.6 m•kg, 4.4 ft•lb) 166
- 55 Nm (5.5 m•kg, 41 ft•lb) 166
- 7 Nm (0.7 m•kg, 5.0 ft•lb) 168
- Inner rotor 169
- Outer rotor 169
- Oil pump housing 169
- SHIFT SHAFT 174
- 20 Nm (2.0 m•kg, 14.8 ft•lb) 183
- CRANKCASE 184
- CRANKSHAFT ASSEMBLY 188
- TRANSMISSION 193
- 2 Nm (0.2 m•kg, 1.5 ft•lb) 199
- 3.5 Nm (0.4 m•kg, 2.6 ft•lb) 199
- 28 Nm (2.8 m•kg, 21 ft•lb) 206
- 70 Nm (7.0 m•kg, 52 ft•lb) 206
- 45 Nm (4.5 m•kg, 33 ft•lb) 206
- 120 Nm (12.0 m•kg, 89 ft•lb) 208
- FRONT AND REAR WHEELS 209
- 7 Nm (0.7 m•kg, 5.2 ft•lb) 213
- 140 Nm (14.0 m•kg, 103 ft•lb) 213
- REAR AXLE AND REAR AXLE HUB 215
- FRONT AND REAR BRAKES 220
- 5 Nm (0.5 m•kg, 3.7 ft•lb) 221
- 27 Nm (2.7 m•kg, 20 ft•lb) 224
- 31 Nm (3.1 m•kg, 23 ft•lb) 226
- 2.5 Nm (0.25 m•kg, 1.8 ft•lb) 235
- 15 Nm (1.5 m•kg, 11 ft•lb) 238
- 4 Nm (0.4 m•kg, 3.0 ft•lb) 247
- STEERING SYSTEM 249
- 23 Nm (2.3 m•kg, 17 ft•lb) 252
- 25 Nm (2.5 m•kg, 18 ft•lb) 252
- 35 Nm (3.5 m•kg, 26 ft•lb) 252
- ASSEMBLIES 256
- 100 Nm (10.0 m•kg, 74 ft•lb) 260
- 110 Nm (11.0 m•kg, 81 ft•lb) 260
- DRIVE CHAIN 262
- CHECKING SWITCH CONTINUITY 269
- CHECKING THE SWITCHES 270
- CHECKING THE BULBS AND 272
- BULB SOCKETS 272
- IGNITION SYSTEM 275
- ELECTRIC STARTING SYSTEM 280
- STARTER MOTOR 287
- CHARGING SYSTEM 291
- LIGHTING SYSTEM 294
- SIGNAL SYSTEM 298
- Br Sb BrSb 301
- POOR IDLE SPEED PERFORMANCE 304
- FAULTY GEAR SHIFTING 305
- CLUTCH SLIPPING/DRAGGING 305
- OVERHEATING 306
- FAULTY BRAKE 306
- SHOCK ABSORBER MALFUNCTION 306
- FAULTY BRAKE/ 306
- UNSTABLE HANDLING 307
- YAMAHA MOTOR CO., LTD 310
- YFM250RX WIRING DIAGRAM 311
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