Yamaha RAPTOR 250 Service Manual Page 79
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- Table of contents
- TROUBLESHOOTING
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CHK
ADJ
3-18
6. Measure:
• Compression pressure
Out of specification → Refer to steps (c)
and (d).
a. Set the main switch to “ON”.
b. With the throttle wide open, crank the
engine until the reading on the compres-
sion gauge stabilizes.
WARNING
To prevent sparking, ground the spark plug
lead before cranking the engine.
c. If the compression pressure is above the
maximum specification, check the cylinder
head, valve surfaces and piston crown for
carbon deposits.
Carbon deposits → Eliminate.
d. If the compression pressure is below the
minimum specification, pour a teaspoonful
of engine oil into the spark plug bore and
measure again.
Refer to the following table.
Compression pressure (standard)
1,100 kPa/720 r/min
(11.2 kgf/cm
2
, 160 psi/720 r/min)
Compression pressure
(maximum)
1,300 kPa/720 r/min
(13.3 kgf/cm
2
, 189 psi/720 r/min)
Compression pressure (minimum)
900 kPa/720 r/min
(9.2 kgf/cm
2
, 131 psi /720 r/min)
Compression pressure
(with oil applied into the cylinder)
Reading Diagnosis
Higher than without
oil
Piston ring(s) wear or
damage → Repair.
Same as without oil
Piston, valves, cylin-
der head gasket or
piston possibly
defective → Repair.
MEASURING THE COMPRESSION PRESSURE
- 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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