Yamaha SR125 Service Manual Page 27
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2-7
MAINTENANCE SPECIFICATIONS
SPEC
TIGHTENING TORQUES
ENGINE
Th d
Tightening
Part to be tightened Part name
Th
rea
d
size
Q’ty
gg
torque
Remarks
g
size
y
Nm
mSkg
Cylinder head blind plug
Cylinder head and cylinder
Cylinder head
(Timing chain side)
Cam sprocket cover
Valve cover
Plate
Spark plug
Cylinder
Buffer boss
C.D.I. magneto
Valve adjuster locknut
Cam sprocket
Timing chain tensioner
(Body)
(Cap)
Timing chain guide (intake)
Oil pump
Oil pump and crankcase
Drain plug
Oil filter cover
Drain bolt (oil filter)
Carburetor joint and carburetor
Carburetor joint and cylinder
Carburetor joint and air filter
Air filter case
Air filter case and frame
Muffler and frame
Exhaust pipe and cylinder
Crankcase (left and right)
Crankcase cover (left)
Crankcase cover (left)
Crankcase cover (right)
Drive sprocket cover
Starter clutch
Kick crank
Primary drive gear
Clutch spring
Clutch boss
Push lever axle
Push lever adjuster
Screw
Bolt
Bolt
Screw
Bolt
Bolt
—
Bolt
Nut
Bolt
Nut
Bolt
Nut
Nut
Bolt
Screw
Screw
Bolt
Screw
Bolt
Screw
Screw
Screw
Screw
Screw
Bolt
Bolt
Screw
Screw
Screw
Screw
Screw
Bolt
Bolt
Nut
Screw
Nut
Screw
Nut
M6
M8
M8
M6
M6
M6
M12
M6
M14
M10
M6
M10
M14
M14
M6
M6
M6
M35
M6
M6
M6
M5
M5
M5
M6
M8
M6
M6
M6
M4
M6
M6
M8
M32
M14
M5
M14
M8
M6
2
4
2
2
5
2
1
2
1
1
2
1
1
1
2
1
3
1
2
1
2
1
1
2
2
2
2
13
9
1
9
2
3
1
1
4
1
1
1
7
22
20
7
10
8
18
10
50
50
14
60
30
5
8
7
7
43
7
10
12
2
4
4
7
20
12
7
7
2
7
7
30
50
6
70
12
8
0.7
2.2
2.0
0.7
1.0
0.8
1.8
1.0
5.0
5.0
1.4
6.0
3.0
0.5
0.8
0.7
0.7
4.3
0.7
1.0
1.2
0.2
0.4
0.4
0.7
2.0
1.2
0.7
0.7
0.2
0.7
0.7
3.0
5.0
0.6
7.0
1.2
0.8
Stake
- EB000000 3
- HOW TO USE THIS MANUAL 5
- ILLUSTRATED SYMBOLS 6
- CHAPTER 1 9
- GENERAL INFORMATION 9
- IMPORTANT INFORMATION 12
- CHECKING OF CONNECTIONS 14
- EB201000 15
- SPECIAL TOOLS 16
- CHAPTER 2 19
- SPECIFICATIONS 19
- GENERAL SPECIFICATIONS 22
- MAINTENANCE SPECIFICATIONS 24
- GENERAL TORQUE SPECIFICATIONS 35
- LUBRICATION DIAGRAM 38
- CABLE ROUTING 40
- CHAPTER 3 45
- PERIODIC INSPECTIONS 45
- AND ADJUSTMENTS 45
- INTRODUCTION/ 47
- INTRODUCTION 47
- VALVE CLEARANCE ADJUSTMENT 50
- VALVE CLEARANCE ADJUSTMENT/ 51
- IDLING SPEED ADJUSTMENT 51
- IDLING SPEED ADJUSTMENT/ 52
- THROTTLE CABLE ADJUSTMENT 52
- THROTTLE CABLE ADJUSTMENT/ 53
- SPARK PLUG INSPECTION 53
- SPARK PLUG INSPECTION/ 54
- IGNITION TIMING CHECK 54
- ENGINE OIL LEVEL INSPECTION 56
- ENGINE OIL LEVEL INSPECTION/ 57
- ENGINE OIL REPLACEMENT 57
- CLUTCH ADJUSTMENT 59
- CLUTCH ADJUSTMENT/ 60
- AIR FILTER CLEANING 60
- AIR FILTER CLEANING/ 61
- EXHAUST SYSTEM INSPECTION 61
- FRONT BRAKE ADJUST MENT/ 63
- REAR BRAKE ADJUSTMENT 63
- BRAKE FLUID LEVEL INSPECTION 65
- BRAKE LIGHT SWITCH ADJUSTMENT 66
- AIR BLEEDING 67
- AIR BLEEDING/ 68
- DRIVE CHAIN SLACK ADJUSTMENT 68
- STEERING HEAD INSPECTION 70
- FRONT FORK INSPECTION/ 71
- TIRE INSPECTION 72
- WHEEL INSPECTION 74
- BATTERY INSPECTION 75
- FUSE INSPECTION/ 78
- HEADLIGHT BEAM ADJUSTMENT 78
- CHAPTER 4 79
- ENGINE OVERHAUL 79
- ENGINE REMOVAL 82
- CYLINDER HEAD 84
- CAM SHAFT AND ROCKER ARMS 90
- VALVES AND VALVE SPRINGS 94
- CYLINDER AND PISTON 100
- 45 Nm (4.5 mkg) 106
- 7 Nm (0.7 mkg) 106
- 8 Nm (0.8 mkg) 107
- 70 Nm (7.0 mkg) 107
- 12 Nm (1.2 mkg) 107
- 6 Nm (0.6 mkg) 107
- SR401061 109
- SR402181 109
- CAUTION: 112
- OIL PUMP 113
- BALANCER GEAR 117
- SHIFT SHAFT AND SEGMENT 120
- 3 Nm (0.3 mkg) 125
- 30 Nm (3.0 mkg) 126
- 50 Nm (5.0 mkg) 126
- YP401081 127
- SR402163 127
- CRANKCASE AND CRANK SHAFT 130
- CRANK CASE AND CRANKSHAFT 130
- SR****** 138
- CHAPTER 5 141
- CARBURETION 141
- CARBURETOR 144
- CHAPTER 6 149
- FRONT WHEEL AND BRAKE DISC 151
- FRONT BRAKE 158
- 40 Nm (4.0 mkg) 170
- 65 Nm (6.5 mkg) 170
- 20 Nm (2.0 mkg) 170
- 9 Nm (0.9 mkg) 173
- 10 Nm (1.0 mkg) 174
- SR701020 175
- SR701021 175
- FRONT FORK 179
- HANDLEBAR 185
- STEERING 189
- CHAPTER 7 195
- ELECTRICAL 195
- SWITCH INSPECTION 198
- IGNITION SYSTEM 200
- ELECTRIC STARTING SYSTEM 206
- ELECTRICAL STARTING SYSTEM 207
- CHARGING SYSTEM 215
- LIGHTING SYSTEM 219
- SIGNAL SYSTEM 224
- CHAPTER 8 233
- TROUBLE SHOOTING 233
- TROUBLESHOOTING 235
- POOR IDLE SPEED PERFORMANCE 236
- POOR SPEED PERFORMANCE 237
- CLUTCH SLIPPING/DRAGGING 238
- FAULTY GEAR SHIFTING 238
- OVER HEATING/FAULTY BRAKE 239
- OVER HEATING OR OVER-COOL 239
- FAULTY BRAKE 239
- FRONT FORK MALFUNCTION 240
- INSTABLE HANDLING 240
- SR125 ’97 WIRING DIAGRAM 243
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