Yamaha YJ125S Manuals

Manuals and User Guides for Yamaha YJ125S. We have 1 Yamaha YJ125S manual available for free PDF download: Service Manual

Yamaha YJ125S Service Manual

Yamaha YJ125S Service Manual (294 pages)

Brand: Yamaha | Category: Scooter | Size: 9.86 MB

Table of Contents

Table of Contents

6
- Service Manual
  1
- Specifications
  3
  - Periodic Checks and
    4
- Chassis
  5
- Electrical System
  5
- Engine
  5
- General Information
  5
- Periodic Checks and Adjustments
  5
- Specifications
  5
- Troubleshooting
  5
  - Table of Contents
    6
  - Gen Info
    7
- Chapter 1
  8
- Model Label
  8
- Scooter Identification
  8
- Vehicle Identification Number
  8
- Important Information
  9
- Checking the Connections
  11
- Special Tools
  13
Spec

15
- Chapter 2
  16
- General Specifications
  16
- Engine Specifications
  17
- Chassis Specifications
  26
- Electrical Specifications
  29
- Conversion Table
  33
- Convertion Table / General Tightening Torque Specifica- Tions
  33
- Tightening Torques
  34
  - Engine Tightening Torques
    34
  - Chassis Tightening Torques
    36
- Lubrication Points and Lubricant Types
  37
  - Engine Lubrication Points and Lubricant Types
    37
  - Chassis Lubrication Points and Lubrication Types
    39
- Oil Flow Diagrams
  40
- Cable Routing
  42
Chk Adj

46
Chas

104
- Front Wheel and Brake Disc
  106
- Chapter 4
  107
- Front Wheel
  107
- Removing the Front Wheel
  108
- Checking the Front Wheel
  109
- Checking the Brake Disc
  110
- Assembling the Front Wheel
  112
- Installing the Front Wheel
  113
- Adjusting the Front Wheel Static Balance
  114
- Rear Wheel and Rear Brake
  116
  - Checking the Rear Wheel
    117
  - Checking the Brake
    118
  - Assembling the Brake Shoe Plate
    119
  - Adjusting the Rear Wheel Static Balance
    119
- Front Brake
  120
- Front Fork
  138
  - Disassembing the Front Fork Legs
    139
  - Removing the Front Fork Legs
    140
  - Disassembling the Front Fork Legs
    141
  - Checking the Front Fork Legs
    143
  - Assembling the Front Fork Legs
    144
  - Installing the Front Fork Legs
    147
- Handlebar
  148
  - Removing the Handlebar
    149
  - Checking the Handlebar
    149
  - Installing the Handlebar
    150
- Steering Head
  152
  - Lower Fender Cover and Handlebar Lower Holder
    152
  - Lower Bracket
    153
  - Removing the Lower Bracket
    155
  - Checking the Steering Head
    156
  - Installing the Steering Head
    157
- Rear Shock Absorber
  158
Eng

160
- Chapter 5
  162
- Engine
  162
- Leads, Hoses and Rear Brake
  162
- Installing the Engine
  164
- Mainfold, Air Filter and Muffler Assembly
  165
- Cylinder Head
  166
  - Removing the Cylinder Head
    168
  - Checking the Cylinder Head
    170
  - Installing the Cylinder Head
    171
- The Rocker Arms and Camshaft
  174
- Valves and Valve Springs
  180
  - Removing the Valves
    181
  - Checking the Valves and Valve Guides
    182
  - Checking the Valve Seats
    184
  - Checking the Valve Springs
    186
  - Installing the Valves
    187
- Cylinder and Piston
  189
  - Removing the Cylinder and Piston
    190
  - Checking the Cylinder and Piston
    191
  - Checking the Piston Rings
    192
  - Checking the Piston Pin
    193
  - Checking the Timing Chain Guide
    194
  - Installing the Piston and Cylinder
    194
  - Crankcase Cover
    196
  - Kickstarter
    197
  - Installing the Kickstarter
    198
  - V-Belt, Clutch, Primary and Secondary Sheave
    199
  - Disassembling the Secondary Sheave
    200
  - Removing the Primary Sheave
    201
  - Removing the Secondary Sheave and V-Belt
    201
  - Disassembling the Secondary Sheave
    202
  - Checking the Clutch Shoe
    202
  - Checking the V-Belt
    203
  - Checking the Primary Sheave
    203
  - Checking the Primary Sheave Weights
    203
  - Checking the Slider
    204
  - Checking the Secondary Sheave
    204
  - Assembling the Primary Sheave
    204
  - Assembling the Secondary Sheave
    206
  - Installing the Belt Drive
    207
- Starter Clutch and Starter Motor
  209
  - Checking the Starter Wheel Gear
    210
- C.D.I. Magneto
  211
  - Removing the C.D.I. Magneto
    212
  - Installing the C.D.I. Magneto
    213
- Oil Pump
  214
  - Checking the Oil Pump
    215
  - Installing the Oil Pump
    216
- Transmission
  217
  - Checking the Transmission
    218
- Crankcase and Crankshaft
  219
Carb

226
- Carburetor
  229
- Chapter 6
  229
- Checking the Carburetor
  229
- Assembling the Carburetor
  231
- Installing the Carburetor
  232
- Measuring and Adjusting the Fuel Level
  233
- Checking the Autochoke Unit
  234
- Checking the Fuel Cock
  234
- Air Induction System
  236
  - Checking the Air Induction System
    237
Elec

238
- Chapter 7
  239
- Electrical Components
  239
- Wiring Diagram
  240
- Checking Switch Continuity
  242
- Checking the Switches
  243
- Checking the Bulbs and Bulb Sockets
  244
- Ignition System
  247
  - Circuit Diagram
    247
  - Troubleshooting
    248
- Electric Starting System
  252
  - Circuit Diagram
    252
  - Starting Circuit Cut-Off System Operation
    253
  - Troubleshooting
    254
  - Starter Motor
    254
  - Checking the Starter Motor
    259
  - Assembling the Starter Motor
    261
- Charging System
  262
  - Circuit Diagram
    262
  - Troubleshooting
    263
- Lighting System
  265
  - Circuit Diagram
    265
  - Troubleshooting
    266
  - Checking the Lighting System
    267
- Signaling System
  271
  - Circuit Diagram
    271
  - Troubleshooting
    272
  - Checking the Signaling System
    273
- Craburetor Heating System
  279
  - Circuit Diagram
    279
  - Troubleshooting
    280
- Auto Choke System
  283
  - Circuit Diagram
    283
  - Troubleshooting
    284
Trbl Shtg

286
- Chapter 8
  288
- Electrical Systems
  288
- Engine
  288
- Fuel System
  288
- Starting Failures
  288
- Incorrect Engine Idling Speed
  289
  - Engine
    289
  - Fuel System
    289
  - Electrical Systems
    289
- Starting Failures/Incorrect Engine Idling Speed
  289
- Faulty Clutch
  290
  - Engine Operates but Scooter will Not Move
    290
  - Clutch Slips
    290
  - Poor Starting Performance
    290
  - Fork Legs
    291
  - Poor Speed Performance
    291
- Poor Medium-And-High-Speed Performance
  290
  - Engine
    290
  - Fuel System
    290
- Poor Medium-And-High-Speed Performance/Faulty Clutch
  290
- Faulty Front Fork Legs
  291
  - Leaking Oil
    291
- Overheating
  291
  - Engine
    291
  - Fuel System
    291
  - Chassis
    291
  - Electrical Systems
    291
- Poor Braking Performance
  291

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