Name: Yamaha DT125B 1974
Brand: Yamaha
Rating: 5 (1 reviews)

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Section Index4
General Information6
Machine Identification8
Starting Serial Numbers8
External View9
Specifications10
Special Tools and Gauges19
Point Checker19
Pocket Tester19
Electro Tester19
Periodic Inspections and Adjustments22
Tools24
Maintenance Interval Charts24
Periodic Maintenance25
Lubrication Intervals25
Recommended Lubricant Type25
Engine27
Carburetor27
Air Cleaner27
Autolube Pump28
Pump Stroke Adjustment29
Engine and Transmission Oil30
Clutch31
Chassis32
Cylinder Head32
Fuel Petcock32
Front Brake and Wheel32
Rear Brake and Wheel33
Drive Chain33
Drive Chain Maintenance34
Front Fork Oil Change34
Suspension, Steering and Swing Arm35
Electrical36
Contact Breaker Points36
Ignition Timing36
Spark Plug39
Battery39
Headlight40
Replacing the Headlight Bulb40
Engine Overhaul42
Removal44
Fuel Tank Assembly44
Wiring and Cables45
Change Pedal46
Flywheel Magneto46
Reed Valve Assembly47
Kick Crank47
Piston Pin and Piston47
Clutch Assembly and Primary Drive Gear47
Primary Drive49
Kick Axle Assembly50
Change Shaft Assembly50
Clutch Push Lever Axle51
Shift Cam Stopper51
Crankcase52
Transmission52
Inspection and Repairing53
Crankshaft53
Cylinder53
Piston Pin and Bearing54
Piston54
Piston Rings55
Kick Starter Assembly76
Mounting80
Crankcase Cover, Right80
Carburetion82
Hard Starting91
Poor Performance at Low Speed Operation91
Poor Acceleration91
Float Level92
Front Wheel Removal98
Front Axle98
Checking Brake Shoe Wear98
Brake Drum99
Checking Speedometer Gear99
Replacing Wheel Bearings100
Installing Front Wheel100
Rear Wheel101
Installing Rear Wheel101
DT100C Rear Wheel102
DT125C, DT175C Rear Wheel103
Rims and Spokes104
Tires and Tubes104
Checking the Loose Spokes104
Checking Rim "Run-Out"104
Drive Chain and Sprockets105
Chain Inspection106
Chain Maintenance106
Front Forks Disassembly107
Front Forks Inspection108
Front Forks Assembly109
DT100C/175C Front Fork110
Steering Head Adjustment111
Steering Head Disassembly111
Steering Head Inspection112
Steering Head Installation112
Swing Arm Inspection113
Rear Shock Absorber Removal114
Rear Shock Absorber Inspection114
Swing Arm Lubrication114
Swing Arm Removal114
Thermal Phase Shocks Operation115
Thermal Phase Shocks Inspection115
Shock Absorber Oil Change115
DT100C Rear Arm117
DT125C Rear Arm118
DT175C Rear Arm119
Cable and Fittings120
Cable Maintenance120
DTC175C Handle, Wire120
DT125C Handle, Wire121
Throttle Maintenance122
Cable Junction Maintenance122
Miscellaneous Chassis Components123
Fuel Tank123
Oil Tank124
Stand/Footrest/Brake Pedal125
Electrical System for DT100C, DT175C128
Connection Diagram131
Ignition System134
Spark Gap Test134
Ignition Coil Test134
Coil Winding Resistance Tests135
Condenser Test135
Capacity Test135
DT100C Flywheel Magneto136
DT175C Flywheel Magneto137
Charging System138
Charging Output Test138
Checking Silicon Rectifier141
A.C. Voltage Regulator142
Lighting and Signal Systems143
Service Life143
Lighting Tests and Checks - A.C. Circuit144
A.C. Circuit Output Test144
Lighting Coil Resistance Check144
Lighting Tests and Checks - D.C. Circuit145
Flasher Relay and Horn145
DT100C Electrical Components146
DT175C Electrical Components147
How to Read Spark Plug148
Spark Plug Inspection148
Switches149
Wire Color Abbreviations149
Electrical System for DT125C150
Starting and Charging System153
Ignition System Description153
Ignition Timing-Checking and Adjustment153
Ignition Coil153
Charging Mode154
Starting Mode154
Checking the Dynamo154
Checking Carbon Brushes155
Checking the Armature Assembly155
Checking the Commutator Mice Undercut156
Dynamo Adjustment Standards156
Measuring Charging Voltage157
Regulator (Voltage Regulator)157
Regulator Maintenance Standards159
Main Switch161
Engine Stop Switch161
Light Switch161
Flasher Switch161
Lighting System162
Light Bulbs and Horn162
Lighting Tests and Checks162
Horn Does Not Work162
High Beam Indicator Light Does Not Work163
Low Beam Does Not Work163
DT125C Electrical Components164
Appendices166
Troubleshooting Guide168
No Start or Difficult to Start168
Engine/Exhaust Systems168
Poor Idle And/Or Low Speed Performance169
Poor MID-Range and Poor High Speed Performance169
Conversion Tables170
Metric to Inch System170
Inch to Metric System171
Millimeters to Inches172
Inches to Millimeters172
Torque Specifications173
Standard Torque Setting173
Cable Routing Diagrams174
DT100C Cable Routing Diagram174
DT125C Cable Routing Diagram175
DT175C Cable Routing Diagram178

Brand	Yamaha
Model	DT125B 1974
Category	Motorcycle
Language	English

Yamaha DT125B 1974 User Manual

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Yamaha DT125B 1974 Specifications

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