Honda NB50M - General Information; General Safety

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Contents1
General Information2
General Safety2
Service Rules2
Model Identification3
Vehicle Identification Number3
Carburetor Identification Number3
Engine Serial Number3
Specifications4
Torque Values6
Cable & Harness Routing8
Lubrication13
Service Information13
Troubleshooting13
Overheating13
Oil Pump Diagram14
Oil Pump Removal15
Oil Pump Inspection16
Oil Pump Installation16
Oil Pump Bleeding17
Oil Inlet Line/Oil Pump17
Oil Outlet Line17
Lubrication Points18
Maintenance19
Spark Plug19
Maintenance Schedule20
Battery21
Air Cleaner21
Fuel Line/Fuel Strainer Cleaning22
Oil Strainer23
Final Reduction Oil24
Oil Level Inspection24
Oil Change24
Recommended Spark Plugs24
Compression Test25
Ignition Timing25
Carburetor Adjustment25
Oil Pump Control Cable26
Idle Speed Adjustment26
Brakes27
Brake Shoe Inspection27
Suspension28
Steering Head Bearings28
Front28
Rear28
Wheels/Tires29
Nuts, Bolts, Fasteners29
Fuel System30
Fuel System Service Information31
Fuel System Troubleshooting31
Engine Cranks but Won't Start31
Lean Mixture31
Throttle Valve Disassembly32
Carburetor Removal34
Auto Bystarter35
Float/Float Valve/Jets Disassembly36
Jets, Float Valve, Float Assembly37
Float Level Inspection38
Carburetor Installation38
Throttle Valve Installation39
Reed Valve40
Reed Valve Removal40
Reed Valve Inspection40
Reed Valve Installation40
Fuel Auto Valve Inspection/Maintenance41
Engine Removal/Installation42
Cylinder Head,Cylinder,Piston47
Cylinder/Piston51
Cylinder Head Inspection51
Cylinder Head Decarbonizing51
Piston Removal52
Piston Ring/Expander Removal52
Cylinder/Piston Inspection52
Piston Ring Inspection54
Connecting Rod Inspection54
Piston/Cylinder Installation54
Alternator58
Alternator Service Information59
Alternator Removal60
Alternator Installation62
Drive and Drive Pulleys/Kick Starter/Clutch65
Engine Starts, but Scooter Won't Move66
Engine Stalls or Scooter Starts Suddenly66
Clutch Noise or Smell66
Drive Pulley67
Left Crankcase Cover Removal67
Drive Belt Removal67
Drive Belt Inspection67
Movable Drive Face Removal/Disassembly68
Movable Drive Face Inspection69
Movable Drive Face Assembly70
Movable Drive Face Installation71
Kick Starter Removal72
Clutch Removal77
Driven Face Disassembly78
Clutch/Driven Face Inspection80
Driven Face Assembly82
Driven Pulley Assembly82
Clutch/Driven Pulley Installation83
Final Reduction Service Information85
Final Reduction Troubleshooting85
Final Reduction Specifications85
Final Reduction Tools85
Final Reduction Disassembly86
Final Reduction Inspection87
Final Reduction Installation88
Transmission Cover Assembly88
Crankcase/Crankshaft90
Crankcase/Crankshaft Service Information91
Crankcase/Crankshaft Troubleshooting91
Crankcase/Crankshaft Specifications91
Crankcase/Crankshaft Tools91
Crankcase Separation92
Crankshaft Removal92
Crankshaft Insepction93
Steering/Front Wheel/Brake/Suspension96
Steering/Front Wheel/Brake/Suspension Service Information97
Steering/Front Wheel/Brake/Suspension Specifications97
Steering/Front Wheel/Brake/Suspension Tools97
Steering/Front Wheel/Brake/Suspension Troubleshooting98
Hard Steering98
Steers to One Side or Does Not Track Straight98
Front Wheel Wobbling98
Headlight Removal99
Instruments100
Headlight Disassembly100
Headlight Assembly/Installation100
Headlight Beam Adjustment100
Handlebar Remoavl104
Handlebar Installation105
Front Wheel Removal107
Front Wheel Disassembly107
Front Wheel Tools107
Axle Shaft108
Wheel Bearing108
Wheel Rim108
Front Brake Drum109
Front Brake111
Brake Lining Inspection111
Brake Panel Disassembly111
Front Fork112
Brake Panel Assembly112
Pivot Arm Removal112
Pivot Arm Bushing Inspection113
Front Shock Removal113
Front Shock Disassembly114
Front Shock Inspection114
Front Fork Spring Inspection115
Front Shock Assembly115
Steering Stem Removal116
Ball Race Disassembly/Assembly117
Steering Stem Installation118
Rear Wheel/Brake/Suspension120
Rear Wheel/Brake/Suspension Service Information121
Rear Wheel/Brake/Suspension Specifications121
Rear Wheel/Brake/Suspension Troubleshooting121
Rear Wheel/Brake/Suspension Tools121
Rear Wheel Removal122
Rear Wheel Inspection122
Wheel Rim Runout122
Brake Drum122
Rear Brake123
Rear Brake Lining Thickness Inspection123
Rear Brake Disassembly123
Rear Brake Assembly124
Rear Shock Absorber125
Rear Shock Absorber Spring Free Length126
Fuel Tank/Oil Tank128
Fuel Tank/Oil Tank Service Information129
Fuel Tank/Oil Tank Troubleshooting129
Engine Fails to Start129
Mixture too Lean129
Fuel Tank Removal130
Fuel Tank Disassembly131
Fuel Tank Assembly131
Oil Tank Removal132
Electrical Equipment135
No Power136
Low Power136
Intermittent Power136
Charging System Failure136
Battery Removal137
Battery Specific Gravity Test137
Battery Charging138
Charging System139
Charging Circuit139
Performance Test139
Technical Data139
Stator Coil Inspection140
Regulator/Rectifier140
Ignition System141
Resistor141
Ignition Circuit141
Ignition Coil141
Alternator Inspection142
Continuity Test142
CDI Unit143
Starter Motor144
Starter Circuit144
Starter Relay Removal144
Starter Relay Inspection144
Starter Motor Removal145
Starter Motor Disassembly146
Brush Inspection146
Commutator Inspection146
Starter Motor Assembly147
Starter Motor Installation147
Switches/Horn148
Ignition Switch148
Dimmer Switch148
Turn Signal Switch148
Front/Rear Stoplight Switch149
Oil Level Sensor150
Fuel Level Sensor151
Fuel Level Sensor Removal/Installation151
Unit Inspection151
Fuel Gauge Inspection151
Wiring Diagram153
Technical Features154
Auto-Bystarter154
Engine Does Not Start or Is Hard to Start156
Engine Lacks Power157
Poor Performance at Low and Idle Speeds158
Poor Performance at High Speed158
Clutch and Drive/Driven Pulleys159
Poor Handling159
Loss of Control159
Poor Front/Rear Suspension Performance159
Oil Indicator160
Poor Brake Performance160
Fuel Gauge161
Pointer Does Not Register Correctly161
Pointer Fluctuates or Swings Violently161
Starter Motor Does Not Turn162
Starter Motor Turns Sluggishly or Fails to Crank Engnie162
Engine Tools163
Chassis Tools164
Conveniency Tools164
General Specifications169
Standards and Service Limits171

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