Yamaha YDS3 - User Manual

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For private use only, created by Yamaparts.com

PARTS

Main Page

Disassembly3
Inspection4
Assembly5
Engine Repair Procedure7
Service Data20
Mechanical Advantages of Yamaha Autolube24
Sectional Views of Pumps26
Pump Mechanism, General Mechanical Features29
Main Parts and Their Function30
Oil Passage30
Check Ball and Check Ball Spring30
Relationship between Plunger Stroke and Throttle Opening31
Breather Bolt and Starter Plate32
Distributor Plunger Mechanism33
Suction Stroke33
Delivery Stroke33
Autolube Performance35
Oil Control35
Relationship of Plunger Stroke and Throttle Opening35
Gasoline to Oil Ratios36
Pump Setting37
Inspection and Maintenance37
Removing Air from the Pump42
Disassembly and Assembly of Oil Pump42
Oil Seal Insertion42
Check Points after Mounting43
Autolube of Characteristics44
Troubleshooting45
Pump Driving47
Carburetion49
Air Flow51
Gas Flow52
Mixture of Gas & Air53
Adjustment57
Air Leaks57
Faulty Parts57
Air Cleaner57
Adjustment of the Cutaway on the Throttle Valve58
Adjustment of Jet Needle58
Adjustment of the Main Jet58
Points of Importance When Adjusting59
Choosing the Right Spark Plug63
Various Aspects of Firing Ends of Spark Plugs64
When Your Plug Is Fouled64
When Your Plug Causes Overheating65
Installation of Spark Plugs66
How to Install a Plug66
Adjustment of Spark Plug66
Cleaning of Plugs66
Spark Plug Comparison Chart67
Conversion Formulas70
Electrical Components72
Principles & Tests72
Generator73
D.C. Dynamo with Self-Exciting Fields73
Maintenance73
Electrical Tester Use74
Magneto76
Principles of Ignition and Lighting Systems76
Ignition76
Ignition Coil77
Primary Ignition Coil78
Starter, Integral with Generator78
Starter Coil79
Regulator79
Electrical Adjustment81
Related Precautionary Measures81
Cut-Out Relay82
Adjusting Arm82
Battery87
Recharging the Battery88
Maintenance of Battery88
Operating Instructions90
Connection of Power Source91
Voltage of Power Source91
Measurement of Resistance92
Condenser Test92
Overload Voltage Test92
Measurement of Voltage Regulator Output93
Condition of Contact Points with a Faulty Condenser93
Measurement of Current94
Continuity Test94
Test of Ignition Coil95
Timing Light95
Starter Test96
Rectifier Checker98
How to Check the Rectifier98
Voltage Drop Test98
Table of Specifications - Battery99
Mechanical Measuring Devices104
Outside Micrometer105
Example of the Reading105
Inside Micrometer106
Depth Micrometer107
Vernier Caliper108
Depth109
How to Use the Dial Gauge110
Cylinder Gauge Metric111
How to Use the Cylinder Gauge111
General Considerations for Tuning 2-Cycle Engines122
Gas Pressure and Torque124
Compression Ratio124
Changing Port Timing129
Tuning Exhaust Passages130
Numerical Example133
Exhaust Gas Pressure Diagram134
Reducing Mechanical Loss136
Reducing Oil Viscosity Loss136
Gear Ratio Selection139
Tuning Tips142
Tuning the YG1 for Speed146
Right Crankcase150
Carburetor Cap and Cap Plate151
Muffler151
Secondary Reduction Sprocket Ratio Modification151
Gear Change Arm151
Front Fork Modification152
Rear Suspension Unit Modification152
Tire Modification153
Other Modifications to Frame153
Electric Equipment Modification153
Special Service Data for Tuning153
Cylinder Head155
Modification of Standard Cylinder Head155
Piston and Piston Rings157
Rotary Valve157
Valve Cover158
Carburetor158
Crankcase Right159
Right Crankcase Cover159
Carburetor Cover159
Clutch Spring Modification160
Secondary Reduction Sprocket Ratio161
Gear Change Arm with Pedal161
Left Crankcase Change161
Kick Crank161
Front Wheel Modification162
Rear Wheel Modification162
Front Fork162
Rear Suspension Unit162
Tuning the YJ1 for Speed165
Piston167
GYT Valve167
MOD Valve167
Carburetor Chamber Cover170
Secondary Reduction Ratio171

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Yamaha YDS3 Specifications

General

Brand	Yamaha
Model	YDS3
Category	Engine
Language	English

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