Yamaha YDS3 Manuals

Manuals and User Guides for Yamaha YDS3. We have 1 Yamaha YDS3 manual available for free PDF download: Service Manual

Yamaha YDS3 Service Manual (182 pages)

Brand: Yamaha | Category: Engine | Size: 53 MB

Disassembly
3
Inspection
4
Assembly
5
Engine Repair Procedure
7
Service Data
20
Mechanical Advantages of Yamaha Autolube
24
Sectional Views of Pumps
26
Pump Mechanism, General Mechanical Features
29
Main Parts and Their Function
30
Oil Passage
30
Check Ball and Check Ball Spring
30
Relationship between Plunger Stroke and Throttle Opening
31
Breather Bolt and Starter Plate
32
Distributor Plunger Mechanism
33
Suction Stroke
33
Delivery Stroke
33
Autolube Performance
35
Oil Control
35
Relationship of Plunger Stroke and Throttle Opening
35
Gasoline to Oil Ratios
36
Pump Setting
37
Inspection and Maintenance
37
Removing Air from the Pump
42
Disassembly and Assembly of Oil Pump
42
Oil Seal Insertion
42
Check Points after Mounting
43
Autolube of Characteristics
44
Troubleshooting
45
Pump Driving
47
Carburetion
49
Air Flow
51
Gas Flow
52
Mixture of Gas & Air
53
Adjustment
57
Air Leaks
57
Faulty Parts
57
Air Cleaner
57
Adjustment of the Cutaway on the Throttle Valve
58
Adjustment of Jet Needle
58
Adjustment of the Main Jet
58
Points of Importance When Adjusting
59
Choosing the Right Spark Plug
63
Various Aspects of Firing Ends of Spark Plugs
64
When Your Plug Is Fouled
64
When Your Plug Causes Overheating
65
Installation of Spark Plugs
66
How to Install a Plug
66
Adjustment of Spark Plug
66
Cleaning of Plugs
66
Spark Plug Comparison Chart
67
Conversion Formulas
70
Electrical Components
72
Principles & Tests
72
Generator
73
D.C. Dynamo with Self-Exciting Fields
73
Maintenance
73
Electrical Tester Use
74
Magneto
76
Principles of Ignition and Lighting Systems
76
Ignition
76
Ignition Coil
77
Primary Ignition Coil
78
Starter, Integral with Generator
78
Starter Coil
79
Regulator
79
Electrical Adjustment
81
Related Precautionary Measures
81
Cut-Out Relay
82
Adjusting Arm
82
Battery
87
Recharging the Battery
88
Maintenance of Battery
88
Operating Instructions
90
Connection of Power Source
91
Voltage of Power Source
91
Measurement of Resistance
92
Condenser Test
92
Overload Voltage Test
92
Measurement of Voltage Regulator Output
93
Condition of Contact Points with a Faulty Condenser
93
Measurement of Current
94
Continuity Test
94
Test of Ignition Coil
95
Timing Light
95
Starter Test
96
Rectifier Checker
98
How to Check the Rectifier
98
Voltage Drop Test
98
Table of Specifications - Battery
99
Mechanical Measuring Devices
104
Outside Micrometer
105
Example of the Reading
105
Inside Micrometer
106
Depth Micrometer
107
Vernier Caliper
108
Depth
109
How to Use the Dial Gauge
110
Cylinder Gauge Metric
111
How to Use the Cylinder Gauge
111
General Considerations for Tuning 2-Cycle Engines
122
Gas Pressure and Torque
124
Compression Ratio
124
Changing Port Timing
129
Tuning Exhaust Passages
130
Numerical Example
133
Exhaust Gas Pressure Diagram
134
Reducing Mechanical Loss
136
Reducing Oil Viscosity Loss
136
Gear Ratio Selection
139
Tuning Tips
142
Tuning the YG1 for Speed
146
Right Crankcase
150
Carburetor Cap and Cap Plate
151
Muffler
151
Secondary Reduction Sprocket Ratio Modification
151
Gear Change Arm
151
Front Fork Modification
152
Rear Suspension Unit Modification
152
Tire Modification
153
Other Modifications to Frame
153
Electric Equipment Modification
153
Special Service Data for Tuning
153
Cylinder Head
155
Modification of Standard Cylinder Head
155
Piston and Piston Rings
157
Rotary Valve
157
Valve Cover
158
Carburetor
158
Crankcase Right
159
Right Crankcase Cover
159
Carburetor Cover
159
Clutch Spring Modification
160
Secondary Reduction Sprocket Ratio
161
Gear Change Arm with Pedal
161
Left Crankcase Change
161
Kick Crank
161
Front Wheel Modification
162
Rear Wheel Modification
162
Front Fork
162
Rear Suspension Unit
162
Tuning the YJ1 for Speed
165
Piston
167
GYT Valve
167
MOD Valve
167
Carburetor Chamber Cover
170
Secondary Reduction Ratio
171

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