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125 AS3
Yamaha 125 AS3 User Manual
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2
Table of Contents
Contents
5
General Information
7
Vehicle View
9
Specifications and Performance
10
Engine Performance Curve
12
Driving Performance Curve
12
Tools and Instruments Required for Servicing
13
Yamaha Autolube System - Automatic Separate Lubrication System
15
Periodic Inspection
16
Inspection and Adjustment of Autolube Pump
17
Bleeding
17
Method of Setting of Carburetor and Pump
17
Inspection of Pump's Minimum Stroke
19
Adjustment of Brakes
20
Adjustment of Rear Brake
21
Adjustment of Clutch
22
Adjustment of Carburetor
23
Adjustment of Idling Speed
23
Disassembly and Cleaning of Carburetor
23
Change of Transmission Oil
24
Inspection of Spark Plug
25
Cleaning the Air Cleaner
26
Cleaning of Cylinder and Piston
27
Change of Front Fork Oil
28
Adjustment of Ignition Timing
29
Cleaning of Fuel Strainer
31
Lubrication to Drive Chain
31
Adjustment of Driving Chain Tension
31
Retightening of Bolts and Nuts
32
5-Port Cylinder
33
Engine
35
Precautions for Engine Disassembly
35
Engine Dismounting Procedure
35
Cylinder Head Disassembly
40
Cylinder Head Inspection
40
Cylinder Head Reassembly
40
Cylinder Correcting Procedure
41
Removal of Piston Pins and Pistons
42
Piston Pins and Pistons Inspection
43
Reinstallation of Piston Rings
45
Crankcase Cover Removal
46
Installation of Piston
46
Crankcase Cover Installation
47
Clutch
48
Power Train
49
Clutch Disassembly
50
Clutch Inspection
50
Inspection of Friction Plates
51
Inspection of Clutch Housing and Spacer
51
Inspection of Spacer and Main Axle
51
Clutch Installation
52
Inspection for Deflection of Clutch Plates
52
Inspection of Push Rod
52
Installation of Cushion Ring
53
Primary Drive Gear Removal
54
Primary Drive Gear Inspection
54
Kick Starter Mechanism
55
Kick Starter Removal
57
Kick Starter Installation
57
Drive Sprocket Removal
58
Drive Sprocket Inspection
59
Drive Sprocket Installation
59
Shifting Mechanism
60
Removal of Gear Shift Arm Shaft
61
Shifting Mechanism Inspection
61
Crankcase Removal
62
Shifting Mechanism Adjustment
62
Crankcase Installation
63
Transmission Ass'y
64
Transmission Gears Layout
64
Transmission Ass'y Removal
65
Crankshaft
66
Transmission Ass'y Installation
66
Crankshaft Removal
67
Crankshaft Inspection
67
Crankshaft Installation
68
Bearings and Oil Seals
69
Bearings and Oil Seals Removal and Installation
70
Carburetor View and Parts Identification
71
Checking the Carburetor
72
Cleaning the Carburetor
72
Adjusting the Fuel Level
73
Synchronizing Carburetors
73
Adjusting the Idle Speed
74
Carburetor Setting Values
74
Air Cleaner Removal
75
Air Cleaner Cleaning
75
Chassis
76
Front Wheel
76
Front Wheel Removal
77
Front Wheel Inspection
78
Rear Wheel View
79
Rear Wheel Removal
80
Rear Wheel Inspection
81
Replacing Tires
82
Rear Sprocket Wheel Removal
82
Suspension and Adjustment
83
Rear Arm Inspection
84
Fuel Tank Removal
84
Front Fork Removal
85
Disassembly of Outer and Inner Tubes
85
Front Fork Inspection
86
Front Fork Reassembly
86
Front Fork Installation to Frame
86
Rear Cushion Check for Oil Leakage
87
Electrical Equipment
88
AC Generator Performance Curve
88
Specification of AC Generator
89
Inspection of AC Generator
90
Ignition Coil
91
Ignition Coil Inspection
92
Silicon Rectifier
93
Easy Measurement of Silicon Rectifier
93
Battery
95
Other Electrical Equipment Information
95
Precautions for Handling Electrical Equipment
95
Inspection of Battery Electrolyte
95
Handling of Silicon Rectifier
96
Circuit Diagram
99
4
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Yamaha 125 AS3 Specifications
General
Maximum Power
15 hp @ 7, 500 rpm
Transmission
5-speed
Front Suspension
Telescopic fork
Rear Suspension
Swingarm
Front Brake
Drum
Rear Brake
Drum
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