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Yamaha 125 AS3 User Manual

Yamaha 125 AS3
102 pages
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PARTS
For private use only, copyright Yamaparts.com

Table of Contents

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Yamaha 125 AS3 Specifications

General IconGeneral
Maximum Power15 hp @ 7, 500 rpm
Transmission5-speed
Front SuspensionTelescopic fork
Rear SuspensionSwingarm
Front BrakeDrum
Rear BrakeDrum

Summary

CHAPTER 1 GENERAL

Engine, Lubrication, and Transmission

Covers engine design, Autolube system, and transmission features.

Chassis, Brakes, and Suspension

Details the frame, styling, brakes, suspension, and front fork.

Performance and Specifications

Lists key specifications, performance data, and curves for the AS3.

Essential Servicing Tools

Identifies standard and special tools required for maintenance and repair.

CHAPTER 2 YAMAHA AUTOLUBE SYSTEM

Autolube System Explained

Explains the function, purpose, and benefits of the Yamaha Autolube system.

CHAPTER 3 PERIODIC INSPECTION

Inspection and Lubrication Schedule

Outlines lubrication points and periodic inspection tasks with intervals.

Key System Adjustments

Covers adjustments for autolube pump, brakes, clutch, and carburetor.

Fluid and Component Maintenance

Details transmission oil change, spark plug inspection, and air cleaner cleaning.

Engine and Drive Chain Maintenance

Covers cleaning cylinder/piston, front fork oil, ignition timing, and drive chain.

CHAPTER 4 5-PORT CYLINDER

5-Port Cylinder Design and Construction

Explains the design, construction, and features of the 5-port cylinder induction system.

CHAPTER 5 ENGINE

Engine Dismounting and Reassembly

Step-by-step guide for removing and reinstalling the engine.

Cylinder Head and Cylinder Service

Procedures for servicing the cylinder head and cylinder, including carbon removal.

Piston, Clutch, and Gear Service

Covers service for pistons, clutch assembly, and primary drive gear.

Kick Starter and Drive Sprocket

Details the kick starter mechanism and service for the drive sprocket.

CHAPTER 6 CHASSIS

Front and Rear Wheel Service

Procedures for servicing front and rear wheels, including inspection.

Sprocket, Arm, and Fuel Tank

Covers service for rear sprocket, rear arm, and fuel tank removal.

Front Fork and Rear Cushion Maintenance

Details front fork service and rear cushion inspection for oil leakage.

CHAPTER 7 ELECTRICAL EQUIPMENT

Electrical System Overview and Components

Outlines the electrical system and covers A.C. generator and ignition coil.

Rectifier, Battery, and Precautions

Details silicon rectifier, battery specifications, and electrical handling precautions.

125 AS3 Circuit Diagram

Detailed Wiring Diagram

Provides a comprehensive wiring diagram of the motorcycle's electrical system.

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