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Yamaha YJ50RN User Manual

Yamaha YJ50RN
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YJ50RN
SERVICE MANUAL
LIT-11616-14-50 5LY-28197-E0

Table of Contents

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Yamaha YJ50RN Specifications

General IconGeneral
Displacement49cc
Front SuspensionTelescopic fork
Rear SuspensionUnit swing
Rear BrakeDrum
Fuel SystemCarburetor
TransmissionAutomatic
Starter SystemElectric and kick
Front Tire90/90-10
Rear Tire90/90-10

Summary

How to Use This Manual

Scooter Identification

Details on locating and recording vehicle identification numbers and model codes.

Important Manual Information

Crucial guidelines for preparation, parts replacement, and handling of components during service.

Special Tools

List and illustrations of specialized tools necessary for accurate maintenance and assembly.

Specifications

General Specifications

Overall dimensions, weight, and other general vehicle data.

Engine Specifications

Detailed technical parameters for the engine system, including displacement and bore.

Chassis Specifications

Technical details for the scooter's frame, wheels, brakes, and suspension.

Electrical Specifications

Technical data for electrical system components like battery, ignition, and lighting.

General Tightening Torque Specifications

Specifies tightening torques for standard fasteners and components.

Periodic Checks and Adjustments

Periodic Maintenance and Lubrication Intervals

Recommended service schedule and lubrication points for the scooter's longevity.

Side Covers and Footrest Board

Procedures for removing and installing side panels and footrests.

Front Panel and Leg Shield

Instructions for removing and installing the front body panels.

Adjusting the Engine Idling Speed

Step-by-step guide for setting the correct engine idle speed.

Checking the Spark Plug

Procedure for inspecting and verifying the spark plug's condition and gap.

Measuring the Compression Pressure

Method for checking engine compression to diagnose performance issues.

Replacing the Transmission Oil

Steps for draining and refilling the transmission oil.

Checking the Fuel and Vacuum Hoses

Procedure to inspect fuel and vacuum lines for damage or leaks.

Checking and Adjusting the Steering Head

Method for checking and adjusting steering head bearing tightness.

Checking the Tires

Instructions for checking tire pressure, tread depth, and condition.

Checking and Charging the Battery

Steps for inspecting, testing, and charging the vehicle's battery.

Checking the Fuse

Procedure for inspecting and replacing blown fuses to troubleshoot electrical issues.

Adjusting the Headlight Beam

Instructions for adjusting headlight aim for optimal visibility and safety.

Chassis

Front Wheel and Brake

Procedures for removing, checking, and installing the front wheel and brake system.

Rear Wheel and Brake

Steps for servicing the rear wheel and its associated brake system.

Handlebar

Instructions for removing, checking, and installing the handlebar and grips.

Steering Head

Procedures for checking and adjusting the steering head for proper operation.

Rear Shock Absorber Assembly

Steps for removing, checking, and installing the rear suspension component.

Engine

Engine Removal

Detailed steps and diagrams for removing the engine from the scooter.

Cylinder Head, Cylinder and Piston

Procedures for disassembling, checking, and assembling these core engine parts.

Kickstarter

Steps for removing, checking, and installing the kickstarter mechanism.

Belt Drive

Procedures for servicing the V-belt, pulleys, and related components.

Transmission

Procedures for removing, checking, and installing the transmission assembly.

Crankcase

Procedures for separating, checking, and assembling the crankcase halves.

Crankshaft

Steps for removing, checking, and installing the engine's crankshaft.

Carburetion

Carburetor

Procedures for removing, disassembling, checking, and installing the carburetor.

Measuring and Adjusting the Float Height

Method for setting the float height in the carburetor for correct fuel level.

Checking the Autochoke Assembly

Procedure for testing the automatic choke system for proper operation.

Electrical

Electrical Components

Overview diagram of major electrical system parts and their locations.

Switches

Procedures for checking switch continuity and overall function.

Ignition System

Circuit diagram and troubleshooting guide for the ignition system.

Electric Starting System

Circuit diagram and troubleshooting steps for the electric start mechanism.

Charging System

Circuit diagram and troubleshooting for the battery charging system.

Lighting System

Circuit diagrams and troubleshooting for headlights, taillights, and indicators.

Signaling System

Circuit diagrams and troubleshooting for turn signals, horn, and hazard lights.

Auto Choke System

Circuit diagram and troubleshooting steps for the automatic choke.

Troubleshooting

Starting Failure/Hard Starting

A guide to diagnosing and resolving issues related to engine starting problems.

Incorrect Engine Idling Speed/Poor Performance

Troubleshooting common engine performance issues like rough idle or poor acceleration.

Faulty Clutch

Diagnosing and resolving problems related to the clutch system's operation.

Overheating/Poor Braking/Unstable Handling

Troubleshooting guides for common issues like engine overheating, poor braking, and unstable handling.

Faulty Lighting or Signaling System

Common causes and solutions for lighting and signaling system malfunctions.

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