KEEWAY QJ50T-21U - User Manual

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Motorcycle QJ50T-21U
Maintenance Manual
Qianjiang Motor Corporation Ltd.

KEEWAY QJ50T-21U Specifications

General

Brand	KEEWAY
Model	QJ50T-21U
Category	Scooter
Language	English

Summary

Specification

Engine Specifications

Technical data for the motorcycle's engine.

Braking System Specifications

Technical data for the motorcycle's braking system.

Failure Diagnosis

Diagnosis on failure or difficulty in starting engine

Troubleshooting guide for engine starting issues.

Diagnosis on engine overheating

Diagnosis on power shortage of engine

Diagnosis on difficulty in transmission shift

Diagnosis on clutch slipping

Diagnosis on malfunction of hydraulic disc brake

Diagnosis on battery charging failure

Diagnosis on starter motor failure in rotation

Diagnosis on power shortage of battery

Engine Oil;Filter

Oil Level

Procedure for checking and maintaining engine oil level.

Spark Plug

Charging

Carburetor

Idle speed adjustment

Procedure for adjusting the engine's idle speed.

Ignition Timing

Cylinder Pressure

Inspection of Brake Fluid Level

Inspection and Maintenance of Electrical System

Charging System

I. Battery;Charging System

1.2 Failure diagnosis

1.3 Battery

1.3.2 Charging

Instructions for charging the motorcycle battery.

1.4 Charging System

1.4.1 Short-circuit Test

Procedure for testing the charging system for short circuits.

1.5 Voltage;Current Regulator

1.5.2 Voltage-current Regulator Check

Procedure for checking the voltage-current regulator.

1.6 Magnetor charging coil

Ignition System

II. Ignition System

2.2 Failure Diagnosis

2.3 Ignition System Check

2.3.1 Primary voltage of the ignition coil

Procedure for measuring primary voltage of the ignition coil.

2.4 CDI Group

2.4.1 Syetem Check

Procedure for checking the CDI group system.

2.5 Ignition Coil

2.5.2 Check the Primary Coil

Measuring impedance of the ignition coil's primary coil.

2.6 Trigger

Startup System

III. Startup System

3.2 Failure diagnosis

3.3 Startup Motor

3.3.3 Check

Procedures for checking startup motor components.

3.4 Starter Relay

3.4.1 Check

Procedure for checking the starter relay.

Front Disc Brake

Rear Drum Brake

5. Brake

5.2 Failure Diagnosis

Troubleshooting guide for brake system malfunctions.

5.3 Front Disc Brake

5.3.2 Check

Checking the front disc brake components for wear.

5.4 Rear Drum Brake

5.4.2 Check

Checking the rear drum brake components for wear.

Front Wheel

Front Suspension

7. Front Wheel; Front Suspension

7.2 Failure Diagnosis

Troubleshooting guide for front wheel/suspension issues.

7.2.1 Difficulty in Steering

Troubleshooting common steering difficulties.

7.3 Front Wheel

7.3.1 Disassembly

7.3.2 Check

7.5 Front Fork

7.5.1 Disassembly

Rear Wheel;Rear Suspension

Rear Wheel

8. Rear Wheel;Rear Suspension

8.2 Failure Diagnosis

8.3 Rear Wheel

8.3.2 Check

8.4 Rear Absorber

8.4.1 Disassembly

Disassembly and Installation of Engine

10. Removal and Installation of Motor

10.2 Failure Diagnosis

10.3 Disassembly of Motor

10.3.1 Disassembly

10.4 Installation

Inspection and Maintenance of Engine

11.Lubricaiting System

11.2 Failure Diagnosis

11.3 Fuel Pump

11.3.1 Disassembly

12. Carburetor

12.2 Failure Diagnosis

12.3 Carburetor Disassembly

12.4 Installation and Adjustment

Cylinder Cover

13. Cylinder Cover

13.2 Failure Diagnosis

13.3 Cylinder Cover

13.4 Cylinder Cover Check

Cylinder Block and Piston

14. Cylinder Block and Piston

14.2 Failure Diagnosis

14.4 Piston

14.4.1 Disassembly

14.5 Piston Installation

Drive Face;Clutch;Driven Wheel

15. Drive Face;Clutch;Driven Wheel;Kickstart Mechanism

15.2 Failure Diagnosis

15.4 Drive Face

15.4.1 Disassembly

15.5 Clutch;Driven Wheel

15.5.2 Breakdown of Clutch

15.6 Breakdown of Clutch and Driven Wheel

15.6.1 Replacement of the Bearing on the Right Half Driven Wheel

15.7 Installation

15.8 Kickstart Mechanism

16. Decelerator

16.2 Failure Diagnosis

16.4 Installation

Crankcase

17. Crankcase

17.2 Failure Diagnosis

17.3 Crankcase

17.3.1 Removal of Crankcase

17.4 Installation

18. Exhaust Emission & Control System

18.5 Measures when the idle speed emission value exceeds the standard (Two-Stroke)

Electricity Principle Diagram