Yamaha QT50 QT 50 1979-1992 Service Repair Workshop Manual

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The QT50, also known as the QT 50, is a lightweight scooter produced from 1979 to 1992. Renowned for its compact and user-friendly design, it features an automatic Continuously Variable...

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类型: Motorcycle

斯库: 57960

标签: 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 Motorcycle Motorcycles QT50 QT50 MA50 Yamaha

产品多属性

Description

The QT50, also known as the QT 50, is a lightweight scooter produced from 1979 to 1992. Renowned for its compact and user-friendly design, it features an automatic Continuously Variable Transmission (CVT) and a fuel-efficient two-stroke engine, making it a popular choice for urban commuting and recreational use. Its iconic styling for the era, combined with a reputation for engineering quality and reliability, cemented its place in the market alongside competitors like Honda and Suzuki. The QT50 offered a practical and enjoyable riding experience, characterized by its ease of operation and straightforward maintenance. This Service Repair Workshop Manual provides comprehensive guidance for the QT50 across its production years. It covers all essential aspects of the vehicle, including detailed procedures for engine disassembly, assembly, tuning, and troubleshooting, as well as maintenance and repair for the transmission, chassis, brakes, and electrical systems. The manual includes in-depth information on routine maintenance, component overhauls, and diagnostic procedures for common issues, along with essential wiring diagrams. This resource is designed to assist owners, mechanics, and technicians in keeping their QT50 in optimal working condition through clear, step-by-step instructions and technical specifications.

🏷️ Basic Information

Identification

Make:

Yamaha

Model:

Common Name:

Yamaha QT50 QT 50

Generation

Production Years:

1979-1992

Codes

Chassis Code:

👋 Introduction

Market Position

Segment:

Lightweight scooter, popular for urban commuting and recreational use.

Competitive Analysis

Competitors:

Competed against other 50cc scooters from manufacturers like Honda (e.g., Spree, Aero), Suzuki (e.g., FZ50), and Tomos.

Key Features

Features:

Compact and lightweight design, automatic transmission, fuel-efficient two-stroke engine, easy to operate and maintain, iconic styling for its era.

📋 Manual Details

Coverage Areas

Applicable Years:

1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992

Page Count

Estimated Pages:

Refer to actual manual for exact count, typically 300-500 pages for comprehensive service manuals.

Manual Type

Type:

Service Repair Workshop Manual

Language

Language:

English

Format

Format:

PDF Download

📖 Manual Coverage

Systems Covered

Engine:

Engine disassembly, assembly, tuning, troubleshooting, lubrication, cooling system, fuel system, ignition system, exhaust system.

Transmission:

Automatic transmission (CVT), clutch, gearbox, drive system maintenance and repair.

Chassis:

Frame, suspension (front and rear), steering system, wheels, tires.

Brakes:

Brake system diagnosis, maintenance, and repair for front and rear brakes.

Electrical:

Wiring diagrams, lighting system, charging system, ignition system, starter, battery, fuses, switches, controls.

Bodywork:

Body panels, seats, handlebars, controls, external trim, fasteners.

Procedures Included

Maintenance:

Routine maintenance checks, oil changes, filter replacements, spark plug servicing, chain adjustment, brake bleeding.

Troubleshooting:

Diagnostic procedures for common problems, electrical troubleshooting charts, engine performance issues.

Repair:

Detailed step-by-step repair procedures for all major components and systems.

Overhaul:

Complete engine and transmission overhaul procedures.

Wiring Diagrams:

Comprehensive electrical system wiring diagrams with component identification.

Technical Depth

Depth:

Comprehensive coverage from basic maintenance to complete engine rebuilds and advanced diagnostics.

📊 Manual Specifications

File Format

Quality:

High-resolution, searchable PDF. Printable pages.

Print Quality

Quality:

Digital format optimized for screen viewing and printing.

Binding Type

Type:

N/A (Digital PDF download)

Paper Type

Type:

N/A (Digital PDF download)

⚙️ Engine Specifications

Primary Engine

Type:

Two-stroke, air-cooled, single-cylinder

Displacement:

49cc (approximately 3.0 cubic inches)

Bore X Stroke:

Specifics found in manual, typically around 39mm x 41.4mm

Compression Ratio:

Specifics found in manual, likely around 7.0:1

Performance

Horsepower:

Typically in the 4-6 hp range

Torque:

Specifics found in manual

Fuel System

Carburetor:

Mikuni VM10 (common, specific model may vary)

Fuel Type:

Unleaded gasoline mixed with two-stroke oil (premix or oil injection system)

Lubrication

System:

Automatic oil injection or pre-mix

🔧 Transmission

Standard

Type:

Automatic Continuously Variable Transmission (CVT)

Optional

Type:

Features

Drive Type:

Belt drive to rear wheel

Fluid Type:

Yamaha recommends specific gearbox oil; details in manual.

📐 Dimensions

Exterior

Length:

Refer to manual for precise measurements.

Width:

Refer to manual for precise measurements.

Height:

Refer to manual for precise measurements.

Weights

Dry Weight:

Approximately 70-75 kg (154-165 lbs)

Gross Vehicle Weight Rating:

Refer to manual for specific rating.

Payload Capacity:

Refer to manual for specific capacity.

🛡️ Safety Features

Ratings

Crash Test Results:

N/A (Scooters typically not subjected to automotive-style crash testing)

Active Features

Braking:

Drum brakes front and rear.

Lighting:

Headlight, tail light, brake light, turn signals.

Passive Features

Body Construction:

Steel frame with plastic body panels.

💡 Technology Features

Infotainment

Features:

N/A (Basic scooter with minimal electronic features)

Driver Assistance

Features:

Connectivity

Features:

🔧 Maintenance

Service Intervals

Oil Change:

Refer to manual; typically every 1,000-2,000 km (600-1,200 miles) for gearbox oil.

Spark Plug:

Refer to manual; typically replaced every 3,000-5,000 km (2,000-3,000 miles) or as needed.

Air Filter:

Refer to manual; inspect and clean/replace periodically (e.g., every 1,000-2,000 km).

Belt Inspection:

Refer to manual; inspect CVT belt for wear and damage at regular intervals.

Fluid Specifications

Gearbox Oil:

Yamaha recommends specific gear oil (e.g., Yamalube Gear Oil). Refer to manual for exact grade and capacity (typically small quantity).

Two Stroke Oil:

High-quality two-stroke oil suitable for air-cooled engines.

Fuel Octane Rating:

Refer to manual, typically 87 or 89 octane unleaded gasoline.

Known Issues

Carburetor:

Clogging due to fuel residue, requires cleaning and proper jetting.

Electrical:

Corrosion in connectors, aging wiring harnesses, weak charging systems on older units.

Engine Seals:

Leaking crankcase seals or transmission seals can lead to oil consumption or leaks.

Cvt Belt:

Wear and tear on the CVT belt and clutch shoes, requiring periodic replacement.

📚 Vehicle History

Brand Heritage

Legacy:

Yamaha is renowned for its performance motorcycles, musical instruments, and marine products. The QT50 represents their entry into the lightweight scooter market.

Model Evolution

Development:

The QT50 was part of a wave of Japanese-designed scooters in the late 70s and early 80s, aimed at providing affordable and convenient personal transportation.

Production

Manufacturing Location:

Likely manufactured in Japan or by Yamaha's international partners.

Sales Trend:

Popularity peaked during its production run, with many units still in use or sought after by collectors and enthusiasts.

🏆 Awards & Recognition

Recognitions

Awards:

No specific widely publicized awards for this model, but recognized for its reliability and iconic status within its class.