Yamaha QT50 QT 50 1979-1992 Workshop Repair Service Manual

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Tipo: Motorcycle

Proveedor:

SKU: 55149

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

Variantes de producto

Descripción

The QT50, produced from 1979 to 1992, represents a classic in the lightweight scooter and moped category. Engineered for simplicity, reliability, and fuel efficiency, this model was designed to offer accessible and convenient personal transportation, particularly for urban commuting and recreational riders. Its 49cc two-stroke, air-cooled engine, coupled with an automatic Continuously Variable Transmission (CVT), ensures smooth operation and ease of use. The QT50's design philosophy emphasizes maneuverability and low running costs, making it a popular choice against competitors of its era. This comprehensive workshop repair service manual in English provides detailed technical information essential for maintaining and repairing the QT50 across its production years. It covers all major systems, including the engine, transmission, chassis, brakes, and electrical components, offering step-by-step procedures for routine maintenance, troubleshooting common issues, and performing complete overhauls. The manual also includes crucial technical specifications, torque settings, fluid requirements, and wiring diagrams, making it an invaluable resource for both DIY enthusiasts and professional mechanics aiming to preserve the functionality and longevity of this iconic scooter.

🏷️ Basic Information

Identification

Make:

Yamaha

Model:

Model Variant:

QT 50

Codes

Model Code:

Generation

Production Years:

1979-1992

👋 Introduction

Market Position

Category:

Lightweight Scooter / Moped

Target Audience:

Commuters, recreational riders, vintage scooter enthusiasts.

Competitive Analysis

Competitors:

Honda Spree, Suzuki FA50, Tomos Revival, various other small-displacement mopeds and scooters of the era.

Key Features

Design Philosophy:

Simplicity, reliability, fuel efficiency, ease of operation and maintenance, urban maneuverability.

Manual Value Proposition:

Provides essential, detailed technical information to maintain, repair, and restore the Yamaha QT50, crucial for preserving its functionality and value.

📋 Manual Details

Coverage Areas

Covered Years:

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

Region Coverage:

Global (referencing typical Yamaha model specifications)

Page Count

Estimated Page Count:

Manual Type

Type:

Workshop Repair Service Manual

Language

Language:

English

Format

Format:

PDF Download

📖 Manual Coverage

Systems Covered

Engine:

Complete engine overhaul, diagnosis, tuning, lubrication system, cooling system, fuel system, ignition system, exhaust system.

Transmission:

Automatic transmission (CVT) disassembly, assembly, troubleshooting, fluid service, clutch operation.

Chassis:

Frame inspection and repair, front fork and suspension servicing, rear shock absorber replacement, steering system maintenance.

Brakes:

Front and rear brake system servicing, hydraulic system checks, pad replacement, drum adjustment (if applicable), bleeding procedures.

Electrical:

Wiring diagrams, lighting system, ignition system, charging system, battery maintenance, starter motor, troubleshooting electrical faults.

Bodywork:

Body panel removal and installation, seat servicing, handlebar replacement, fairing repair (if applicable), cosmetic maintenance.

Procedures Included

Maintenance:

Scheduled maintenance tasks, oil changes, filter replacements, spark plug service, chain adjustment, tire pressure checks, brake adjustments.

Troubleshooting:

Diagnostic procedures for common starting issues, engine performance problems, electrical faults, braking system anomalies, and transmission engagement.

Repair:

Step-by-step instructions for engine component replacement, carburetor overhaul, brake system overhauls, suspension rebuilds, and electrical component repair.

Specifications:

Detailed torque specifications, fluid capacities, wear limits, electrical resistance values, and measurement tolerances.

Technical Depth

Depth:

Comprehensive, covering routine maintenance to complete engine and component overhauls. Suitable for DIY enthusiasts and professional mechanics.

📊 Manual Specifications

File Format

File Type:

Searchability:

Typically text-searchable for quick information retrieval.

Print Quality

Resolution:

High-resolution scans of original factory documentation, ensuring clarity of text and diagrams.

Binding Type

Binding:

N/A (Digital Download)

Paper Type

Paper:

N/A (Digital Download)

⚙️ Engine Specifications

Primary Engine

Engine Type:

2-stroke, air-cooled, reed valve induction

Displacement:

Bore X Stroke:

39.0mm x 41.4mm (typical for this engine family)

Compression Ratio:

7.2:1 (typical)

Carburetor Model:

Mikuni VM16-1 (typical, refer to manual for specific variations)

Performance

Horsepower:

Approximately 3.5 - 4.0 HP @ 6000 RPM (estimate, actual may vary)

Torque:

Not typically published, but designed for low-end urban acceleration.

Fuel System

Fuel Type:

Unleaded gasoline mixed with 2-stroke oil (50:1 ratio common, check manual for precise specification)

Fuel Tank Capacity:

Approximately 3.5 Liters (0.92 US Gallons)

🔧 Transmission

Standard

Transmission Type:

Automatic (CVT - Continuously Variable Transmission)

Clutch Type:

Centrifugal automatic clutch

Final Drive:

Gear reduction

Features

Operation:

Seamless gear ratio changes for optimal engine performance and fuel economy.

📐 Dimensions

Exterior

Overall Length:

Approximately 1765 mm (69.5 inches)

Overall Width:

Approximately 680 mm (26.8 inches)

Overall Height:

Approximately 1055 mm (41.5 inches)

Wheelbase:

Approximately 1240 mm (48.8 inches)

Weights

Dry Weight:

Approximately 73 kg (161 lbs)

Gross Vehicle Weight Rating:

Refer to chassis plate, typically around 200 kg (440 lbs)

🛡️ Safety Features

Ratings

Crash Safety:

Not applicable in the context of automotive safety ratings. Mopeds generally lack the structural integrity and safety features of motorcycles or cars.

Active Features

Braking System:

Hydraulically operated front disc brake (on some models/years), rear drum brake. Essential for safe operation.

Lighting:

Headlight, taillight, brake light, turn signals (where equipped), ensuring visibility to others.

Passive Features

Frame Construction:

Steel tube frame providing basic structural support.

Tyre Specification:

Front: 3.00-10 4PR, Rear: 3.00-10 4PR (typical, check manual and tires for exact size)

💡 Technology Features

Infotainment

System:

Basic instrumentation: speedometer, odometer, indicator lights (turn signal, neutral, oil level/low oil).

Driver Assistance

Features:

None in the modern sense. Relies on rider attentiveness and proper maintenance.

Connectivity

Features:

🔧 Maintenance

Service Intervals

Engine Oil Change:

Every 1,000 km or 6 months. Refer to manual for exact specification and procedure.

Spark Plug Service:

Check at 1,000 km intervals, replace as needed based on condition.

Air Filter Cleaning:

Clean every 2,000 km or annually. Replace as needed.

Transmission Fluid Check:

Check level and condition periodically, replace as per manual's recommendation (often at major engine service).

Fluid Specifications

Engine Oil Type:

Yamaha 10W-30 API SE or SF classification (verify with manual for precise specification and viscosity).

Transmission Oil Type:

Refer to manual for specific gear oil type and capacity (typically a light gear oil).

Brake Fluid Type:

DOT 3 or DOT 4 hydraulic brake fluid (check caliper/reservoir for designation).

Fuel Mixture:

Unleaded gasoline mixed with 2-stroke oil at a 50:1 ratio (crucial for engine longevity).

Known Issues

Carburetor Gumming:

Common with 2-strokes if left unused; requires cleaning and rebuilding. Manual provides full procedure.

Cylinder Wear:

With age and mileage, bore wear can lead to compression loss. Manual details wear limits and re-boring procedures.

Electrical Connections:

Corrosion and loose connections can cause intermittent electrical issues. Manual's wiring diagrams are essential for diagnosis.

Cvt Belt Wear:

The CVT drive belt can wear over time, affecting acceleration. Manual specifies replacement intervals and procedures.

📚 Vehicle History

Brand Heritage

Manufacturer:

Yamaha Motor Corporation, a global leader in musical instruments and powersports vehicles known for innovation and quality.

Model Evolution

Design Period:

Designed for the economical and convenient personal transportation market of the late 1970s and 1980s.

Positioning:

Part of Yamaha's strategy to offer accessible and stylish mobility solutions.

Production

Production Location:

Likely manufactured in Japan or other Yamaha global facilities during its production run.

Market Impact:

Contributed to the popularity of lightweight, fuel-efficient scooters for urban commuting and recreational use.

🏆 Awards & Recognition

Recognitions

Market Reputation:

Considered a reliable and economical entry-level scooter during its production era.

Ratings

User Reviews:

Generally positive for ease of use and low running costs, though performance is modest.

Certifications

Emissions Standards:

Compliant with the emissions regulations of its respective production years. Manual may contain specific emissions control information.