Yamaha QT50 QT 50 1979-1992 Factory Service Repair Manual

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类型: Motorcycle

斯库: 51910

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

This manual provides comprehensive information for the QT50, often referred to as the "Scoot," a lightweight and utilitarian scooter produced during the late 1970s and early 1980s. Designed for urban commuting and light recreational use, the QT50 embodies a commitment to reliability, fuel efficiency, and user-friendly operation. Its simple mechanical design, powered by a 49cc two-stroke engine, made it a popular and accessible choice in its market segment, competing effectively with other entry-level scooters of its era. This factory service repair manual is an essential resource for maintaining and repairing your QT50 from the 1979 to 1982 model years. It covers an extensive range of topics, including detailed procedures for engine assembly and disassembly, transmission maintenance, electrical system diagnostics, chassis servicing, and bodywork. With hundreds of pages of factory-level detail, including troubleshooting guides, technical specifications, and clear wiring diagrams, this manual is indispensable for owners and technicians aiming to ensure the optimal performance and longevity of their vehicle.

🏷️ Basic Information

Identification

Make:

Yamaha

Model:

Nickname:

Yamaha Scoot

Codes

Manual Product Code:

Yamaha QT50 QT 50 1979-1992 Factory Service Repair Manual PDF Download

👋 Introduction

Market Position

Market Segment:

Lightweight, utilitarian scooter, popular for urban commuting and light recreational use in its era.

Competitive Analysis

Key Competitors:

Competed against other entry-level scooters from brands like Honda (e.g., Spree, Aero), Suzuki (e.g., FA50), and Tomos during the late 70s and 80s.

Key Features

Unique Selling Points:

Yamaha's reputation for reliability and performance, user-friendly operation, fuel efficiency, simple mechanical design.

Target Audience

Intended Users:

Owners of Yamaha QT50 scooters, independent repair shops, mechanics specializing in vintage Japanese motorcycles and scooters.

📋 Manual Details

Coverage Areas

Applicable Years:

1979, 1980, 1981, 1982

Specific Models Covered:

Yamaha QT50

Page Count

Page Count:

Hundreds of pages

Manual Type

Manual Type:

Factory Service Repair Manual

Language

Language:

English

Format

Format:

PDF Download

📖 Manual Coverage

Systems Covered

Engine Systems:

Engine assembly, disassembly, troubleshooting, tuning, carburetor, lubrication system, cooling system (if applicable for the model type), ignition system, fuel delivery.

Transmission Systems:

Automatic transmission (CVT), clutch operation, gearbox internals, troubleshooting.

Electrical Systems:

Wiring diagrams, lighting, ignition system components, charging system (stator, rectifier), battery, starter motor, fuses, switches.

Chassis Systems:

Frame, suspension (front fork, rear shock absorber), steering system, wheels, brakes (drum brake specifics), bearings.

Bodywork And Fittings:

Body panels, seat, handlebars, controls, fenders, minor trim.

Procedures Included

Maintenance Procedures:

Oil changes, filter replacements, spark plug replacement, chain/belt adjustments (if applicable), lubrication points, air filter cleaning/replacement, brake adjustment.

Repair Procedures:

Engine rebuild, carburetor overhaul, transmission repair, suspension component replacement, brake system servicing, electrical component diagnosis and replacement.

Troubleshooting Guides:

Diagnostic charts for common symptoms (e.g., starting issues, poor performance, electrical faults), step-by-step troubleshooting sequences.

Technical Specifications:

Torque specifications, clearances, gap settings, fluid capacities, electrical resistance values.

Diagnostic Procedures:

Includes systematic methods for diagnosing engine performance issues, electrical faults, and mechanical problems, often with flowcharts or symptom-based tables.

Assembly Disassembly:

Detailed step-by-step instructions for taking apart and reassembling the entire scooter, from engine components to body panels, with critical torque values and fastener specifications.

Technical Depth

Depth Of Coverage:

Comprehensive factory-level detail, suitable for professional mechanics and advanced DIY enthusiasts. Covers disassembly, inspection, repair, and reassembly of all major components.

Wiring Diagrams:

Detailed, often color-coded, electrical system diagrams that are essential for troubleshooting and repairing electrical issues.

Special Tools:

Lists any specialized tools recommended or required for specific repair procedures, which is crucial for proper execution and safety.

📊 Manual Specifications

File Format

File Format:

Print Quality

Print Quality:

High-resolution, suitable for printing individual pages or the entire manual. Clear diagrams and text.

Binding Type

Binding Type:

N/A (Digital Download - PDF)

Paper Type

Paper Type:

N/A (Digital Download - PDF)

⚙️ Engine Specifications

Primary Engine

Engine Type:

2-stroke, single-cylinder, air-cooled

Displacement:

Bore X Stroke:

39.0mm x 41.5mm (Typical for 49cc Yamaha engines of this era)

Compression Ratio:

Approx. 7.0:1 (Typical for this class)

Performance

Horsepower:

Approx. 3.5 - 4.0 HP @ 6000 RPM (Estimated based on similar models)

Torque:

Not typically specified in detail for this engine class, but sufficient for low-speed acceleration.

Fuel System

Carburetor Model:

Mikuni VM15SC (Commonly fitted, specific variant may vary slightly)

Fuel Type:

Unleaded gasoline

Fuel Mixture:

Pre-mix 2-stroke oil and gasoline at 50:1 ratio (or as specified in manual)

Ignition System

Ignition Type:

CDI (Capacitor Discharge Ignition)

Lubrication

Lubrication System:

Autolube (oil injection system)

Cooling

Cooling Method:

Forced air cooling

🔧 Transmission

Standard

Transmission Type:

Automatic (Twist-and-go CVT - Continuously Variable Transmission)

Features

Drive System:

V-belt drive

Clutch Type:

Centrifugal clutch

📐 Dimensions

Exterior

Overall Length:

Approx. 1640 mm (64.6 in)

Overall Width:

Approx. 655 mm (25.8 in)

Overall Height:

Approx. 990 mm (39.0 in)

Wheelbase:

Approx. 1150 mm (45.3 in)

Weights

Dry Weight:

Approx. 67 kg (148 lbs)

Gross Vehicle Weight Rating:

Not explicitly stated, but designed for rider + cargo.

Wheels And Tires

Front Tire Size:

3.00-10-4PR

Rear Tire Size:

3.00-10-4PR

Wheel Type:

Spoke wheels

🛡️ Safety Features

Ratings

Crash Test Ratings:

N/A (Scooters of this era were not subject to standardized crash testing like modern automobiles).

Active Features

Braking System:

Front and rear drum brakes.

Lighting:

Headlight, taillight, brake light, turn signals (where equipped).

Passive Features

Frame Construction:

Steel tube frame providing basic structural integrity.

Horn:

Standard horn for signaling.

💡 Technology Features

Infotainment

Infotainment System:

N/A (Basic mechanical scooter, no electronic infotainment system).

Driver Assistance

Driver Assistance Features:

N/A (No electronic driver assistance features).

Connectivity

Connectivity Features:

N/A (No electronic connectivity features).

🔧 Maintenance

Service Intervals

Oil Change Interval:

Refer to manual for specific mileage/time intervals; typically every 1000-2000 miles or annually.

Spark Plug Replacement:

Every 3000-5000 miles or annually, depending on usage.

Air Filter Cleaning:

Cleaned every 500-1000 miles, replaced every 5000-10000 miles or as needed.

Transmission Oil Check:

Check gear oil level regularly; replacement interval typically every 6000-10000 miles. (Note: QT50 uses a separate transmission oil, not mixed with fuel).

Fluid Specifications

Engine Oil Type:

Yamalube 2-stroke oil (or equivalent API TC, JASO FD rated 2-stroke oil) mixed at 50:1 ratio with gasoline.

Transmission Oil Type:

Yamalube Gear Oil (or SAE 80 API GL-4 or GL-5 gear oil), capacity approx. 0.08 Liters (refer to manual for exact type and quantity).

Brake Fluid Type:

N/A (Drum brakes typically do not use hydraulic fluid).

Known Issues

Common Problems:

Carburetor clogging due to infrequent use or stale fuel, electrical contact issues, worn drive belt, weak ignition coils, stator failure, carburetor intake manifold cracks leading to air leaks.

Preventative Maintenance Tips:

Regular fuel stabilizer use, periodic carburetor cleaning, checking electrical connections, ensuring proper 2-stroke oil mixture.

📚 Vehicle History

Brand Heritage

Yamaha Legacy:

Yamaha Motor Corporation, established in 1955, has a long history in motorcycles, musical instruments, and other motorized products, known for innovation and quality.

Model Evolution

Qt50 Lineage:

The QT50 was part of Yamaha's entry into the growing scooter market of the late 1970s and 1980s, offering an affordable and practical mode of transport. It was a successor to earlier Yamaha moped/scooter designs.

Production

Production Years:

Approximately 1979-1992 (manual covers a specific portion of this range).

Manufacturing Location:

Likely manufactured in Japan, consistent with Yamaha's primary production facilities for this era.

🏆 Awards & Recognition

Recognitions

Model Specific Awards:

No specific major awards are widely documented for the QT50 itself, but it contributed to Yamaha's reputation for reliable and accessible personal transportation during its production run.