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Yamaha QT50 QT 50 1979-1992 Service Repair Workshop Manual

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🏷️ Basic Information Identification Make: Yamaha Model: QT50 Common Name: Yamaha QT50 QT 50 Generation Production Years: 1979-1992 Codes Chassis Code: QT50 👋 Introduction Market Position Segment: Lightweight scooter, popular...
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Type: Motorcycle
Vendor:
Yamaha
Sku: 57960
Tags: 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 Motorcycle Motorcycles QT50 QT50 MA50 Yamaha
Yamaha QT50 QT 50 1979-1992 Service Repair Workshop Manual
🏷️ Basic Information
Identification
Make:
Yamaha
Model:
QT50
Common Name:
Yamaha QT50 QT 50
Generation
Production Years:
1979-1992
Codes
Chassis Code:
QT50
👋 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:
N/A
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:
N/A
Connectivity
Features:
N/A
🔧 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.
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