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Yamaha

Yamaha MA50 QT50 Yamahopper Complete Workshop Service Repair Manual 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991

Yamaha MA50 QT50 Yamahopper Complete Workshop Service Repair Manual 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991

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Vehicle data plateRef 570917
Brand
Yamaha
Vehicle
Motorcycle
Models covered
MA50, Motorcycles, QT50, QT50 MA50, Yamahopper
Years
1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991
Format
PDF, searchable, print-ready
Delivery
Instant download after checkout
Language
English

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🏷️ Basic Information
Identification
Make:
Yamaha
Model:
MA50 / QT50 Yamahopper
Common Nickname:
Yamahopper
Product Type:
Complete Workshop Service Repair Manual
Codes
Engine Code Primary:
MA50
Model Code Primary:
QT50
👋 Introduction
Market Position
Segment:
Lightweight scooter/moped segment, popular for recreational use and urban mobility in its era.
Competitive Analysis
Competitors:
Competed with other 50cc scooters and mopeds from manufacturers like Honda (e.g., Spree, Elite), Tomos, and various European and Asian brands during the late 70s and 80s.
Key Features
Features:
Automatic transmission, lightweight construction, easy to operate, rugged design suitable for varied terrain (within limits), iconic styling of its time.
Value Proposition
Manual Benefit:
Empowers owners to perform all necessary maintenance and repairs, saving significant costs associated with dealership servicing and promoting self-sufficiency.
📋 Manual Details
Coverage Areas
Applicable Years:
1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991
Model Variants Covered:
All Models, Engines, Trim, and Transmission Types
Page Count
Estimated Page Count:
Detailed page count not specified, but described as comprehensive 'A-Z' coverage.
Manual Type
Type:
Workshop Service Repair Manual
Language
Language:
English
Format
Format:
Downloadable Digital Format (PDF compatible)
📖 Manual Coverage
Systems Covered
Engine Mechanical:
Complete engine overhaul, including top-end and bottom-end assembly, piston, rings, crankshaft, connecting rod, cylinder, cylinder head, valve timing, lubrication system.
Fuel System:
Carburetor disassembly, cleaning, adjustment, and rebuilding; fuel tank, fuel lines, fuel filter maintenance.
Ignition System:
Ignition timing, spark plugs, coil, CDI unit, magneto, wiring diagnostics.
Cooling System:
Air cooling system inspection and maintenance (note: typically air-cooled for this model).
Transmission Drive:
Automatic transmission (V-belt type) inspection, adjustment, belt replacement, clutch engagement, and drivetrain maintenance.
Suspension System:
Front fork service, rear shock absorber inspection and replacement, linkage lubrication and adjustment.
Braking System:
Front and rear brake system overhaul, including drum brake adjustment, cable maintenance, lever and pedal servicing.
Electrical System:
Wiring diagrams, lighting systems (headlight, taillight, indicators), horn, battery maintenance, charging system (if applicable).
Chassis Frame:
Frame inspection, steering head bearing service, wheel bearing maintenance, general chassis component checks.
Bodywork Trim:
Plastic body panel removal and installation, seat service, handlebar components, control cables.
Procedures Included
Routine Maintenance:
Oil changes, filter replacements, chain adjustment (if applicable), tire pressure checks, lubrication points.
Troubleshooting:
Diagnostic procedures for common running issues, starting problems, electrical faults, and performance degradation.
Repair Overhaul:
Step-by-step instructions for dismantling, repairing, and reassembling all major vehicle components.
Component Adjustment:
Specific procedures for adjusting brakes, clutch, carburetor idle, throttle cables, and suspension.
Wiring Diagrams:
Detailed electrical schematics for accurate diagnosis and repair of the electrical system.
Torque Specifications:
Crucial torque values for critical fasteners to ensure correct assembly and prevent component damage.
Technical Depth
Depth:
Comprehensive - from basic user maintenance to complete engine rebuilds and electrical diagnostics. Suitable for home mechanics and professional technicians alike.
📊 Manual Specifications
File Format
Digital Format:
PDF (Portable Document Format) or similar compatible electronic file.
Print Quality
Quality:
High Quality - designed for clarity with step-by-step instructions and accompanying pictures.
Binding Type
Binding:
N/A (Downloadable format, user can print and bind as needed).
Paper Type
Paper:
N/A (Downloadable format, user can print on preferred paper).
⚙️ Engine Specifications
Primary Engine
Engine Type:
Two-stroke, single-cylinder, air-cooled
Displacement:
49cc
Bore X Stroke:
Approximately 39.0 mm x 41.4 mm (Typical for 50cc 2-stroke engines, specific values in manual).
Performance
Horsepower:
Estimated 4-5 HP (typical for this class, specific figures in manual).
Torque:
Torque figures not typically emphasized for this model, focus on usability.
Fuel System
Carburetor Type:
Mikuni VM-series carburetor (common for Yamaha of this era), specific model number detailed in manual.
Fuel Type:
Unleaded gasoline, 87 octane recommended. Pre-mix oil required for lubrication.
Oil Mixing Ratio:
Typically 50:1 or 100:1 ratio of gasoline to 2-stroke oil, specified in manual.
Lubrication
Oil Type:
Yamalube 2-stroke oil or equivalent API TC-W3 certified oil.
🔧 Transmission
Standard
Type:
Automatic V-belt (CVT - Continuously Variable Transmission) with torque converter.
Optional
Optional Transmission:
N/A - Single automatic transmission option.
Features
Drive System:
Shaft drive (typical for many Yamaha scooters).
Clutch Type:
Centrifugal clutch.
📐 Dimensions
Exterior
Overall Length:
Refer to manual for precise measurements, typically around 1600-1700mm for 50cc scooters.
Overall Width:
Refer to manual for precise measurements, typically around 600-700mm.
Overall Height:
Refer to manual for precise measurements, typically around 1000-1100mm.
Weights
Dry Weight:
Approximately 60-70 kg (typical for this class, precise figure in manual).
Gross Vehicle Weight Rating:
Refer to manual for specific GVWR.
Fuel Tank Capacity:
Approximately 3.0-4.0 liters, including reserve. Specific capacity detailed in manual.
🛡️ Safety Features
Ratings
Crash Test Results:
N/A - Scooters of this era were not subjected to standardized crash testing like modern automobiles.
Active Features
Braking System Type:
Drum brakes front and rear.
Lighting:
Headlight, taillight, brake light, turn signals (indicators).
Passive Features
Frame Construction:
Steel tube frame, designed for stability and rider support.
💡 Technology Features
Infotainment
Infotainment System:
N/A - Basic analog instrumentation (speedometer, odometer, indicator lights).
Driver Assistance
Assistance Features:
N/A - No electronic driver assistance systems.
Connectivity
Connectivity Features:
N/A - No electronic connectivity features.
🔧 Maintenance
Service Intervals
Oil Change Interval:
Refer to manual for specific intervals, typically every 1000-2000 km or annually for gearbox oil.
Spark Plug Replacement:
Refer to manual, typically around every 3000-5000 km or as needed based on condition.
Air Filter Cleaning:
Frequent checks recommended, cleaning/replacement every 1000-2000 km depending on operating conditions.
V Belt Inspection Replacement:
Inspect periodically, replace as needed or according to manual's recommended mileage (e.g., every 10,000-15,000 km).
Fluid Specifications
Gearbox Oil Type:
Yamaha Gear Oil 10W-30 or equivalent SAE 80 API GL-3 hypoid gear oil.
Brake Fluid Type:
DOT 3 or DOT 4 brake fluid (if hydraulic brakes were ever fitted to specific variants, though typically cable-actuated).
Known Issues
Common Wear Items:
V-belt wear, carburetor clogging due to fuel varnish, ignition coil failure, wear in suspension bushings, brake cable stretching.
Engine Performance Degradation:
Loss of power due to worn piston rings, carbon buildup in the combustion chamber, or incorrect carburetor jetting/adjustment.
📚 Vehicle History
Brand Heritage
Yamaha Motor Co:
Yamaha Motor Corporation is renowned for its musical instruments and its extensive range of motorcycles, scooters, ATVs, and marine products.
Model Evolution
Yamahopper Lineage:
The MA50/QT50 Yamahopper was part of Yamaha's efforts to penetrate the growing global market for small-displacement, economical, and fun-to-ride scooters.
Production
Manufacturing Period:
Produced from approximately 1979 through 1991, covering a significant period in scooter design and popularity.
🏆 Awards & Recognition
Recognitions
Industry Awards:
No specific industry awards are commonly cited for this model, but it was a popular choice in its segment for reliability and fun factor.
Ratings
Consumer Satisfaction:
Generally well-regarded for its intended purpose, known for being a robust and reliable lightweight scooter if maintained properly.

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