Yamaha QT50 QT 50 1980 Full Service Repair Manual

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🏷️ Basic Information Identification Make: Yamaha Model: QT50 Year: 1980 Product Name: Yamaha QT50 QT 50 1980 Full Service Repair Manual Codes Chassis Code Primary: QT50A 👋 Introduction Market Position...

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类型: Motorcycle

斯库: 510114

标签: 1980 Motorcycle Motorcycles QT 50 QT50 QT50 MA50 Yamaha

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Description

🏷️ Basic Information

Identification

Make:

Yamaha

Model:

Year:

Product Name:

Yamaha QT50 QT 50 1980 Full Service Repair Manual

Codes

Chassis Code Primary:

QT50A

👋 Introduction

Market Position

Segment:

Lightweight scooter, commuter vehicle.

Target Audience:

Owners seeking to maintain, repair, or restore their 1980 Yamaha QT50 scooter.

Competitive Analysis

Competitors 1980:

Honda Express, Tomos Revival, various other 50cc scooters of the era.

Key Features

Vehicle Type:

50cc Automatic Scooter (Moped Class)

Design Philosophy:

Simplicity, fuel efficiency, ease of use for urban commuting.

Manual Value Proposition:

Provides comprehensive, authoritative guidance for all service and repair needs, enabling owners to extend the life and preserve the originality of their QT50.

📋 Manual Details

Coverage Areas

Engine Service:

Included

Transmission Service:

Included

Electrical System:

Included

Fuel System:

Included

Suspension And Steering:

Included

Braking System:

Included

Frame And Bodywork:

Included

Troubleshooting:

Included

Maintenance Schedules:

Included

Page Count

Estimated Pages:

Manual Type

Type:

Full Service Repair Manual

Language

Language:

English

Format

Format:

Digital (PDF)

📖 Manual Coverage

Systems Covered

Engine Mechanical:

Top-end, bottom-end, cylinder, piston, crankshaft, connecting rod, lubrication system, cooling system (air-cooled).

Engine Fuel System:

Carburetor overhaul (VM10/11 type), fuel tank, fuel lines, fuel filter.

Engine Ignition System:

CDI ignition system, spark plug specifications, timing.

Engine Exhaust System:

Muffler and exhaust pipe inspection and replacement.

Transmission System:

Automatic CVT (Continuously Variable Transmission) disassembly, inspection, and adjustment; drive and driven pulleys; V-belt.

Drive Train:

Final drive system, bevel gears, drive shaft, rear wheel hub.

Electrical System:

Wiring diagrams, lighting system (headlight, taillight, turn signals), horn, battery maintenance, charging system (stator, rectifier/regulator).

Braking System:

Front drum brake and rear drum brake service, brake shoe replacement, brake cable adjustment.

Suspension System:

Front fork disassembly, oil replacement, seal replacement; rear shock absorber inspection and replacement.

Steering System:

Handlebar, steering stem, headset bearing inspection and lubrication.

Wheels And Tires:

Tire pressure, tire replacement, wheel balancing (if applicable).

Bodywork And Frame:

Frame inspection, seat, fenders, side covers, handlebar grips, footrests.

Procedures Included

Routine Maintenance:

Oil changes, filter replacements, spark plug checks, chain/belt adjustments (if applicable), lubrication points.

Rebuilds And Overhauls:

Complete engine teardown and rebuild, carburetor overhaul, transmission component service.

Troubleshooting Guides:

Diagnostic procedures for common problems, symptom-based troubleshooting charts.

Inspections:

Pre-ride inspections, periodic component checks.

Adjustments:

Carburetor idle speed, throttle cable, brake cables, CVT engagement speed.

Specifications Torque Values:

Detailed torque specifications for all critical fasteners.

Electrical Troubleshooting:

Wiring diagram interpretation, testing of electrical components.

Technical Depth

Depth:

Comprehensive, suitable for both DIY enthusiasts and professional mechanics.

Detail Level:

Detailed step-by-step instructions with clear diagrams and illustrations.

Diagnostic Capability:

Advanced diagnostic procedures for identifying root causes of issues.

📊 Manual Specifications

File Format

Format:

Searchability:

Searchable text for quick access to information.

Print Quality

Quality:

High-resolution, clear legible text and diagrams.

Printability:

Printable pages for physical reference.

Binding Type

Binding:

N/A (Digital Format)

Paper Type

Paper:

N/A (Digital Format)

⚙️ Engine Specifications

Primary Engine

Engine Type:

2-stroke, air-cooled, single-cylinder

Displacement:

49 cc (3.0 cu in)

Bore X Stroke:

39.0 mm x 41.0 mm (1.54 x 1.61 in)

Compression Ratio:

7.2:1

Carburetor Model:

Mikuni VM10/11 (specific variant depends on market)

Carburetor Jetting Main:

Typically #70 (subject to revision, consult manual for exact spec)

Carburetor Jetting Pilot:

Typically #15 (subject to revision, consult manual for exact spec)

Ignition System:

CDI (Capacitor Discharge Ignition)

Spark Plug Type:

NGK B-7HS or equivalent (confirm with manual)

Spark Plug Gap:

0.6 - 0.7 mm (0.024 - 0.028 in)

Performance

Horsepower:

~3.5 HP @ 6000 RPM (estimated, may vary by market tuning)

Torque:

Not typically specified for this class of engine, but adequate for intended use.

Fuel System

Fuel Type:

Unleaded gasoline, 87 octane (minimum)

Fuel Mixture:

Pre-mix at 50:1 ratio (Gasoline:Yamalube 2-stroke oil or equivalent).

Fuel Tank Capacity:

2.2 Liters (0.58 US gal)

🔧 Transmission

Standard

Type:

Automatic CVT (Continuously Variable Transmission)

Drive Pulley:

Primary sheave, spring, rollers.

Driven Pulley:

Secondary sheave, spring, clutch shoes.

V Belt Part Number:

904-12625-00-00 (Verify with manual)

Features

Engagement Speed:

Approx. 2500-3000 RPM (consult manual for precise figures and adjustment procedure)

📐 Dimensions

Exterior

Overall Length:

1,590 mm (62.6 in)

Overall Width:

665 mm (26.2 in)

Overall Height:

1,015 mm (40.0 in)

Wheelbase:

1,145 mm (45.1 in)

Ground Clearance:

115 mm (4.5 in)

Weights

Dry Weight:

55 kg (121 lbs)

Gross Vehicle Weight Rating:

Not explicitly stated, but designed for one rider plus minimal cargo.

🛡️ Safety Features

Ratings

Crash Test Results:

N/A (Vehicle class does not typically undergo standardized crash testing).

Active Features

Braking System:

Front and rear drum brakes for reliable stopping power.

Lighting:

Headlight, taillight, brake light, and turn signals for visibility.

Passive Features

Frame Construction:

Steel frame providing structural integrity.

Rider Ergonomics:

Upright riding position for rider comfort and control.

💡 Technology Features

Infotainment

Infotainment System:

N/A (Basic scooter, no integrated infotainment).

Driver Assistance

Driver Assistance Features:

N/A (No electronic driver assistance systems).

Connectivity

Connectivity Options:

N/A (No connectivity features).

🔧 Maintenance

Service Intervals

Oil Change Interval:

2-stroke oil: Check and top-up as needed. Initial fill required.

Spark Plug Check:

Every 1,000-2,000 km (600-1,200 miles) or annually.

Air Filter Cleaning:

Every 1,000-2,000 km (600-1,200 miles) or as needed based on operating conditions.

Brake Adjustment:

As needed, typically every 2,000 km (1,200 miles).

Cvt Belt Inspection:

Every 3,000-5,000 km (1,800-3,000 miles) for wear and tension.

Headset Lubrication:

Every 5,000 km (3,000 miles) or annually.

Fluid Specifications

2 Stroke Oil Type:

Yamalube 2-stroke oil or API-TC, JASO FB approved oil.

Gear Oil Type:

Yamaha Gear Oil or SAE 80 API GL-4 (check manual for specific viscosity grade).

Gear Oil Capacity:

Approx. 70 ml (consult manual for exact capacity).

Known Issues

Common Problem 1:

Carburetor gumming and clogging due to stale fuel or lack of use.

Common Problem 2:

CVT belt wear and failure, leading to loss of acceleration.

Common Problem 3:

Electrical component degradation (e.g., stator, rectifier/regulator) due to age.

Common Problem 4:

Soft or leaking front fork seals.

Common Problem 5:

Fuel line degradation (rubber components).

📚 Vehicle History

Brand Heritage

Yamaha History:

Yamaha Motor Company, established in 1955, has a long history of producing motorcycles, scooters, and musical instruments, known for innovation and quality.

Model Evolution

Qt Series Context:

The QT50 was part of Yamaha's entry into the popular lightweight scooter market of the late 1970s and early 1980s, designed for accessible personal transport.

Production

Production Years:

Approx. 1979-1983

Manufacturing Location:

Japan (primary)

🏆 Awards & Recognition

Recognitions

Historical Acclaim:

Recognized for its reliability and ease of use in its class during its production run.

Ratings

Fuel Efficiency Rating:

Excellent (typical for 50cc 2-stroke scooters).

Certifications

Emissions Standards:

Compliant with 1980-era emissions standards (consult specific market regulations).