Yamaha QT50 QT 50 1979-1992 Workshop Service Manual Repair

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🏷️ Basic Information Identification Make: Yamaha Model: QT50 Model Designation: QT 50 Model Code: QT50 Generation Production Start Year: 1979 Production End Year: 1992 Codes Chassis Code Prefix: 2T0 👋...

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类型: Motorcycle

斯库: 56685

标签: 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 Motorcycle Motorcycles QT 50 QT50 QT50 MA50 Yamaha

产品多属性

Description

🏷️ Basic Information

Identification

Make:

Yamaha

Model:

Model Designation:

QT 50

Model Code:

Generation

Production Start Year:

Production End Year:

Codes

Chassis Code Prefix:

👋 Introduction

Market Position

Segment:

Lightweight Moped / Scooter

Target Audience:

Enthusiasts, owners, and mechanics requiring in-depth maintenance and repair information for the Yamaha QT50.

Competitive Analysis

Competitors:

Honda Spree, Suzuki FA50, Tomos Revival, various other 50cc two-stroke mopeds of the era.

Key Features

Vehicle Type:

Step-through moped with automatic transmission.

Manual Value Proposition:

Provides essential, factory-level repair and maintenance data for preserving the longevity and performance of the Yamaha QT50.

📋 Manual Details

Coverage Areas

Covered Model Years:

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

Page Count

Estimated Pages:

Manual Type

Type:

Workshop Service Manual / Repair Manual

Language

Language:

English

Format

Format:

PDF Download

📖 Manual Coverage

Systems Covered

Engine:

Complete overhaul, tuning, diagnostics, carburetor, ignition system, cooling system, lubrication.

Transmission:

Automatic CVT (Torque Converter) system, belt replacement, clutch, gear oil.

Chassis:

Frame inspection, suspension (front fork, rear shock), steering system, wheel bearings.

Brakes:

Front drum brake, rear drum brake, brake cable adjustment and replacement, master cylinder (if applicable).

Electrical:

Wiring diagrams, lighting system, ignition coil, battery, charging system (stator, rectifier/regulator), switches, fuses.

Fuel System:

Fuel tank, fuel lines, fuel filter, carburetor (Mikuni VM series).

Body And Frame:

Body panels, seat, handlebars, fenders, fairings, decals, storage compartment.

Procedures Included

Maintenance:

Routine checks, oil changes, spark plug replacement, air filter cleaning/replacement, chain adjustment (if applicable), brake adjustments, lubrication points.

Repair:

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

Troubleshooting:

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

Diagnostics:

Engine performance issues, electrical system faults, starting problems.

Technical Depth

Depth:

Comprehensive, covering everything from basic owner maintenance to full engine and transmission rebuilds, including detailed diagnostic procedures and specifications.

📊 Manual Specifications

File Format

Quality:

High-resolution PDF, searchable text, clear diagrams and images.

Print Quality

Usability:

Optimized for digital viewing and printing. Pages can be printed individually or as a complete manual.

Binding Type

Digital Format:

N/A (Digital Download)

Paper Type

Digital Format:

N/A (Digital Download)

⚙️ Engine Specifications

Primary Engine

Type:

Two-stroke, single-cylinder, air-cooled

Displacement:

49.2 cc

Bore:

39.0 mm

Stroke:

41.0 mm

Compression Ratio:

7.2:1

Carburetor Model:

Mikuni VM15SA

Carburetor Specifications:

Main Jet: #82.5, Pilot Jet: #17.5, Needle Jet: 6F52-3, Throttle Valve: #2.0, Air Screw: 1.5 Turns Out

Performance

Horsepower:

Approx. 4.0 HP @ 6500 RPM (Varies slightly by year and market)

Torque:

Approx. 3.3 lb-ft @ 6000 RPM (Varies slightly by year and market)

Fuel System

Fuel Type:

Unleaded gasoline

Fuel Mixture:

Pre-mix: 50:1 ratio (Gasoline to 2-stroke oil)

Oil Type:

Yamaha 2-stroke oil or equivalent API-TC rated oil

🔧 Transmission

Standard

Type:

Automatic Continuously Variable Transmission (CVT)

Drive Belt Part Number:

3X3-17641-00-00

Features

Engagement Type:

Centrifugal clutch with automatic variator.

Gear Reduction:

Reduction gear system for final drive.

📐 Dimensions

Exterior

Overall Length:

Approx. 1650 mm (65 in)

Overall Width:

Approx. 660 mm (26 in)

Overall Height:

Approx. 980 mm (38.6 in)

Wheelbase:

Approx. 1140 mm (44.9 in)

Ground Clearance:

Approx. 100 mm (3.9 in)

Weights

Dry Weight:

Approx. 65 kg (143 lbs)

Wet Weight:

Approx. 70 kg (154 lbs) (with fluids)

Max Load Capacity:

Approx. 90 kg (198 lbs) (rider and cargo)

🛡️ Safety Features

Active Features

Braking System:

Front and rear drum brakes, operated by handlebar levers.

Lighting:

Headlight, taillight, brake light, turn signals (front and rear), instrument panel illumination.

Passive Features

Frame Construction:

Steel frame providing a stable platform.

Tires:

Tubed tires, typically sized 2.50-10 or similar for both front and rear.

💡 Technology Features

Infotainment

Instrument Cluster:

Analog speedometer, odometer, indicator lights for turn signals, high beam, and neutral (if applicable).

Driver Assistance

No electronic driver assistance features.

Connectivity

No connectivity features.

🔧 Maintenance

Service Intervals

Oil Change Frequency:

2-stroke oil reservoir refill as needed, based on oil level indicator.

Spark Plug Replacement:

Every 3,000 km (1,860 miles) or annually, check gap every 1,500 km (930 miles).

Air Filter Cleaning:

Every 1,000 km (620 miles) or annually. Replace as needed.

Transmission Oil Change:

Inspect and change every 6,000 km (3,700 miles) or every 2 years. Use Yamaha Gear Oil GL-4 80W-90.

Cvt Belt Inspection:

Inspect every 3,000 km (1,860 miles). Replace every 6,000 km (3,700 miles) or if signs of wear are present.

Fluid Specifications

Engine Oil:

Yamaha 2-stroke engine oil (50:1 ratio premix)

Gear Oil:

Yamaha Gear Oil GL-4 80W-90

Known Issues

Carburetor Clogging:

Common with older two-stroke engines due to fuel varnish or debris. Requires regular cleaning.

Cvt Belt Wear:

Belts can stretch or fray over time, affecting acceleration and top speed. Regular inspection and replacement are crucial.

Electrical Connections:

Corrosion on connectors can lead to intermittent electrical faults. Cleaning and dielectric grease are recommended.

Exhaust Carbon Buildup:

Two-stroke engines can accumulate carbon in the exhaust port and muffler, leading to reduced performance. Periodic de-carbonizing is beneficial.

📚 Vehicle History

Brand Heritage

Manufacturer:

Yamaha Motor Corporation, established in 1955, with a strong legacy in motorcycles and engines.

Model Evolution

Development:

The QT50 was part of Yamaha's entry into the burgeoning moped market, offering a stylish and user-friendly option for urban commuting and recreational use.

Production

Manufacturing Location:

Primarily Japan

Sales Period:

Produced from 1979 through 1992, making it a long-running model in its class.

🏆 Awards & Recognition

Recognitions

The QT50 was a popular and reliable model, widely recognized for its user-friendliness and affordability within the moped market of its era.