Yamaha QT50 QT 50 1979-1992 Workshop Service Repair Manual

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🏷️ Basic Information Identification Make: Yamaha Model: QT50 Nickname: Yamaha QT50QT50 Codes Model Code: QT50 👋 Introduction Market Position Market Segment: Lightweight scooter, popular for urban commuting and recreational use....

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Type: Motorcycle

Vendor:

Sku: 389477

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

Product variants

Description

🏷️ Basic Information

Identification

Make:

Yamaha

Model:

Nickname:

Yamaha QT50QT50

Codes

Model Code:

👋 Introduction

Market Position

Market Segment:

Lightweight scooter, popular for urban commuting and recreational use.

Competitive Analysis

Competitors:

Honda Spree, Suzuki FA50, Tomos Revival.

Key Features

Vehicle Type:

Moped/Scooter

Target Audience:

Young riders, urban commuters, hobbyists.

📋 Manual Details

Coverage Areas

Applicable Years:

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

Page Count

Page Count:

Manual Type

Manual Type:

Workshop Service Repair Manual

Language

Language:

English

Format

Format:

📖 Manual Coverage

Systems Covered

Engine System:

Complete engine overhaul, tuning, diagnostics, carburetor, ignition, cooling.

Transmission System:

Automatic transmission (CVT), gearbox, clutch, final drive.

Chassis System:

Frame, suspension (front and rear), steering system, wheels, tires.

Brake System:

Front drum brake, rear drum brake, hydraulic system, brake cable adjustment.

Electrical System:

Wiring diagrams, lighting, ignition system, battery, charging system, starter.

Fuel System:

Fuel tank, fuel lines, fuel filter, fuel pump (if applicable), carburetor service.

Exhaust System:

Muffler, exhaust pipe inspection and replacement.

Bodywork And Trim:

Body panels, seat, handlebars, fenders, fairings (if applicable).

Procedures Included

Maintenance Procedures:

Regular servicing, lubrication, filter replacement, spark plug replacement, chain adjustment.

Troubleshooting Guides:

Step-by-step diagnostic procedures for common and uncommon issues.

Repair Procedures:

Detailed instructions for disassembly, assembly, and repair of all major components.

Specifications And Tolerances:

Torque values, clearances, gap settings, and critical dimensions.

Wiring Diagrams:

Comprehensive electrical system schematics for accurate troubleshooting.

Special Tool Requirements:

Identification of specific tools needed for certain procedures.

Technical Depth

Depth Of Coverage:

Comprehensive, covering routine maintenance to complete engine rebuilds and electrical system diagnostics.

📊 Manual Specifications

File Format

File Format:

Print Quality

Print Quality:

High-resolution, clear text and diagrams suitable for printing.

Binding Type

Binding Type:

N/A (Digital PDF)

Paper Type

Paper Type:

N/A (Digital PDF)

⚙️ Engine Specifications

Primary Engine

Engine Type:

2-stroke, reed valve, air-cooled

Displacement:

Bore X Stroke:

39.0 mm x 41.8 mm

Compression Ratio:

7.0:1 (typical)

Performance

Horsepower:

Approx. 3.5 - 4.0 HP (specific figures vary by year/tuning)

Torque:

Not widely specified, but designed for low-end acceleration.

Fuel System

Carburetor Model:

Mikuni VM14 (typical, may vary slightly)

Fuel Type:

Unleaded gasoline (91 octane or higher recommended)

Fuel Mixture:

2-stroke oil mixed with gasoline (typically 50:1 or 100:1, consult manual for exact ratio).

🔧 Transmission

Standard

Transmission Type:

Automatic (Continuously Variable Transmission - CVT)

Features

Drive Type:

Belt drive to rear wheel

Clutch Type:

Automatic centrifugal clutch

📐 Dimensions

Exterior

Overall Length:

Approx. 1,770 mm (69.7 in)

Overall Width:

Approx. 640 mm (25.2 in)

Overall Height:

Approx. 1,030 mm (40.6 in)

Weights

Dry Weight:

Approx. 65 kg (143 lbs)

Fuel Tank Capacity:

Approx. 4.0 liters (1.06 US gal)

Oil Tank Capacity:

Approx. 1.0 liter (0.26 US gal) for 2-stroke oil

🛡️ Safety Features

Ratings

Safety Certification:

Meets relevant DOT or local moped safety standards of its production era.

Active Features

Braking System:

Front and rear drum brakes.

Passive Features

Lighting:

Headlight, taillight, brake light, turn signals (depending on market spec).

💡 Technology Features

Infotainment

Infotainment System:

N/A (Basic moped design).

Driver Assistance

Assistance Features:

N/A (Basic moped design).

Connectivity

Connectivity Options:

N/A (Basic moped design).

🔧 Maintenance

Service Intervals

Oil Change Interval:

Check 2-stroke oil reservoir level regularly, refill as needed.

Air Filter Cleaning:

Every 1,000-2,000 km or as specified in the manual, depending on operating conditions.

Spark Plug Replacement:

Every 3,000-5,000 km, or as needed based on inspection.

Carburetor Cleaning:

As needed, or every 5,000-10,000 km for optimal performance.

Fluid Specifications

Two Stroke Oil:

API TD, JASO FB or FC certified 2-stroke engine oil.

Gear Oil:

Yamalube Hypoid Gear Oil GL-4 or equivalent (e.g., SAE 80).

Brake Fluid:

DOT 3 or DOT 4 brake fluid (for models with hydraulic brakes, if applicable – QT50 typically uses cables).

Known Issues

Carburetor Clogging:

Common in older 2-stroke engines due to fuel instability or dirt ingress. Requires cleaning and sometimes rebuilding.

Ignition System Wear:

Points and condenser (on older models) or CDI unit can fail, affecting spark.

Drive Belt Wear:

CVT belt can stretch or break over time, affecting acceleration and top speed. Requires periodic inspection and replacement.

Air Leakage:

Leaked intake manifold gaskets or crank seals can cause lean conditions and poor running.

📚 Vehicle History

Brand Heritage

Manufacturer Focus:

Yamaha Motor Corporation is renowned for its innovation in motorcycles, scooters, and musical instruments. Established in 1955.

Model Evolution

Model Introduction:

The QT50 was part of Yamaha's lineup of small-displacement, user-friendly scooters designed for accessibility and urban mobility.

Production

Production Period:

1979-1992

🏆 Awards & Recognition

Recognitions

Industry Accolades:

While specific awards for the QT50 are not widely documented, Yamaha's scooters of this era were recognized for reliability and value.