Segment:
Lightweight, urban-oriented scooter.
Competitors:
Honda Spree, Honda Elite 50, Suzuki FZ50, Tomos Revival.
User Friendliness:
Designed for ease of operation and maintenance, ideal for city commuting.
Reliability:
Yamaha's reputation for durable and reliable two-stroke engines.
Affordability:
Generally a cost-effective mode of transportation.
Engine:
Complete engine disassembly, assembly, tuning, and troubleshooting.
Fuel System:
Carburetor service, fuel pump, fuel lines, and filter.
Electrical System:
Ignition system, lighting, charging system, starter, wiring diagrams, and component testing.
Drivetrain:
V-belt drive system, clutch, transmission, and final drive.
Brakes:
Front and rear brake system maintenance, adjustment, and component replacement.
Suspension:
Front fork and rear shock absorber service, adjustment, and replacement.
Steering:
Steering column, handlebars, and steering bearing service.
Frame And Body:
Body panel removal and installation, seat, and chassis components.
Cooling System:
Air cooling system analysis.
Maintenance:
Scheduled maintenance, lubrication points, and general upkeep.
Troubleshooting:
Diagnostic guides for common problems and fault finding.
Repair:
Step-by-step instructions for component repair and replacement.
Disassembly Assembly:
Detailed procedures for dismantling and reassembling major vehicle components.
Adjustments:
Carburetor, brake, and clutch adjustments.
Depth:
Comprehensive, suitable for professional technicians and experienced DIY mechanics.
Type:
Two-stroke, air-cooled, single-cylinder
Bore X Stroke:
39.0 mm x 41.5 mm
Horsepower:
Approx. 4.2 HP @ 7000 RPM (varies slightly by market/tuning)
Torque:
Approx. 0.34 kgf-m (3.3 Nm) @ 6500 RPM (varies)
Carburetor Model:
Mikuni VM10/16 (specific part number varies, e.g., 309-00001-00)
Fuel Type:
Unleaded gasoline (minimum 87 octane)
Fuel Oil Mixture:
Premix, 100:1 ratio (use Yamalube 2-stroke oil)
Fuel Tank Capacity:
3.0 Liters (0.79 US gal)
Crash Test Results:
N/A (Not typically crash-tested for this vehicle class)
Brakes:
Drum brakes front and rear.
Lighting:
Headlight, taillight, brake light, turn signals.
Frame Construction:
Steel tube frame.
Mirrors:
Dual rearview mirrors.
Features:
Basic instrumentation: speedometer, odometer, fuel gauge, indicator lights.
Features:
N/A (No electronic driver assistance systems).
Features:
N/A (No connectivity features).
Oil Change Transmission:
Every 3,000 km (1,800 miles) or 1 year.
Spark Plug Inspection:
Every 1,000 km (600 miles).
Air Filter Cleaning:
Every 1,000 km (600 miles).
V Belt Inspection:
Every 3,000 km (1,800 miles).
Transmission Oil Capacity:
0.06 Liters (0.06 US qt)
Brake Fluid Type:
DOT 3 or DOT 4 brake fluid (check for specific type depending on brake system)
Carburetor Clogging:
Common issue in older scooters due to stale fuel; requires regular cleaning and servicing.
V Belt Wear:
Wear and tear on the V-belt can lead to slipping or breakage; replacement interval should be adhered to.
Electrical Connections:
Corrosion or loose connections in the wiring harness can cause intermittent electrical faults.
Two Stroke Carbon Buildup:
Carbon deposits can build up in the exhaust port and combustion chamber, affecting performance.
Company Focus:
Yamaha Motor Company is renowned for its motorcycles, musical instruments, and marine products, with a strong heritage in performance and engineering.
Qt50 Lineage:
The QT50 was part of Yamaha's line of small-displacement, user-friendly scooters, designed for the emerging lightweight motorcycle market of the late 20th century.
Production Years:
The QT50 was produced through the late 1980s and into the 1990s, with the 1991 model being a later iteration.
Manufacturing Location:
Likely manufactured in Japan or Southeast Asia by Yamaha.
