Segment:
Lightweight commuter scooter
Target Audience:
Enthusiasts, DIY mechanics, restorers of vintage scooters
Competitors General:
Honda Spree, Tomos Revival, various other 50cc mopeds of the era
Vehicle Strengths:
Lightweight, fuel-efficient, simple mechanics, cult following
Value Proposition:
Provides essential, detailed information for owners to maintain and repair their classic Yamaha QT50, preserving its operational life and value.
Engine System:
Complete overhaul, tuning, carburetor, ignition, exhaust
Transmission System:
Automatic transmission (CVT) inspection, adjustment, repair
Fuel System:
Fuel tank, fuel lines, carburetor, fuel filter
Electrical System:
Wiring diagrams, lighting, ignition system, charging system, battery
Brake System:
Front and rear brake mechanisms, adjustments, fluid replacement
Suspension System:
Front fork, rear shock absorber, spring inspection and service
Cooling System:
Air-cooled engine, cylinder head cooling fins
Chassis And Frame:
Frame inspection, steering system, wheels, tires
Bodywork And Trim:
Fairings, body panels, seat, fenders
Maintenance Procedures:
Routine checks, oil changes, filter replacement, spark plug service
Repair Procedures:
Engine rebuilding, carburetor tuning, brake bleeding, electrical component replacement
Troubleshooting Guides:
Diagnostic charts for common problems, symptom analysis
Reassembly Guides:
Step-by-step instructions for component reinstallation
Adjustment Procedures:
Carburetor idle speed, throttle cable, brake levers
Depth:
Comprehensive from basic maintenance to full engine overhaul and chassis rebuild
Searchability:
Searchable text for quick information retrieval
Digital Quality:
High-resolution, clear text and diagrams
Binding:
Not applicable (Digital PDF)
Paper Quality:
Not applicable (Digital PDF)
Engine Type:
2-stroke, air-cooled
Bore X Stroke:
39.0 mm x 41.4 mm
Carburetor Model:
Mikuni VM10
Ignition Type:
CDI (Capacitor Discharge Ignition)
Horsepower:
Approx. 3.5 HP @ 6500 RPM
Torque:
Approx. 2.6 lb-ft @ 5500 RPM
Fuel Type:
Unleaded gasoline, 2-stroke oil mixture (e.g., 50:1 ratio)
Fuel Tank Capacity:
2.0 Liters (0.53 US Gallons)
Oil Type:
Yamalube 2 (or equivalent API TC, JASO FB 2-stroke oil)
Oil Tank Capacity:
0.5 Liters
Crash Test Ratings:
Not Applicable (Moped/Scooter classification does not typically undergo automotive crash testing)
Brakes:
Front Drum Brake, Rear Drum Brake
Lighting:
Headlight, Taillight, Turn Signals (front and rear)
Oil Change:
Every 1,000 km (600 miles) or annually (whichever comes first)
Air Filter Cleaning:
Every 1,000 km (600 miles)
Spark Plug Replacement:
Every 5,000 km (3,000 miles) or as needed based on condition
Transmission Oil Change:
Every 3,000 km (1,800 miles) or annually
Brake Adjustment:
As needed, check every 2,000 km (1,200 miles)
2 Stroke Oil Spec:
Yamalube 2 or equivalent API TC / JASO FB
Gear Oil Spec:
SAE 80W API GL-4
Common Wear Items:
Carburetor gumming, carburetor jets clogging, CDI unit failure, fuel line deterioration, drive belt wear
Electrical Problems:
Corroded connections, weak charging system due to age
Engine Performance:
Loss of power due to worn piston rings or carburetor issues
Yamaha Motor Company:
Founded in 1955, Yamaha Motor Company is renowned for its diverse product line including motorcycles, scooters, marine products, and musical instruments. They have a long history of innovation and performance in the powersports industry.
Qt50 Lineage:
The QT50 followed Yamaha's earlier popular moped and scooter models, offering a stylish and user-friendly option for urban commuting and light recreational use. It represents a generation of simple, air-cooled 2-stroke scooters.
Production Period:
Produced from 1981 through the early 1990s (specific end date varies by market). The 1989 model is part of the later production run.
Manufacturing Location:
Primarily manufactured in Japan
