Segment:
Lightweight scooter, urban mobility
Target Audience:
Owners, DIY mechanics, restoration enthusiasts
Era Competition:
Honda Spree, Tomos, various smaller European and Japanese scooters
Vehicle Type:
Automatic scooter with a step-through frame
Design Philosophy:
Simplicity, fuel efficiency, urban maneuverability
Primary Focus:
Comprehensive service and repair
Geographic Applicability:
Global (standard Yamaha specifications)
Estimated Pages:
Likely 200-300+ pages (typical for full service manuals of this era)
Type:
Full Service Repair Manual
Format:
Digital (likely PDF, common for sales of older manuals)
Engine:
Detailed overhaul, tuning, lubrication, cooling, fuel delivery, ignition system
Transmission:
Automatic transmission (CVT) service, fluid, adjustments, component repair
Brakes:
Front and rear brake system maintenance, adjustment, and component replacement
Electrical:
Wiring diagrams, lighting system, ignition system, battery service, charging system
Chassis:
Frame inspection, suspension components, steering system, wheel bearings
Body:
Body panel removal/installation, seat, storage compartment access
Maintenance:
Routine maintenance, oil changes, filter replacements, lubrication points, spark plug checks
Troubleshooting:
Diagnostic charts for common problems, symptom-based solutions
Repair:
Component disassembly, assembly, and repair for all major systems
Rebuild:
Engine rebuild procedures, carburetor overhaul, transmission rebuild guidance
Refurbishment:
Guidance for restoring original specifications and appearance
Depth:
Comprehensive, covering basic maintenance to full engine and transmission rebuilds
Diagnostics:
Detailed diagnostic procedures and specifications
Specifications:
Torque values, clearances, timing specifications, fluid capacities
Configuration:
Single-cylinder, two-stroke
Displacement:
49 cc (approximately)
Bore X Stroke:
Specific dimensions will be in the manual (e.g., 39.0 x 41.4 mm)
Cooling System:
Forced air cooling
Ignition System:
CDI (Capacitor Discharge Ignition)
Starting System:
Kick starter, potentially electric start (verify specific model)
Horsepower:
Likely in the range of 4-5 HP (specifications available in manual)
Torque:
Specific torque figures will be detailed in the manual
Fuel Type:
Unleaded gasoline mixed with 2-stroke oil
Carburetor:
Mikuni VM type (specific model number in manual)
Oil Delivery:
Autolube system (separate oil reservoir)
Length:
Specific dimensions available in the manual
Width:
Specific dimensions available in the manual
Height:
Specific dimensions available in the manual
Dry Weight:
Typically around 55-60 kg (refer to manual for exact specification)
Gross Vehicle Weight Rating:
GVWR will be specified in the manual
Crash Test Ratings:
Not applicable (scooter, no formal crash ratings like cars)
Braking System:
Drum brakes front and rear
Lighting:
Headlight, taillight, brake light, turn signals (where applicable)
Frame Construction:
Steel frame for rigidity
Oil Change:
Engine oil (gearbox oil) change intervals specified in manual (e.g., every 3,000-5,000 km or annually)
Spark Plug:
Spark plug inspection and replacement intervals outlined in manual
Air Filter:
Air filter cleaning/replacement schedule detailed
Belt Drive:
CVT belt inspection and replacement intervals are critical and found in the manual
Engine Oil:
For the 2-stroke engine, the manual specifies the correct 2-stroke oil mix ratio (e.g., 20:1 or 32:1, typically pre-mix or autolube)
Gearbox Oil:
Specific viscosity and type for the final drive gearbox (e.g., SAE 80W-90) will be listed
Brake Fluid:
Type and bleeding procedures for the brake system (if hydraulic)
Carburetor Clogging:
Common issue in older two-strokes due to fuel degradation or gumming. Manual provides cleaning procedures.
Cvt Belt Wear:
Belts can degrade over time and need replacement for proper acceleration and speed. Manual details inspection and replacement.
Ignition System Maintenance:
Spark plug fouling or CDI unit issues can occur. Manual aids in diagnosis.
Manufacturer:
Yamaha Motor Company, Japan
Motorcycle Legacy:
Yamaha has a long history of producing motorcycles, scooters, and marine products, known for innovation and performance.
Qt Series:
The QT series represented Yamaha's entry into the lightweight scooter market, focusing on practicality and affordability.
Production Years:
The QT50 was produced in the early 1980s, with 1982 being a specific model year.
Manufacturing Location:
Likely manufactured in Japan or potentially other Yamaha production facilities.
