Market Segment:
Lightweight scooter, popular for urban commuting and recreational use. Positioned as a reliable and economical mode of transport.
Competitors:
Competes with similar 50cc scooters from brands like Honda (e.g., Dio, Tact), Suzuki (e.g., Lets), and Kymco.
Design Philosophy:
Retro-styled design reminiscent of classic scooters, offering a blend of vintage aesthetics and modern functionality. Known for its compact size and maneuverability.
Engine:
Complete engine disassembly, assembly, inspection, repair, troubleshooting, specifications (e.g., bore, stroke, compression ratio, valve timing).
Fuel System:
Carburetor (cleaning, adjustment, rebuilding), fuel tank, fuel lines, fuel pump (if applicable).
Ignition System:
CDI unit, spark plug, ignition coil, timing specifications, troubleshooting.
Cooling System:
Air cooling system (engine fins inspection, cleaning).
Exhaust System:
Muffler, exhaust pipe inspection and replacement.
Transmission:
Automatic transmission (CVT), clutch, drive belt, variator inspection and replacement, gearbox lubrication.
Brakes:
Front and rear brake systems (drum or disc depending on market specification), brake shoe/pad replacement, brake lever, cable adjustment, brake fluid replacement (if applicable).
Suspension:
Front fork (oil level, seal replacement), rear shock absorber inspection and replacement.
Steering:
Handlebar, steering stem bearing inspection and lubrication, adjustment.
Electrical System:
Wiring diagrams, battery, starter motor, generator, lighting (headlight, taillight, indicators), horn, switches, fuses, troubleshooting.
Chassis Frame:
Frame inspection, body panel removal and installation, seat, luggage rack.
Routine Maintenance:
Oil change intervals, air filter replacement, spark plug checks, carburetor cleaning, brake adjustments, tire pressure checks.
Troubleshooting:
Diagnostic procedures for common starting issues, poor running conditions, electrical faults, braking problems.
Repair Procedures:
Step-by-step instructions for component removal, replacement, and reassembly for all major systems.
Diagnostics:
Identification of symptoms and causes of mechanical and electrical failures.
Depth Level:
Comprehensive; covers everything from basic rider maintenance to complete engine rebuilds and electrical system diagnostics.
Engine Type:
Two-stroke, air-cooled, single-cylinder
Displacement:
49cc (approx.)
Bore X Stroke:
Refer to manual for exact specifications (typically around 39.0 mm x 41.4 mm)
Compression Ratio:
Refer to manual for exact specifications (typically around 7.0:1)
Horsepower:
Approx. 4.5 - 5.0 HP (at ~6500 RPM) - varies slightly by market and tuning.
Torque:
Refer to manual for exact specifications.
Fuel Delivery:
Carburetor (e.g., Mikuni VM11/18 or similar specification).
Fuel Type:
Unleaded gasoline (minimum octane rating specified in manual, typically 87 RON).
Fuel Tank Capacity:
Approx. 4.0 - 5.0 Liters (refer to manual for exact specification).
Oil System:
Autolube system (premix of gasoline and 2-stroke oil).
2 Stroke Oil Specification:
API TC, JASO FB or FD certified 2-stroke oil recommended. Refer to manual for specific Yamaha recommendation.
Overall Length:
Approx. 1700 mm (refer to manual for exact specification)
Overall Width:
Approx. 650 mm (refer to manual for exact specification)
Overall Height:
Approx. 1030 mm (refer to manual for exact specification)
Wheelbase:
Approx. 1205 mm (refer to manual for exact specification)
Dry Weight:
Approx. 70 - 75 kg (refer to manual for exact specification)
Curb Weight:
Approx. 75 - 80 kg (refer to manual for exact specification)
Front Tire Size:
3.00-10 42J (or similar, refer to manual)
Rear Tire Size:
3.00-10 42J (or similar, refer to manual)
Wheel Type:
Steel, 10-inch diameter
Bolt Pattern:
N/A (typical scooter hub mounting)
Safety Certifications:
CE, EPA, CARB (depending on market of original sale).
Braking System:
Independent front and rear braking controls. Typically front drum and rear drum for this era, though some markets may have had front disc.
Lighting:
Headlight, taillight, brake light, turn signals for visibility.
Engine Oil Change:
Recommended every 1,000 - 2,000 km or annually, depending on usage. Specific interval in manual. Note: Gearbox oil is separate for 2-strokes.
Air Filter Cleaning Replacement:
Clean every 1,000 km, replace every 2,000 - 3,000 km or as needed based on operating environment. Manual will specify.
Spark Plug Check Replacement:
Check every 1,000 km, replace every 3,000 - 5,000 km or if fouled. Manual will provide exact type and gap.
Drive Belt Inspection Replacement:
Inspect every 5,000 km, replace typically around 10,000 - 15,000 km or when wear is evident. Refer to manual.
Gearbox Oil:
Yamalube Gear Oil 10W-30 or equivalent (API GL-4) - Capacity approx. 0.10 Liters. Refer to manual.
Brake Fluid:
If equipped with front disc brake: DOT 3 or DOT 4 brake fluid. If only drum brakes, no hydraulic fluid required. Refer to manual.
Common Wear Items:
Drive belt, clutch shoes, variator rollers, brake shoes/pads, spark plug, air filter, and carburetor jets are common wear items on 50cc scooters of this era.
Carburetor Issues:
Can be prone to clogging from stale fuel or debris, requiring regular cleaning and adjustment, especially if not used frequently.
Autolube System:
Autolube pump can fail or lines can clog, leading to engine seizure. Requires proper 2-stroke oil and consistent topping up.
Manufacturer Heritage:
Yamaha Motor Company, established in 1955, with a rich history in motorcycles, marine products, and other motorized vehicles. Known for innovation and performance.
Vin Designation:
VIN prefix indicates Yamaha origin and model series. Specific digits decode year, origin, and manufacturing plant.
Production Period:
The Vino model has had multiple generations, with the YJ50RN representing an early iteration of this stylish, retro-designed scooter.
