Category:
Lightweight Scooter / Moped
Target Audience:
Urban commuters, recreational riders, young riders, DIY mechanics.
Key Competitors:
Honda Ruckus (Zoomer), Kymco Agility 50, Aprilia Scarabeo 50, SYM Fiddle II 50.
Vehicle Appeal:
Rugged design, agile handling, easy operation, fuel efficiency, low ownership costs, Yamaha reliability.
Benefit To Owner:
Empowers owners to perform routine maintenance, diagnose issues, and complete repairs efficiently, saving time and money while ensuring optimal performance and longevity.
Engine And Powertrain:
Complete engine disassembly, assembly, tuning, diagnostics, lubrication system, cooling system (air-cooled), fuel system (carburetor, fuel pump), ignition system, exhaust system.
Chassis And Suspension:
Frame, front fork, rear shock absorber, steering system, wheel and tire specifications, brake system (front and rear drum brakes).
Electrical System:
Wiring diagrams, battery, charging system (stator, regulator/rectifier), lighting system (headlight, taillight, turn signals), starter system, ignition switch, instrumentation.
Bodywork And Trim:
Body panel removal and installation, seat, storage compartment, handlebars, controls, decals.
Maintenance:
Scheduled maintenance intervals, oil changes, air filter cleaning/replacement, spark plug replacement, brake adjustment, tire pressure checks, drive belt inspection and replacement.
Troubleshooting:
Diagnostic procedures for common performance issues, electrical faults, starting problems, braking concerns.
Repair And Rebuild:
Step-by-step instructions for engine rebuilding, carburetor overhaul, brake component replacement, suspension fork service, electrical component repair.
Specifications And Data:
Torque specifications for all fasteners, clearances, fluid capacities, electrical resistance values, diagnostic parameters.
Depth:
Comprehensive, covering all aspects from basic user maintenance to complete engine rebuilds and complex electrical diagnostics. Suitable for DIY enthusiasts and professional technicians.
Engine Type:
4-Stroke, 2-Valve, SOHC
Engine Displacement:
49cc
Bore X Stroke:
39.0 mm x 41.4 mm
Compression Ratio:
12.0 : 1
Cooling System:
Forced Air Cooling
Horsepower Estimated:
3.4 hp @ 7000 rpm (approximate, model dependent)
Torque Estimated:
2.7 lb-ft @ 6500 rpm (approximate, model dependent)
Fuel Delivery:
Carburetor: Mikuni VM17
Fuel Tank Capacity:
1.2 L (0.32 gal)
Recommended Fuel:
Unleaded gasoline, Octane rating 86 or higher
Oil Type:
Yamalube 4 (or equivalent) SAE 10W-30 API SE, SF or SG
Oil Capacity:
0.80 L (0.85 US qt)
Ignition Type:
CDI (Capacitor Discharge Ignition)
Spark Plug Type:
NGK CR6HSA or Denso U20FS-U
Spark Plug Gap:
0.6 - 0.7 mm (0.024 - 0.028 in)
Transmission Type:
Automatic CVT (Continuously Variable Transmission)
Drive System:
V-belt drive
Clutch Type:
Dry, centrifugal clutch
Gear Reduction:
Specify reduction ratios if available in manual, e.g., primary: X.XXX:1, secondary: Y.YYY:1
Transmission Oil Type:
Specify manual oil type if applicable, typically 4-stroke motorcycle gear oil
Safety Standards:
Complies with applicable federal motor vehicle safety standards (FMVSS) for mopeds in relevant markets.
Braking System:
Front: Drum brake, Rear: Drum brake. Manual details effective braking techniques and maintenance.
Lighting:
Halogen headlight, taillight, brake light, front and rear turn signals for visibility.
Frame Construction:
Steel tube frame designed for stability and maneuverability.
Tires:
Front: 120/90-10 56J, Rear: 130/90-10 59J (typical sizes, verify in manual).
First Service:
Typically at 600 miles (1,000 km) for initial inspection, oil change, and adjustments. Manual will detail exact intervals.
Regular Maintenance:
Oil changes every 1,200 miles (2,000 km) or 6 months, air filter cleaning every 1,200 miles, spark plug replacement every 3,000 miles (5,000 km). Manual provides a detailed schedule.
Engine Oil:
Yamalube 4 (or equivalent) SAE 10W-30 API SE, SF or SG
Gear Oil:
Specify SAE 80 or 90 hypoid gear oil (e.g., Yamalube Gear Oil) if applicable for final drive.
Brake Fluid:
DOT 3 or DOT 4 hydraulic brake fluid (for hydraulic systems, if present, though Zuma 50 typically uses drum brakes which may not have fluid).
Common Wear Items:
Drive belt, brake shoes, tires, air filter, spark plug. Manual guides on inspection and replacement.
Carburetor Maintenance:
Carburetors can become clogged with debris or varnish if fuel sits for extended periods, requiring cleaning and synchronization. Manual provides detailed carburetor service procedures.
Manufacturer History:
Yamaha Motor Corporation is a Japanese manufacturer known for its wide range of motorcycles, scooters, marine products, and musical instruments, established in 1955.
Zuma Lineage:
The Zuma 50 (YW50) introduced a distinct 'rugged scooter' aesthetic with its distinctive dual headlights and aggressive styling, carving out a niche in the urban mobility market. It built upon Yamaha's expertise in small-displacement engines and reliable transmissions.
Manufacturing Origin:
Likely manufactured in Japan or by Yamaha's global manufacturing facilities.
