Segment:
Lightweight Scooter
Target Audience:
Urban commuters, recreational riders, DIY enthusiasts.
Competitors:
Honda Metropolitan, Kymco Agility 50, SYM Mio 50.
Vehicle Strengths:
Robust build, agile handling, good fuel economy, distinctive rugged styling.
Manual Value Proposition:
Empowers owners to perform all necessary maintenance and repairs, saving on labor costs and ensuring longevity of the vehicle.
Systems Covered:
Engine, Fuel System, Ignition System, Electrical System, Cooling System, Transmission, Chassis, Suspension, Brakes, Steering, Bodywork, Troubleshooting, Maintenance, Specifications
Manual Type:
Full Service & Repair Manual
Engine:
Complete disassembly, inspection, assembly, valve adjustment, piston/ring replacement, cylinder boring, crankshaft inspection, bearing replacement.
Fuel System:
Carburetor service and adjustment, fuel pump testing, fuel filter replacement, fuel line inspection.
Ignition System:
CDI unit testing, spark plug specifications and replacement, ignition coil testing, stator and rotor inspection.
Electrical System:
Wiring diagrams, battery maintenance and testing, charging system inspection, starter motor operation, lighting system troubleshooting, fuse and relay testing.
Cooling System:
Radiator inspection and cleaning, coolant specifications, fan operation, thermostat testing.
Transmission:
CVT system inspection, drive and driven pulley service, belt replacement, gear oil specifications and change intervals.
Chassis:
Frame inspection, swingarm service, bearing lubrication and replacement.
Suspension:
Front fork service (oil change, seal replacement), rear shock absorber inspection and replacement.
Brakes:
Front and rear brake pad replacement, brake fluid specifications and bleeding procedures, brake caliper inspection and service, brake line inspection.
Steering:
Handlebar inspection, steering stem bearing service and adjustment.
Bodywork:
Panel removal and installation, seat service, lighting fixture replacement.
Maintenance:
Regular service checks, oil and filter changes, air filter cleaning/replacement, spark plug replacement, brake fluid flush, coolant checks, tire pressure monitoring.
Troubleshooting:
Step-by-step diagnostic guides for common and uncommon problems across all systems, including electrical gremlins and performance issues.
Repair:
Detailed instructions for component replacement, rebuild procedures for major assemblies, and alignment corrections.
Rebuilding:
Complete engine and transmission rebuild procedures, including torque specifications and clearances.
Restoration:
Guidance on disassembly, cleaning, part sourcing, and reassembly for bringing a Zuma back to original condition.
Alignment:
Steering alignment checks and adjustments.
Depth:
Comprehensive, from basic maintenance to full engine and transmission overhauls. Includes diagnostic flowcharts and specifications.
Engine Type:
4-stroke, Liquid-cooled, SOHC, 2-valve
Bore X Stroke:
39.0 mm x 41.4 mm
Compression Ratio:
12.0:1
Fuel Delivery:
Mikuni VM17 carburetor
Ignition System:
TCI (Transistor Controlled Ignition)
Spark Plug:
NGK CR7HSA (or equivalent)
Horsepower:
~3.4 HP @ 7500 rpm (estimated)
Torque:
~2.6 lb-ft @ 6000 rpm (estimated)
Fuel Tank Capacity:
5.0 Liters (1.3 US gal)
Fuel Type:
Unleaded gasoline, 87 octane (or higher)
Carburetor Idle Speed:
1500 - 1700 rpm
Crash Test Information:
N/A (Scooters typically not subjected to the same rigorous crash testing as cars)
Brakes:
Front: Hydraulic disc; Rear: Drum brake
Lighting:
Halogen headlight, LED taillight/brake light, front/rear turn signals.
Frame Construction:
Steel underbone frame for rigidity and durability.
Tires:
Tubeless tires for reduced risk of sudden deflation.
Engine Oil Change:
Every 3,000 km (1,800 miles) or 6 months.
Air Filter Cleaning:
Every 6,000 km (3,700 miles) or 12 months.
Transmission Oil Change:
Every 6,000 km (3,700 miles) or 12 months.
Spark Plug Replacement:
Every 12,000 km (7,500 miles).
Brake Fluid Replacement:
Every 24,000 km (15,000 miles) or 24 months.
Valve Clearance Check:
Every 12,000 km (7,500 miles).
Engine Oil Type:
Yamalube 4 (SAE 10W-40) API SG, SF, SE
Engine Oil Capacity:
0.80 Liters (0.85 US qt) without filter change, 0.90 Liters (0.95 US qt) with filter change.
Brake Fluid Type:
DOT 3 or DOT 4
Coolant Type:
Yamaha Coolant 50% or equivalent ethylene glycol-based coolant
Common Wear Items:
Drive belt, brake pads, tires, spark plug, air filter.
Potential Problems:
Carburetor jet clogging if fuel is not fresh, occasional electrical connection issues if exposed to excessive moisture.
Manufacturer Founding:
1887 (as Nippon Gakki Co., Ltd.)
Motorcycle Division Start:
1955
Zuma Introduction Year:
2002 (Original 50cc model)
Yw50Ap Generation:
Second generation Zuma 50 (introduced in 2008).
Design Philosophy:
Rugged, semi-off-road styling for a scooter, distinct from typical urban commuters.
Assembly Location:
Japan (primarily)
