Segment:
Urban Scooter / Commuter Scooter
Target Audience:
Urban commuters, riders seeking practical and economical transportation, DIY enthusiasts
Key Competitors:
Honda PCX125, Kymco Agility 125, SYM Fiddle II 125
Design:
Rugged, adventurous styling with a step-through frame and rugged tires
Performance:
Fuel-efficient liquid-cooled engine, automatic transmission for ease of use
Practicality:
Underseat storage, comfortable seating, robust suspension for varied road conditions
Engine:
Complete disassembly, inspection, assembly, troubleshooting, performance adjustments
Fuel System:
Fuel injection system (FI), throttle body, fuel pump, injectors, fuel tank, lines
Ignition System:
Ignition coil, spark plug, CDI unit, troubleshooting
Cooling System:
Liquid cooling system, radiator, fan, coolant flow, thermostat
Transmission:
Automatic Continuously Variable Transmission (CVT) disassembly, inspection, belt replacement, clutch, variator
Brakes:
Front and rear disc brake systems, caliper maintenance, brake fluid replacement, bleeding procedures, master cylinder
Suspension:
Front telescopic fork, rear unit swingarm, shock absorber maintenance, fork oil replacement
Steering:
Handlebar assembly, steering stem bearings, front fork alignment
Electrical System:
Wiring diagrams, battery, charging system (stator, regulator/rectifier), starter motor, lighting, indicators, horn, fuses
Chassis Frame:
Frame inspection, body panels removal and installation, seat, storage compartment
Wheels Tires:
Wheel removal and installation, tire inspection, recommended tire pressures
Routine Maintenance:
Oil changes, filter replacements, spark plug service, chain/belt adjustments (N/A for CVT), brake checks
Troubleshooting:
Detailed diagnostic procedures for common and uncommon issues, symptom-based troubleshooting guides
Component Overhaul:
Complete rebuild procedures for engine, transmission, and braking systems
Electrical Diagnostics:
Testing of sensors, actuators, lighting circuits, and charging system components
Suspension Servicing:
Fork seal replacement, shock absorber inspection, bearing maintenance
Fuel System Cleaning:
Throttle body cleaning, injector cleaning procedures
Bodywork Repair:
Panel removal, installation, and minor repair guidance
Depth:
Comprehensive (from basic maintenance to complete engine and transmission rebuilds)
Diagnostic Codes:
Includes information on reading and interpreting diagnostic trouble codes (DTCs) if applicable to the FI system
Torque Specifications:
Detailed torque values for all fasteners and critical components
Wiring Diagrams:
Full, detailed electrical wiring diagrams for all model variations covered
Engine Type:
4-stroke, SOHC, 2-valve, liquid-cooled
Bore X Stroke:
52.4 mm x 57.9 mm
Compression Ratio:
12.0:1
Cooling Method:
Liquid Cooling
Horsepower Est:
~9.8 HP @ 7,500 rpm (Varies slightly by year)
Torque Est:
~7.5 lb-ft @ 6,000 rpm (Varies slightly by year)
Fuel Delivery:
Electronic Fuel Injection (EFI)
Fuel Tank Capacity:
6.0 Liters (1.59 Gallons)
Recommended Fuel:
Unleaded gasoline, 87 octane or higher
Oil Type:
Yamalube 4 (or equivalent) 10W-40 API SG or higher
Oil Capacity W Filter:
1.00 Liter (1.06 US qt)
Oil Capacity W O Filter:
0.90 Liter (0.95 US qt)
Transmission Type:
Automatic, V-belt, Continuously Variable Transmission (CVT)
Final Drive:
Gear Reduction
Clutch:
Dry, centrifugal, automatic clutch
Variator Drive System:
Torque driver, drive pulley, V-belt
Transmission Oil Type:
Yamalube Gear Oil (or equivalent) SAE 80 API GL-4
Transmission Oil Capacity:
0.13 Liters (0.14 US qt)
Engine Oil Change:
Every 3,000 km (1,800 miles) or 6 months, whichever comes first
Oil Filter Replacement:
Every 6,000 km (3,600 miles) or 12 months
Spark Plug Check Replace:
Check every 3,000 km (1,800 miles), replace as needed (specific plug: NGK CR7E or similar)
Air Filter Cleaning Replacement:
Clean every 3,000 km (1,800 miles), replace as needed
Cvt Belt Inspection Replacement:
Inspect belt condition every 6,000 km (3,600 miles), replace typically between 15,000-20,000 km (9,000-12,000 miles) depending on usage
Transmission Oil Change:
Every 6,000 km (3,600 miles) or 12 months
Brake Fluid Replacement:
Every 2 years or as needed based on condition (DOT 4 recommended)
Coolant Replacement:
Every 2 years or as needed (Yamaha Coolant or equivalent)
Engine Oil:
Yamalube 4 (or equivalent) 10W-40 API SG or higher
Transmission Oil:
Yamalube Gear Oil (or equivalent) SAE 80 API GL-4
Coolant:
Permanent type coolant (50% solution), Yamaha Coolant recommended
Common Wear Items:
CVT belt, brake pads, tires, front fork seals
Potential Issues:
Occasional issues with idle stability on early models, rear shock absorber wear over time
Manufacturer:
Yamaha Motor Company, Ltd.
Heritage Focus:
Innovation, performance, and reliability in motorcycles and powersports
Zuma Lineage:
The Zuma 125 (BW125) introduced a more robust, adventure-styled scooter compared to traditional city scooters, building on the legacy of the Zuma 50 (BW50).
First Generation Debut:
Introduced in 2009 for the North American market, succeeding the Zuma 50 (BW50) and offering a larger displacement and more power.
Assembly Location Est:
Likely assembled in Japan or Southeast Asia by Yamaha
