Segment:
Lightweight Supersport / Sportbike
Target Audience:
Beginner to intermediate riders, enthusiasts seeking sporty performance in a manageable package, and those interested in track day or spirited street riding.
Key Competitors:
KTM RC 125, Honda CBR125R, Kawasaki Ninja 125 (where available), Aprilia RS 125.
Design Philosophy:
Emulates the styling and ergonomics of Yamaha's larger R-series sportbikes, offering a premium feel and aggressive appearance.
Performance Focus:
Designed for agile handling and engaging performance in the 125cc class, making it a popular choice for A1 license holders.
Covered Years:
2008, 2009, 2010, 2011, 2012
Covered Models:
Yamaha YZF-R125 R 125 (All variants for the specified years)
Page Count:
Refer to actual manual content, typically 300-500 pages for comprehensive service manuals.
Manual Type:
Service Repair Workshop Manual
Language:
English (Primary language for typical international market distribution)
Format:
Digital (PDF) - Searchable and printable
Engine:
Complete engine disassembly, assembly, diagnosis, and repair of all internal and external components including lubrication, cooling, and fuel systems.
Transmission:
Clutch operation, gearbox disassembly and assembly, shift mechanism, and lubrication.
Fuel System:
Fuel injection system (EFI), throttle body, fuel pump, injectors, sensors, and associated components.
Ignition System:
Ignition coil, spark plug, ECU control, and timing.
Electrical System:
Battery, charging system, lighting, starting system, wiring diagrams, fuses, relays, and electronic control units (ECU).
Chassis Frame:
Frame inspection, steering system, swingarm, and suspension linkage.
Suspension:
Front fork (telescopic, upside-down type) disassembly, service, and adjustment; rear shock absorber and linkage service.
Brakes:
Front and rear disc brake systems, hydraulic components, caliper service, brake fluid replacement, and bleeding procedures.
Wheels Tires:
Wheel bearing service, tire replacement, and balancing.
Cooling System:
Radiator, cooling fan, coolant hoses, water pump, and thermostat service.
Exhaust System:
Muffler and exhaust pipe removal, installation, and gasket replacement.
Bodywork Fairings:
Fairing removal and installation, seat, fuel tank, and minor body panel adjustments.
Diagnostics:
Troubleshooting guides for common problems, error code interpretation (if applicable), and diagnostic procedures.
Routine Maintenance:
Oil changes, filter replacements, spark plug checks, chain adjustment, brake pad checks, fluid level checks, and air filter service.
Major Repairs:
Engine rebuilds, transmission overhauls, suspension component replacement, and electrical system repairs.
Troubleshooting:
Step-by-step guides to diagnose and fix common issues with the engine, electrical system, and other components.
Component Replacement:
Detailed instructions for replacing parts such as brake discs, levers, cables, and sensors.
Specifications Data:
Torque values for all fasteners, clearances, fluid capacities, and other critical technical data.
Wiring Diagrams:
Comprehensive electrical wiring diagrams for all systems, aiding in troubleshooting and repair.
Depth Level:
Comprehensive (from basic maintenance to complete engine and chassis rebuilds)
Engine Type:
Liquid-cooled, 4-stroke, SOHC, 4-valve
Bore X Stroke:
52.0 mm x 58.6 mm
Compression Ratio:
11.2:1
Engine Mounting:
Transverse
Max Power:
11.0 kW (15 PS) @ 9,000 rpm (EU regulated for A1 license)
Max Torque:
12.4 Nm (1.26 kg-m) @ 8,000 rpm
Fuel Delivery:
Electronic Fuel Injection (EFI)
Throttle Body:
Mikuni 33 mm
Fuel Type:
Unleaded gasoline, minimum 95 RON
Instrument Cluster:
Digital LCD display with speedometer, tachometer, fuel gauge, gear indicator, clock, trip meters, and indicator lights.
ABS:
Optional Anti-lock Braking System (ABS) available on select models, enhancing braking safety.
ECU:
Engine Control Unit (ECU) manages fuel injection, ignition timing, and other engine parameters for optimal performance and emissions.
Oil Change Interval:
Every 5,000 km (3,000 miles) or 6 months, whichever comes first.
Oil Filter Replacement:
At every oil change.
Air Filter Cleaning Interval:
Every 10,000 km (6,000 miles) or 12 months.
Spark Plug Replacement:
Every 10,000 km (6,000 miles).
Chain Lubrication Inspection:
Every 1,000 km (600 miles) or after riding in rain.
Brake Fluid Replacement:
Every 2 years or as per manual recommendation.
Engine Oil Type:
Yamaha recommends Yamalube 4 (or equivalent) SAE 10W-40, API SG or higher.
Engine Oil Capacity:
1.00 Liter (without filter change), 1.10 Liter (with filter change).
Coolant Type:
Permanent type antifreeze coolant (50% mixture with distilled water).
Common Wear Items:
Clutch plates, brake pads, tires, chain and sprockets due to spirited riding.
Electrical Gremlins:
Infrequent reports of minor electrical connection issues or sensor faults, typically resolvable with proper inspection and tightening.
Engine Reliability:
Generally considered very reliable, but proper maintenance is crucial, especially for the cooling system and oil changes.
