Market Segment:
Entry-level sportbike, targeted at younger riders or those seeking an affordable, high-performance 125cc motorcycle.
Key Competitors:
KTM RC 125, Honda CBR125R, Aprilia RS4 125, Suzuki GSX-R125 (later models).
Design Philosophy:
Sportbike styling inspired by Yamaha's larger R-series motorcycles, offering a premium feel in the 125cc class.
Aerodynamics:
Full fairing design contributing to its aggressive looks and improved aerodynamics.
Rider Ergonomics:
Sport-oriented riding position, emphasizing control and rider engagement.
Frame Design:
Deltabox-style frame for rigidity and sporty handling characteristics.
Engine Mechanical:
Complete disassembly, assembly, inspection, repair, and adjustment of the engine and its internal components.
Fuel System:
Fuel injection system (EFI), fuel pump, injectors, throttle body, fuel tank, lines, and pressure regulator.
Ignition System:
CDI, spark plugs, ignition coils, and related wiring.
Cooling System:
Radiator, fan, thermostat, water pump, coolant hoses, and fluid capacities.
Transmission:
Gearbox disassembly, assembly, inspection, clutch operation, and lubrication.
Chassis:
Frame, subframe, swingarm, and steering system inspection and maintenance.
Suspension:
Front forks (telescopic, inverted) and rear shock absorber disassembly, inspection, fluid changes, and adjustments.
Brakes:
Front and rear brake systems, hydraulic lines, calipers, master cylinders, brake pads, discs, bleeding procedures, and fluid specifications.
Electrical System:
Wiring diagrams, battery, charging system (stator, regulator/rectifier), starter motor, lights, sensors, and ECU.
Bodywork:
Fairing removal and installation, seat, fuel tank, and other cosmetic components.
Wheels And Tires:
Wheel bearing inspection, tire pressure, rim specifications, and tire replacement procedures.
Maintenance:
Scheduled maintenance, oil changes, filter replacements, chain adjustment, lubrication, and general upkeep.
Troubleshooting:
Systematic diagnostic procedures for common and uncommon problems, including symptom identification and resolution steps.
Repair:
Detailed, step-by-step instructions for repairing or replacing virtually all components of the motorcycle.
Disassembly Assembly:
Comprehensive guides for taking apart and putting back together all major systems and components.
Adjustments:
Precise instructions for adjustments such as valve clearance, throttle cable, clutch, and suspension settings.
Cleaning Lubrication:
Specific guidance on cleaning procedures and lubrication points for optimal performance and longevity.
Depth Level:
Comprehensive, from basic checks to full engine rebuilds and advanced diagnostics.
Diagnostic Information:
Includes diagnostic trouble codes (DTCs) and troubleshooting flowcharts for electronic systems.
Pictorial Diagrams:
Abundant, detailed illustrations, exploded diagrams, drawings, and photographs for clarity.
Special Tools:
References and illustrations for required special service tools (SSTs) and equipment.
Wear Limits:
Provides critical wear limits and tolerances for various engine and chassis components.
Oil Change Interval:
Refer to manual for specific mileage/time interval (typically every 6,000 km or 12 months).
Valve Clearance Check:
Refer to manual for specific mileage (typically around 24,000 km).
Chain Adjustment Interval:
Regular checks recommended, adjust as needed based on slack.
Engine Oil Type:
Yamalube 4 (or equivalent SAE 10W-40 API SG or higher, JASO MA)
Engine Oil Capacity:
Approx. 1.40 L (with oil filter change)
Coolant Type:
Yamaha Radiator Cleaner & Coolant (or equivalent permanent type, 50/50 mix with distilled water)
Fork Oil Type:
Yamaha Fork Oil G-10 or G-15 (or equivalent SAE 10W)
Common Wear Items:
Clutch plates, brake pads, chain and sprockets, wheel bearings, fork seals.
Electrical Gremlins:
While generally reliable, occasional sensor issues or wiring harness connections can occur, as detailed in the troubleshooting section.
Engine Performance:
Carbon build-up in combustion chamber over time, potential for valve seat wear if not maintained.
