Segment:
Entry-level commuter motorcycle, often targeting younger riders or those seeking economical urban transport.
Competitors:
Competes with other 125cc motorcycles from brands like Honda (CBR125R, CB125F), Yamaha (MT-125, YZF-R125), Suzuki (GSX-S125), Kawasaki (Ninja 125), and various other manufacturers in the lightweight sport and naked segments.
Affordability:
Typically positioned as an affordable option in its class.
Fuel Efficiency:
Known for good fuel economy suitable for city riding.
Ease Of Use:
Generally designed for ease of operation and maneuverability.
Engine:
Comprehensive engine maintenance and repair procedures.
Transmission:
Detailed information on gearbox operation, maintenance, and repair.
Fuel System:
Coverage includes fuel injection, carburetor systems, fuel pump, and fuel lines.
Electrical System:
Extensive wiring diagrams and troubleshooting for all electrical components, lighting, ignition, and charging systems.
Brakes:
Maintenance and repair procedures for hydraulic brake systems, including disc and drum configurations.
Suspension:
Front and rear suspension system diagnosis, repair, and component replacement.
Chassis:
Frame inspection, maintenance, and repair of chassis components.
Cooling System:
Radiator, fan, coolant, and thermostat system service.
Exhaust System:
Inspection and replacement of exhaust components.
Wheels And Tires:
Tire maintenance, wheel balancing, and replacement guidelines.
Disassembly Reassembly:
Step-by-step guides for complete disassembly and reassembly of major components.
Troubleshooting:
Diagnostic charts and procedures for identifying and resolving common and uncommon issues.
Maintenance:
Routine maintenance tasks including oil changes, filter replacements, and general inspections.
Adjustments:
Procedures for adjusting clutch, throttle, brakes, and other critical systems.
Technical Specifications:
Detailed technical data for all components and systems.
Depth:
Comprehensive from basic maintenance to complete engine rebuilds and advanced diagnostics.
Engine Type:
Likely a single-cylinder, four-stroke engine (specific configuration such as SOHC or DOHC depends on the exact RX125 variant, but commonly SOHC for this class).
Displacement:
Approximately 125cc (actual value may vary slightly by specific sub-model).
Horsepower:
Typically in the range of 10-15 HP, conforming to A1 license restrictions in many markets.
Torque:
Torque figures are modest, optimized for urban acceleration and low-end power delivery.
Fuel Delivery:
Could be carbureted or fuel-injected depending on the model year and market regulations.
Cooling Method:
Likely air-cooled, though some variants might feature liquid cooling for improved thermal management.
Emission Standards:
Designed to meet local emission standards for its production era (e.g., Euro 3, Euro 4).
Length:
Specific dimensions vary but typical for a 125cc sport/naked bike.
Width:
Specific dimensions vary but typical for a 125cc sport/naked bike.
Height:
Specific dimensions vary but typical for a 125cc sport/naked bike.
Dry Weight:
Typically in the range of 120-140 kg.
Fuel Capacity:
Usually around 10-13 liters.
Braking System:
Front disc brake and rear disc or drum brake. ABS may be an option on later models or specific variants.
Lighting:
Halogen or LED lighting for headlamp, tail lamp, and indicators.
Frame Construction:
Sturdy frame designed for stability and handling.
Instrument Cluster:
Likely features a combination of analog and digital displays for speedometer, tachometer, fuel gauge, and indicator lights.
ABS:
Anti-lock Braking System (ABS) may be available as an optional feature on certain models or model years.
Diagnostic Ports:
May include a diagnostic port for electronic fault code reading (for fuel-injected models).
Oil Change Interval:
Typically every 3,000 - 5,000 km or 6-12 months, depending on usage and oil type. Manual will specify exact interval and oil grade.
Spark Plug Replacement:
Recommended replacement at intervals specified in the manual, often around 6,000 - 10,000 km.
Chain Adjustment Lubrication:
Regular checks and lubrication recommended, typically every 500-1000 km or after riding in wet conditions.
Engine Oil Grade:
Likely SAE 10W-40 or 20W-50, API SG or higher, JASO MA certified. Manual is essential for exact specification.
Brake Fluid Type:
Typically DOT 3 or DOT 4 hydraulic brake fluid. Manual will confirm.
Coolant Type:
If liquid-cooled, a mixture of ethylene glycol-based antifreeze and distilled water. Manual will specify ratio and type.
Electrical Connections:
Some owners report occasional issues with electrical connectors due to vibration or moisture ingress. The manual's wiring diagrams are vital for diagnosis.
Carburetor Tuning:
Carbureted models may require periodic tuning for optimal performance and fuel economy, especially in varying altitudes or climates.
Chain And Sprockets:
Wear on the drive chain and sprockets is a common maintenance item for all chain-driven motorcycles.
Manufacturer:
Hyosung is a South Korean manufacturer known for producing a range of motorcycles, scooters, and ATVs.
Lineage:
The RX125 is part of Hyosung's offering in the popular 125cc motorcycle segment, often styled as a naked sportbike or a faired sportbike.
Production Period:
The RX125 has seen various iterations and updates throughout its production life. Specific model years covered by the manual are crucial for accuracy.
