Segment:
Lightweight sport-oriented motorcycle
Target Demographic:
Commuters, new riders, budget-conscious enthusiasts
Key Competitors:
Yamaha YZF-R125, Honda CBR125R, Kawasaki Ninja 125, Suzuki GSX-R125
Design Philosophy:
Sporty styling, lightweight performance, affordability
Manual Value Proposition:
Enables DIY maintenance and repair, reduces reliance on costly dealer services, promotes understanding of vehicle mechanics
Engine:
Complete disassembly, assembly, repair, and checks
Cooling System:
Radiator, hoses, coolant, fan (if applicable)
Fuel System:
Carburetor/Injection system, fuel pump, fuel lines, tank
Ignition System:
Spark plugs, ignition coils, CDI unit
Exhaust System:
Muffler, exhaust pipes, gaskets
Transmission:
Gearbox, clutch, shifting mechanism
Drivetrain:
Chain, sprockets, rear wheel hub
Brakes:
Front and rear brake systems (hydraulic or cable), master cylinder, calipers, pads, discs
Suspension:
Front forks (telescopic), rear shock absorber(s), linkages
Steering:
Handlebars, steering stem, bearings
Electrical System:
Battery, charging system (stator, regulator/rectifier), starter motor, lighting, wiring harness, fuses
Instrumentation:
Speedometer, tachometer, indicator lights
Bodywork:
Fairings, seat, fenders, fuel tank panels, chassis components
Maintenance:
Regular servicing, lubrication, adjustments, fluid changes
Troubleshooting:
Diagnosis of common problems, fault finding guides
Repair:
Component repair, part replacement, engine rebuilds
Disassembly Assembly:
Step-by-step instructions for taking apart and putting back together components
Checks:
Inspections for wear, damage, and correct operation
Installation:
Procedures for installing new parts or accessories
Depth:
Comprehensive, covering all aspects from basic maintenance to in-depth repair and diagnostics
Engine Type:
Four-stroke, single-cylinder, liquid-cooled (common for this class)
Displacement:
Approximately 125cc (specifics vary by market and sub-model)
Bore X Stroke:
Refer to manual for exact specifications
Compression Ratio:
Refer to manual for exact specifications
Horsepower:
Typically in the 10-15 HP range (regulated for licensing in many regions)
Torque:
Refer to manual for exact specifications
Fuel Delivery:
Carburetor or Electronic Fuel Injection (EFI), depending on model year and market
Fuel Type:
Unleaded Gasoline
Fuel Tank Capacity:
Refer to manual for exact specifications (typically 8-12 liters)
Overall Length:
Refer to manual for exact specifications
Overall Width:
Refer to manual for exact specifications
Overall Height:
Refer to manual for exact specifications
Wheelbase:
Refer to manual for exact specifications
Dry Weight:
Refer to manual for exact specifications (typically 120-140 kg)
Curb Weight:
Refer to manual for exact specifications
Cargo Capacity:
N/A (Motorcycle)
Crash Test Results:
N/A (Motorcycle safety is assessed differently than automobiles)
Braking System:
Disc brakes front and rear (often with optional ABS)
Lighting:
Headlight, taillight, turn signals
Frame Construction:
Steel twin-spar or diamond frame
Tires:
Sport-oriented tire profile for grip
Oil Change:
Refer to manual for specific mileage/time intervals (typically every 3,000-6,000 km or 6-12 months)
Chain Lubrication Adjustment:
Regularly, as per manual recommendations (e.g., every 500-1000 km)
Valve Clearance Check:
Refer to manual for specific intervals (e.g., every 10,000-20,000 km)
Spark Plug Replacement:
Refer to manual for specific intervals
Engine Oil:
Refer to manual for specific grade (e.g., SAE 10W-40 or 15W-50), API classification (e.g., SG or higher), and JASO MA/MA2
Coolant:
Ethylene glycol-based coolant with corrosion inhibitors, mixed with distilled water (refer to manual for specific type and ratio)
Brake Fluid:
DOT 3 or DOT 4 hydraulic brake fluid (refer to manual for specific type)
Fork Oil:
Refer to manual for specific type and viscosity (e.g., SAE 10W)
Electrical Gremlins:
Some owners report occasional minor electrical issues, particularly with aging wiring or connectors (covered in troubleshooting section).
Carburetor Tuning:
Carbureted models may require periodic tuning or cleaning for optimal performance, especially with fuel quality variations.
Vibration At Speed:
Common in single-cylinder engines of this class; addressable through proper balancing and maintenance.
Suspension Softness:
Stock suspension can sometimes feel a bit soft for heavier riders or aggressive riding; fork oil weight can be adjusted.
Manufacturer:
Hyosung (South Korea)
Parent Company:
Part of the Hyosung Group, known for diverse manufacturing
Introduction Period:
The RX125 has been produced in various iterations, with significant updates in styling and technology over the years.
Technological Advancements:
Shift from carbureted engines to fuel injection, improved suspension and braking systems over different model years.
Manufacturing Location:
Primarily South Korea, with potential assembly in other regions.
