Segment:
Lightweight Sport/Commuter Motorcycle
Target Audience:
Owners seeking to perform their own maintenance, repairs, and restorations, or independent repair shops.
Competitors:
Yamaha YBR125, Honda CBF125, Suzuki GS125
Value Proposition:
Comprehensive repair and maintenance information for extended vehicle lifespan and cost-effective ownership.
Manual Benefit:
Empowers owners with the knowledge to confidently service and repair their RX125, reducing reliance on expensive dealerships.
Engine:
Complete engine disassembly, assembly, tuning, diagnostics, and overhaul
Fuel System:
Carburetor service, fuel pump, fuel lines, fuel tank maintenance
Ignition System:
Spark plugs, ignition coil, CDI unit, timing
Transmission:
Clutch operation, gearbox disassembly and assembly, gear selection mechanisms
Cooling System:
Radiator, fan, coolant circulation, thermostat
Exhaust System:
Muffler, exhaust pipes, catalytic converter (if applicable)
Brakes:
Brake fluid, hydraulic system, caliper service, pad replacement, brake disc inspection
Suspension:
Front forks, rear shock absorbers, swingarm, linkage components
Steering:
Handlebars, steering stem, bearings, linkage
Electrical System:
Wiring diagrams, battery, charging system, lighting, starter motor, switches
Chassis Frame:
Frame inspection, component mounting, bodywork repair
Wheels Tires:
Wheel bearing service, tire pressure, rim inspection
Maintenance:
Regular servicing, oil changes, filter replacements, chain adjustment
Troubleshooting:
Diagnostic procedures for common and uncommon faults, symptom-based fault finding
Repair:
Step-by-step instructions for component repair and replacement
Rebuild:
Detailed procedures for complete engine and gearbox rebuilds
Refurbishment:
Guidance on restoring components to original specifications
Restoration:
Procedures for bringing older models back to prime condition
Depth:
Comprehensive: Covers basic maintenance to complete engine rebuilds and advanced diagnostics.
Diagnostic Tools:
Information on using basic hand tools and potentially specialized Hyosung diagnostic tools (if applicable).
Engine Type:
Four-stroke, single-cylinder, air-cooled (typical for this class and era)
Displacement:
125cc (nominal)
Bore X Stroke:
Specific values to be found in the manual, crucial for rebuilds.
Compression Ratio:
Specific values to be found in the manual.
Valve Train:
SOHC (Single Overhead Camshaft) or similar, depending on the specific variant.
Horsepower:
Typically in the range of 10-14 HP (subject to specific market tuning).
Torque:
Specific values to be found in the manual.
Carburetor Type:
Likely a Mikuni or Keihin carburetor (specific model number in manual).
Fuel Type:
Unleaded gasoline (Octane rating specified in manual).
Fuel Tank Capacity:
To be specified in the manual, crucial for range estimation.
Length:
Specific measurements in manual.
Width:
Specific measurements in manual.
Height:
Specific measurements in manual.
Dry Weight:
Specific weight in manual, important for handling and transport.
Curb Weight:
Specific weight in manual, including fluids.
Safety Compliance:
Adherence to relevant motorcycle safety standards of the era (e.g., DOT, ECE for lighting).
Braking System:
Front disc brake, rear drum brake (typical configuration).
Lighting:
Headlight, taillight, brake light, turn signals.
Infotainment System:
Basic instrumentation: Speedometer, odometer, fuel gauge (if equipped), indicator lights.
Driver Assistance Features:
N/A for this model and era; focused on fundamental mechanics.
Oil Change:
Recommended every 3,000-5,000 km or annually (specific interval in manual).
Spark Plug Replacement:
Recommended every 6,000-10,000 km (specific type and gap in manual).
Air Filter Cleaning Replacement:
Regular inspection and cleaning/replacement based on operating conditions (details in manual).
Chain Lubrication Adjustment:
Frequent lubrication and adjustment needed; specific interval and slack in manual.
Engine Oil Type:
API SG or higher, SAE 10W-40 or 20W-50 (verify in manual for exact specification).
Engine Oil Capacity:
Specific capacity (e.g., 1.2 L without filter change, 1.3 L with filter change) detailed in manual.
Brake Fluid Type:
DOT 3 or DOT 4 (verify in manual for exact specification).
Coolant Type:
If liquid-cooled, a specific ethylene glycol-based coolant mixture is required (details in manual).
Carburetor Tuning:
May require periodic adjustment or cleaning due to fuel variations or age.
Electrical Connections:
Corrosion or loose connections in older models can lead to intermittent issues.
Chain And Sprockets:
Wear is common and requires regular maintenance to prevent premature failure.