Target Audience:
Owners, independent repair shops, and dealerships requiring authentic factory repair information for the Hyosung GF125.
Information Accuracy:
Directly sourced from manufacturer's original workshop manuals, ensuring the highest level of accuracy and completeness.
Accessibility:
Instant download access, enabling quick retrieval of critical repair information.
Cost Effectiveness:
Provides dealership-level information without the associated costs of physical manual acquisition or proprietary software subscriptions.
Engine:
Detailed disassembly, inspection, repair, and reassembly procedures for the GF125 engine. Includes cylinder head, piston, crankshaft, valve train, lubrication system, and cooling system.
Fuel System:
Carburetor (likely CV type for this era) removal, cleaning, adjustment, and troubleshooting; fuel tank, fuel lines, and fuel filter maintenance.
Transmission:
Clutch operation, maintenance, and adjustment; gearbox inspection and repair; shift mechanism.
Electrical System:
Complete wiring diagrams for all model variants; ignition system testing and repair; charging system (stator, rectifier/regulator); lighting circuits; starting system (starter motor, solenoid).
Brakes:
Front and rear brake system inspection, fluid replacement, pad/shoe replacement, caliper/wheel cylinder overhaul, and bleeding procedures.
Suspension:
Front fork (telescopic) disassembly, inspection, seal replacement, oil change, and adjustment; rear shock absorber maintenance and replacement; swingarm and linkage service.
Wheels And Tires:
Tire inspection, replacement, and balancing; wheel bearing service; spoke tension adjustment (if applicable).
Frame And Bodywork:
Frame inspection for damage, fairing and panel removal/installation, seat maintenance, and basic chassis component inspection.
Routine Maintenance:
Oil and filter changes, spark plug replacement, air filter cleaning/replacement, chain adjustment and lubrication, brake fluid checks, coolant checks (if liquid-cooled).
Troubleshooting:
Systematic diagnostic procedures for common starting, running, electrical, and braking issues.
Engine Rebuild:
Complete engine overhaul, including piston ring replacement, bearing inspection, gasket replacement, and component clearance checks.
Carburetor Tuning:
Detailed instructions for adjusting idle speed, air/fuel mixture, and synchronization (if applicable).
Electrical Diagnostics:
Testing of components like ignition coils, spark plug caps, battery, alternator, and starter motor using multimeter readings and visual inspection.
Brake Bleeding:
Step-by-step guide for removing air from the brake hydraulic system.
Depth Of Information:
Factory-level diagnostic and repair procedures, suitable for professional technicians and advanced DIY mechanics.
Diagrams And Illustrations:
Step-by-step diagrams for all workshop procedures, assembly illustrations, and exploded views.
Engine Type:
Single-cylinder, four-stroke (typical for this class).
Displacement:
Approximately 125cc (as indicated by model name).
Cooling System:
Likely Air-cooled (common for Hyosung 125cc models of this era).
Horsepower Range:
Estimated 10-15 HP (typical for 125cc sport/standard bikes of the late 90s).
Torque Figure:
Not specified, but will be detailed within the manual.
Carburetor Type:
Likely Mikuni or Keihin single carburetor, Constant Velocity (CV) type.
Fuel Delivery:
Gravity feed from fuel tank via fuel lines to carburetor.
Ignition System:
CDI (Capacitor Discharge Ignition) with electronic advance.
Lubrication System:
Wet sump lubrication.
Overall Length:
Not specified, detailed in manual.
Overall Width:
Not specified, detailed in manual.
Overall Height:
Not specified, detailed in manual.
Dry Weight:
Typically around 110-130 kg for 125cc sport bikes of this era.
Wet Weight:
Not specified, detailed in manual.
Oil Change Interval:
Typically every 3,000-5,000 km or 6-12 months, consult manual for exact figures.
Spark Plug Replacement:
Every 6,000-10,000 km, consult manual for specific plug type and gap.
Chain Lubrication:
Every 500-1,000 km, and before long rides.
Engine Oil Type:
Likely 10W-40 or 20W-50, API SG/SH or higher. Specific viscosity and API rating detailed in manual.
Engine Oil Capacity:
Approximately 1.0 - 1.5 liters (including oil filter change), exact capacity in manual.
Brake Fluid Type:
DOT 3 or DOT 4 (check manual for specific requirement).
Carburetor Cleaning:
Carburetors can become gummed up if fuel sits for extended periods, requiring regular cleaning and potentially jet replacement.
Electrical Connections:
Corrosion in electrical connectors is a common issue on older motorcycles, requiring inspection and cleaning.
Fork Seals:
Front fork seal leaks can occur with age and mileage, requiring replacement.