Vehicle Class:
The Hyosung GF125 is typically positioned as an entry-level to mid-range sport motorcycle, popular for commuting, light touring, and general recreational riding, often appealing to new riders or those seeking an economical option.
Competitors:
Competes with similar 125cc sport bikes from manufacturers such as Yamaha (YZF-R125), Honda (CBR125R), Kawasaki (Ninja 125), and other regional brands offering comparable displacement and styling.
Manual Value Proposition:
Provides factory-level technical information, enabling owners and technicians to perform comprehensive maintenance and repairs, maximizing vehicle longevity and performance.
Systems Covered:
Engine mechanical, fuel system, ignition system, lubrication, cooling system, transmission, clutch, chassis, suspension, braking system, electrical system, wiring diagrams, bodywork, troubleshooting, maintenance.
Estimated Page Count:
Likely between 200-500 pages based on typical factory service manuals for this vehicle class.
Manual Type:
Factory Service Repair Manual
Engine Mechanical:
Detailed disassembly, inspection, and reassembly procedures for all engine components including cylinder head, pistons, crankshaft, camshaft, valves, and timing system.
Fuel System:
Carburetor adjustment and overhaul, fuel pump operation (if applicable), fuel tank and lines inspection and maintenance.
Ignition System:
Spark plug specifications, ignition timing, CDI unit troubleshooting, coil testing, and related wiring.
Lubrication System:
Oil pump inspection, oil filter replacement, oil change intervals, and oil pressure checks.
Cooling System:
Radiator maintenance, coolant specifications and capacity, water pump inspection, thermostat operation.
Transmission Clutch:
Gearbox inspection and repair, clutch adjustment, clutch plate wear limits, and lubrication.
Chassis Suspension:
Frame inspection, front fork disassembly and servicing, rear shock absorber replacement, swingarm pivot maintenance.
Braking System:
Brake pad replacement, brake fluid specifications and bleeding procedures, caliper and master cylinder service, drum brake adjustment.
Electrical System:
Battery testing and maintenance, charging system (stator, rectifier/regulator), starter motor operation, lighting system, horn, and indicators.
Wiring Diagrams:
Comprehensive and color-coded wiring diagrams for the entire vehicle, illustrating all circuits and component connections.
Maintenance Procedures:
Routine maintenance tasks such as oil changes, filter replacements, spark plug checks, chain adjustment, tire pressure checks, and brake inspections.
Repair Procedures:
Step-by-step instructions for component disassembly, repair, and reassembly for virtually all vehicle systems.
Troubleshooting Guides:
Systematic diagnostic charts and procedures to identify and resolve common and uncommon issues, with symptoms and corrective actions.
Assembly Disassembly:
Detailed visual guidance (hundreds of photos) for taking apart and putting back together various vehicle components.
Diagnostic Capabilities:
Covers basic to intermediate diagnostic procedures, including component testing with specifications and troubleshooting flowcharts.
Rebuild Procedures:
Provides guidance for complete engine, transmission, and suspension rebuilds with torque specifications and clearances.
File Format Details:
Portable Document Format (PDF) optimized for digital viewing and printing.
Print Quality:
High quality, suitable for printing individual pages or the entire manual.
Binding Type Description:
Digital format (PDF), not physically bound. Recommended to print and bind according to user preference.
Recommended Paper Type:
Standard printer paper (20-24 lb bond) is suitable for printing.
Engine Type:
Single-cylinder, four-stroke (typical configuration for this model range).
Displacement:
125cc (approximately).
Cooling System:
Liquid-cooled (most common for this class to manage heat effectively).
Horsepower Output:
Typically in the range of 13-15 HP, depending on specific market tuning and regulations.
Torque Output:
Torque figures would be detailed in the manual, generally optimized for low to mid-range usability.
Fuel Delivery:
Carburetor (likely a Keihin or similar brand, specific model detailed in manual).
Fuel Type:
Unleaded gasoline, specified octane rating in manual.
Overall Length:
Specific dimensions will be in the manual, typical for a 125cc sportbike.
Overall Width:
Specific dimensions will be in the manual.
Overall Height:
Specific dimensions will be in the manual.
Dry Weight:
Refer to manual for exact specification, typically around 130-150 kg.
Wet Weight:
Refer to manual for exact specification, including all fluids.
Safety Standards:
Compliance with relevant national and international motorcycle safety standards.
Braking System Type:
Front: Disc brake; Rear: Disc brake (common configuration). ABS may be optional or absent depending on the market and year.
Lighting:
Halogen headlight, LED taillight and turn signals (depending on specific revision).
Frame Construction:
Robust frame design for stability and rider confidence.
Instrument Cluster:
Analog tachometer and speedometer, fuel gauge, indicator lights for turn signals, high beam, neutral, and oil pressure (specific features vary by year).
ABS Availability:
ABS was not standard on early models and may be an optional feature on later revisions or specific market variants. Manual will detail braking system regardless.
Connectivity Features:
No advanced connectivity features like Bluetooth or smartphone integration typically found on this model.
Oil Change Interval:
Typically every 3,000-5,000 km or 6-12 months, with specific intervals detailed in the manual.
Spark Plug Replacement:
Refer to manual; usually around 10,000-15,000 km.
Chain Lubrication Adjustment:
Recommended every 500-1000 km and after washing or riding in rain.
Engine Oil Type:
API SG, SF, or higher; SAE 10W-40 or 20W-50 motorcycle-specific oil (check manual for exact viscosity and API classification).
Coolant Type:
Ethylene glycol-based permanent antifreeze coolant, 50/50 mix with distilled water (verify specification in manual).
Brake Fluid Type:
DOT 4 or DOT 5.1 (verify in manual).
Common Wear Items:
Clutch plates, brake pads, chain and sprockets, spark plugs, and tires are common wear items. Carburetor tuning may require periodic adjustment.
Electrical Concerns:
Battery terminal corrosion, rectifier/regulator failure, and loose connections can be potential issues, all covered in diagnostic sections.
Hyosung History:
Hyosung is a South Korean manufacturer known for producing a range of motorcycles, scooters, and ATVs, often recognized for offering competitive value.
Gf125 Lineage:
The GF125 is part of Hyosung's sportbike lineup, designed to provide accessible performance and styling in the 125cc segment.
Production Years:
The GF125 has been produced across various years; this manual likely covers a specific range or generation, typically from the early 2000s onwards.
