🏷️ Basic Information

Make:

Hyosung

Model:

GF125

👋 Introduction

Market Position:

The Hyosung GF125 is positioned as an entry-level to mid-range commuter motorcycle, appealing to riders seeking a balance of performance, reliability, and affordability. It competes in the 125cc naked sportbike segment.

Competitive Analysis:

Key competitors for the GF125 typically include models from brands like Honda (CB125F), Yamaha (MT-125), Suzuki (GSX-S125), and KTM (125 Duke), offering similar engine displacements and street-oriented designs.

Key Features:

The GF125 typically features a single-cylinder engine, disc brakes front and rear, a capable suspension system for urban riding, and a sporty aesthetic. This service manual provides comprehensive support for maintaining and repairing these features.

📋 Manual Details

Coverage Areas:

Periodic Maintenance, Tune-Up Procedures, Engine Servicing, Fuel and Lubrication System, Electrical System, Chassis Servicing, General Information

Page Count:

Not Specified

Manual Type:

Service Manual / Repair Manual

Language:

English

Format:

PDF

📖 Manual Coverage

Systems Covered:

Engine (internals, cooling, exhaust), Fuel System (carburetor, fuel lines, filters), Lubrication System (oil pump, oil passages), Electrical System (ignition, starting, charging, lighting, wiring diagrams), Chassis (frame, suspension, steering, wheels, brakes, body components)

Procedures Included:

Routine maintenance checks and adjustments, engine disassembly and reassembly, carburetor tuning and overhaul, ignition system diagnosis and repair, charging system testing, brake system servicing, suspension and steering component inspection and replacement, troubleshooting guides for common problems.

Technical Depth:

Comprehensive coverage for diagnostics, repair, and overhaul of all major vehicle systems. Includes detailed step-by-step instructions, exploded views, and technical specifications required for professional servicing.

📊 Manual Specifications

File Format:

Portable Document Format (PDF)

Print Quality:

High-resolution digital document, optimized for on-screen viewing and printing.

Binding Type:

N/A (Digital Download)

Paper Type:

N/A (Digital Download)

⚙️ Engine Specifications

Primary Engine:

Single-cylinder, four-stroke, air-cooled

Displacement:

Approximately 124cc (specific bore and stroke may vary by exact model year)

Horsepower:

Typically in the range of 10-15 HP at around 9,000-10,000 RPM (specific output depends on tuning and emission standards)

Torque:

Torque figures are generally modest for this displacement class, providing adequate acceleration for city commuting.

Fuel System:

Carbureted (specific carburetor model and jetting detailed in manual)

Cooling System:

Air-cooled

🔧 Transmission

Transmission Type:

Manual, 5-speed constant mesh

Optional Transmission:

N/A

Clutch Type:

Wet multi-plate clutch

Gear Ratios:

Detailed gear ratios for each speed are provided within the manual.

Final Drive:

Chain drive

📐 Dimensions

Overall Length:

Approximate: 2000 mm (varies by year)

Overall Width:

Approximate: 750 mm (varies by year)

Overall Height:

Approximate: 1050 mm (varies by year)

Dry Weight:

Approximate: 130-140 kg (varies by year and specific components)

Gross Vehicle Weight Rating:

Recommended GVWR detailed in manual

Front Tire Size:

e.g., 90/90-17 (specifics in manual)

Rear Tire Size:

e.g., 110/80-17 (specifics in manual)

Wheelbase:

Approximate: 1350 mm (varies by year)

🛡️ Safety Features

Safety Ratings:

Motorcycle safety ratings are typically not standardized in the same way as automobiles. Focus is on mechanical integrity and rider control.

Braking System Front:

Hydraulic disc brake (specific caliper type and rotor size detailed in manual)

Braking System Rear:

Hydraulic disc brake (specific caliper type and rotor size detailed in manual)

Frame Construction:

Steel diamond frame (structural integrity and inspection procedures in manual)

💡 Technology Features

Infotainment System:

Basic analog/digital instrument cluster displaying speed, RPM, odometer, trip meter, and indicator lights. No advanced infotainment features.

Driver Assistance Features:

N/A (No electronic rider aids like ABS or traction control typically found on this model).

Lighting System:

Halogen headlight, LED or incandescent taillight and turn signals. Manual covers bulb types and electrical system diagnostics.

🔧 Maintenance

Oil Change Interval:

Typically every 3,000 km or 6 months, whichever comes first (refer to manual for precise interval and oil type).

Spark Plug Replacement:

Recommended replacement interval around 6,000-10,000 km (specific spark plug type and gap in manual).

Air Filter Cleaning Replacement:

Check/clean every 3,000 km, replace as needed (specific filter part number in manual).

Valve Clearance Adjustment:

Recommended at specific mileage intervals (e.g., 6,000 km), detailed procedure and specifications in manual.

Engine Oil Type:

API SG/SH/SJ or higher, SAE 10W-40 or 20W-50 (confirm with manual for exact specification and viscosity range based on climate).

Engine Oil Capacity:

Approximate: 1.0-1.2 Liters (check dipstick/sight glass and manual for precise capacity).

Brake Fluid Type:

DOT 3 or DOT 4 (refer to manual for specific type for front and rear systems).

Coolant Type:

N/A (Air-cooled engine)

Transmission Oil Type:

Likely a dedicated motorcycle gear oil or the same engine oil. Manual will specify.

Known Issues:

Common issues in this class of motorcycle can include carburetor tuning sensitivity, occasional electrical gremlins if not maintained, chain and sprocket wear, and brake pad replacement. The manual provides solutions for these and more.

📚 Vehicle History

Brand Heritage:

Hyosung (now S&T Motors) is a South Korean manufacturer known for producing a range of motorcycles, from smaller displacement commuter bikes to larger cruisers and sportbikes. They have a history of manufacturing for other brands as well.

Model Evolution:

The GF125 represents Hyosung's offering in the competitive 125cc sport-naked segment, evolving with minor updates in styling and componentry over its production run to meet market demands and regulatory standards.

Production Years:

Production years are not explicitly stated in product information, but it has been a model offered in various markets over the past decade. Manual will cover applicable model years.

Manufacturing Location:

South Korea

🏆 Awards & Recognition

Recognitions:

No prominent industry awards are typically associated with this specific model, as it focuses on core functionality and affordability.