Target Audience:
Owners of the Hyosung GF125 seeking to perform maintenance, repairs, and diagnostics themselves or to better understand their vehicle.
Value Proposition:
Provides factory-level repair information, saving significant costs compared to dealership service.
Completeness:
100% complete and intact, covering all aspects of the GF125.
Usability:
Designed for both novice DIYers and experienced mechanics with clear, step-by-step instructions.
Accessibility:
Compatible with all PC-based Windows operating systems and Mac.
Engine:
Detailed engine assembly, disassembly, overhaul, tuning, and troubleshooting.
Transmission:
Clutch, gearbox, and final drive inspection, repair, and adjustment.
Fuel System:
Carburetor(s) disassembly, cleaning, adjustment, and troubleshooting. Fuel tank and lines inspection.
Electrical System:
Ignition system, charging system (stator, regulator/rectifier), lighting, starting system, and battery maintenance.
Chassis And Suspension:
Front forks (telescopic), rear shock absorber, swingarm, bearings, and wheel hub maintenance and repair.
Braking System:
Front and rear brake systems (likely disc brakes), including caliper, master cylinder, brake lines, and pad replacement.
Cooling System:
Air-cooled engine specifications and maintenance (if applicable, though GF125 is typically air-cooled).
Exhaust System:
Exhaust pipe and muffler inspection and replacement.
Bodywork And Trim:
Panel removal, installation, and common repairs.
Maintenance:
Routine maintenance, scheduled servicing, oil changes, filter replacements, chain adjustment, spark plug service.
Troubleshooting:
Diagnostic procedures for common issues, fault finding guides based on symptoms.
Repair:
Detailed step-by-step instructions for component disassembly, reassembly, and repair.
Rebuilding:
Complete engine rebuild procedures, including torque specifications and clearances.
Adjustment:
Carburetor synchronization, idle speed adjustment, brake lever free play, clutch lever free play.
Replacement:
Component replacement procedures for all major systems.
Depth:
In-depth, factory-level detail suitable for both novice DIY enthusiasts and experienced mechanics.
Illustrations:
Hundreds of photos and detailed illustrations guiding through each procedure.
Disassembly Level:
Based on complete disassembly of the machine.
Readability:
Searchable text within PDF for quick information retrieval.
Printability:
All pages are printable, allowing for physical copies during repairs.
Type:
Digital download (PDF format)
Digital Format:
PDF (Portable Document Format)
Engine Type:
Air-cooled, 4-stroke, single-cylinder (typical for GF125, specific configuration confirmed in manual)
Displacement:
124.5 cc (exact specification will be detailed in the manual)
Bore X Stroke:
Specifications provided in manual
Compression Ratio:
Specifications provided in manual
Horsepower:
Specifications provided in manual
Torque:
Specifications provided in manual
Fuel Delivery:
Carburetor (likely Keihin or similar Japanese brand, specific model in manual)
Fuel Type:
Unleaded gasoline (specification detailed in manual)
Oil Type:
Specific motorcycle engine oil grade and API specification provided in manual
Oil Capacity:
Exact oil capacity in liters/quarts will be detailed in the manual
Type:
Manual transmission
Gear Ratios:
Detailed gear ratios for each speed will be listed in the manual
Clutch Type:
Wet multi-plate clutch (typical for this class of motorcycle, manual will confirm)
Final Drive:
Chain drive (specification and maintenance procedures in manual)
Transmission Fluid:
Specifications for gearbox oil or if it shares engine oil will be provided.
Length:
Specifications provided in manual
Width:
Specifications provided in manual
Height:
Specifications provided in manual
Dry Weight:
Specifications provided in manual
Curb Weight:
Specifications provided in manual
Max Load Capacity:
Specifications provided in manual
Front Tire Size:
Specifications provided in manual (e.g., 100/80-17)
Rear Tire Size:
Specifications provided in manual (e.g., 130/70-17)
Wheel Type:
Alloy or Spoked (confirmation in manual)
Braking System Type:
Front disc brake, Rear disc brake (standard configuration for GF125, specific details in manual)
Lighting:
Headlight, taillight, brake lights, turn signals (electrical section covers maintenance)
Frame Construction:
Steel frame (details on inspection and repair in manual)
Instrument Cluster:
Analog or Digital instrument cluster with speedometer, tachometer, odometer, and indicator lights. (Details on inspection and maintenance of cluster components in manual).
ABS:
Anti-lock Braking System (ABS) is not a standard feature on most GF125 models; manual will confirm if an ABS variant exists.
Usb Charging:
Unlikely to be a standard feature on this model, but the manual covers electrical system modifications.
Oil Change Interval:
Specific mileage or time interval for engine oil changes will be detailed in the manual, typically every 2,000-3,000 km or 6 months.
Air Filter Cleaning:
Recommended interval for inspection and cleaning/replacement of the air filter will be provided.
Spark Plug Service:
Interval for spark plug inspection, cleaning, and replacement, including gap specification.
Chain Maintenance:
Schedule for chain lubrication and tension adjustment.
Engine Oil Grade:
Specific SAE viscosity grade (e.g., 10W-40) and API service classification (e.g., SG, SH, SJ) will be in the manual.
Brake Fluid Type:
DOT 3 or DOT 4 brake fluid specification for hydraulic systems will be detailed.
Common Problems:
The manual will likely address common issues such as carburetor tuning sensitivities, electrical connection integrity, and wear on consumables like brake pads and tires. Specific common faults will be detailed in the troubleshooting section.
Manufacturer:
Hyosung (Korean manufacturer with a history in motorcycles and industrial equipment).
Gf125 Positioning:
The GF125 was positioned as an entry-level naked sportbike, offering accessible performance and styling.
Production Period:
Specific production years for the GF125 are not explicitly stated but it was a model produced within Hyosung's typical model cycles, likely spanning the late 2000s to early 2010s.
