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Hyosung GF125 Factory Service Repair Manual

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🏷️ Basic Information Identification Make: Hyosung Model: GF125 👋 Introduction Market Position Market Segment: Entry-level to mid-range sport-style motorcycle, popular for commuting and light recreational use. Competitive Analysis Competitors: Competes...
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Hyosung GF125 Factory Service Repair ManualHyosung GF125 Factory Service Repair ManualHyosung GF125 Factory Service Repair Manual
🏷️ Basic Information
Identification
Make:
Hyosung
Model:
GF125
👋 Introduction
Market Position
Market Segment:
Entry-level to mid-range sport-style motorcycle, popular for commuting and light recreational use.
Competitive Analysis
Competitors:
Competes with similar 125cc sport bikes from brands like Yamaha (YZF-R125), Honda (CBR125R), and Kawasaki (Ninja 125).
Key Features
Unique Selling Points:
Offers a sporty aesthetic and accessible performance, often at a competitive price point. Hyosung's focus on value and robust engineering.
Target Audience
Target Demographic:
New riders, commuters, and budget-conscious enthusiasts seeking a stylish and functional motorcycle.
📋 Manual Details
Coverage Areas
Manual Type:
Factory Service Repair Manual
Language:
English
Page Count
Page Count:
Information not specified in product description. Typical factory service manuals for this class of motorcycle can range from 200-500 pages.
Format
Format:
Likely digital (PDF) for accessibility, though physical copies may exist.
📖 Manual Coverage
Systems Covered
Engine Mechanical:
Disassembly, assembly, inspection, and repair of engine components (cylinder, piston, crankshaft, camshaft, valves, etc.).
Fuel System:
Carburetor tuning, cleaning, and overhaul; fuel tank, fuel lines, and fuel pump inspection.
Ignition System:
Spark plug inspection and replacement, ignition coil testing, CDI unit troubleshooting.
Lubrication System:
Oil pump inspection, oil filter replacement, oil change procedures, oil specifications.
Cooling System:
Coolant specifications, radiator inspection, fan operation check (if applicable).
Exhaust System:
Muffler and exhaust pipe inspection, gasket replacement.
Transmission Gearbox:
Clutch operation, gear shifting mechanism inspection and adjustment, transmission fluid change.
Chassis Frame:
Frame inspection for damage, steering head bearing adjustment and replacement.
Suspension Front:
Front fork disassembly, assembly, oil change, seal replacement, spring inspection.
Suspension Rear:
Rear shock absorber inspection, linkage lubrication, adjustment procedures.
Wheels Tires:
Wheel bearing inspection and replacement, tire pressure recommendations, rim runout checks.
Brakes Front:
Brake caliper disassembly and service, brake pad replacement, brake fluid specifications and bleeding procedure, rotor inspection.
Brakes Rear:
Brake drum inspection and cleaning, brake shoe replacement, linkage lubrication.
Electrical System Lighting:
Headlight, taillight, turn signal bulb replacement and troubleshooting, wiring harness inspection.
Electrical System Charging:
Stator, rectifier/regulator testing, battery maintenance and charging.
Electrical System Starting:
Starter motor inspection and testing, starter relay troubleshooting.
Bodywork Fittings:
Fairing removal and installation, seat adjustment, tank cover removal.
Procedures Included
Routine Maintenance:
Oil changes, filter replacements, chain adjustment and lubrication, brake adjustments, tire pressure checks, battery maintenance.
Troubleshooting:
Diagnostic charts for common starting, running, and electrical issues, pinpointing faults.
Disassembly Assembly:
Step-by-step instructions for removing and reinstalling major components and sub-assemblies.
Engine Rebuild:
Detailed procedures for engine overhaul, including specifications for wear limits and clearances.
Brake System Service:
Complete guide to brake pad replacement, caliper service, bleeding, and fluid flushing.
Suspension Overhaul:
Procedures for fork seal replacement, fork oil changes, and rear shock maintenance.
Electrical Diagnostics:
Testing procedures for ignition, charging, and lighting systems.
Carburetor Adjustment:
Idle speed, mixture, and jetting adjustments for optimal performance.
Technical Depth
Depth Level:
Comprehensive, covering from basic maintenance to full engine and component overhaul.
Detail Level:
Includes detailed diagrams, torque specifications, clearance measurements, and diagnostic flowcharts.
📊 Manual Specifications
File Format
File Format:
Typically PDF, enabling searchability and easy printing of specific sections.
Print Quality
Print Quality:
Digital files are high-resolution, ensuring clear diagrams and text. Printed versions depend on original factory output.
Binding Type
Binding Type:
If physical, likely spiral-bound or perfect-bound for lay-flat usability in a workshop.
Paper Type
Paper Type:
Original factory manuals often use durable, coated paper to withstand workshop environments. Digital PDFs offer consistent clarity.
⚙️ Engine Specifications
Primary Engine
Engine Type:
Liquid-cooled, four-stroke, single-cylinder, DOHC
Displacement:
Approximately 124.7 cc
Bore X Stroke:
Typical specifications for this class: ~54.0 mm x 54.5 mm (exact values require manual verification)
Performance
Horsepower:
Around 13-15 HP (exact figures vary by market and specific model year, requires manual verification)
Torque:
Approximate torque figures are typically in the 9-11 Nm range (requires manual verification)
Fuel System
Fuel Delivery:
Carburetor (Mikuni VM series or similar, specific model may vary)
Fuel Type:
Unleaded gasoline, 91 octane or higher recommended.
Ignition
Ignition System:
CDI (Capacitor Discharge Ignition), electric start.
Lubrication
Oil Capacity:
Approximately 1.0 - 1.2 liters (requires manual verification for exact capacity and type).
🔧 Transmission
Standard
Transmission Type:
Constant mesh, 6-speed sequential manual gearbox.
Optional
Optional Transmissions:
Not applicable for this model; typically single transmission option.
Features
Clutch Type:
Wet, multi-plate clutch, operated by cable.
Final Drive:
Chain drive.
Gear Ratios
Gear Ratios:
Specific gear ratios are detailed within the manual and critical for performance tuning.
📐 Dimensions
Exterior
Length:
Approx. 2050 mm (requires manual verification)
Width:
Approx. 750 mm (requires manual verification)
Height:
Approx. 1110 mm (requires manual verification)
Wheelbase:
Approx. 1370 mm (requires manual verification)
Weights
Dry Weight:
Approx. 140-150 kg (requires manual verification)
Curb Weight:
Approximately 150-160 kg (requires manual verification)
Fuel Tank Capacity:
Approx. 14-16 liters (requires manual verification)
🛡️ Safety Features
Ratings
Safety Standards:
Designed to meet relevant national and international motorcycle safety standards. Specific ratings like Euro NCAP are not applicable to motorcycles.
Active Features
Active Safety Features:
Responsive braking system, stable chassis geometry, good tire adhesion.
Passive Features
Passive Safety Features:
Reinforced frame, protective bodywork fairings, ergonomic riding position.
Lighting
Lighting Type:
Halogen headlight, LED taillight and indicators (model dependent), ensuring visibility.
💡 Technology Features
Infotainment
Instrument Cluster:
Analog tachometer, digital speedometer, odometer, trip meter, fuel gauge, and indicator lights. Specific layout varies by model year.
Driver Assistance
Driver Assistance Systems:
Not applicable in the traditional automotive sense. Focus is on rider control and feedback.
Connectivity
Connectivity Features:
No advanced connectivity features like Bluetooth or smartphone integration.
🔧 Maintenance
Service Intervals
Oil Change Interval:
Typically every 3,000-5,000 km or 6-12 months, whichever comes first. Specific interval in manual.
Air Filter Cleaning:
Recommended every 6,000 km, replacement every 12,000 km or as needed. Manual will specify.
Spark Plug Replacement:
Typically every 10,000-15,000 km, dependent on plug type. Manual will specify.
Valve Clearance Check:
Recommended at initial service and then every 10,000-15,000 km. Manual is essential for correct procedure and specs.
Fluid Specifications
Engine Oil Type:
JASO MA, API SG or higher, SAE 10W-40 or 20W-50. Verify with manual for precise recommendation.
Coolant Type:
Ethylene glycol-based antifreeze with distilled water (50/50 mix). Refer to manual for specific type and capacity.
Brake Fluid Type:
DOT 3 or DOT 4 hydraulic brake fluid. Manual will specify exact requirement.
Known Issues
Common Wear Items:
Brake pads, tires, chain and sprockets, clutch plates, fork seals are typical wear items.
Potential Quirks:
Some users report occasional electrical gremlins or carburetor tuning sensitivity; the manual is key for diagnosing these.
Recommended Tools
Special Tools:
Specific tools for valve adjustment, fork disassembly, and engine timing may be required. Manual will list these.
📚 Vehicle History
Brand Heritage
Manufacturer:
Hyosung (now S&T Motors, then Kymco-owned) is a South Korean manufacturer known for producing a range of motorcycles, scooters, and ATVs.
Model Evolution
Production Start:
The GF125 model has been in production for several years, with updates and minor revisions throughout its lifecycle. Exact introduction year varies by market.
Production
Manufacturing Location:
Primarily manufactured in South Korea.
Reputation
Market Perception:
Hyosung motorcycles are often perceived as offering good value for money, combining sporty styling with reliable performance, particularly in the smaller displacement categories.
🏆 Awards & Recognition
Recognitions
Industry Awards:
While Hyosung models are generally well-regarded for their value proposition, specific industry awards for the GF125 are not widely documented.
Ratings
User Satisfaction:
User satisfaction often centers on its affordability and sporty styling for its class. Maintenance and repair support are crucial factors.
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