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HYOSUNG GF125 Full Service & Repair Manual

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This manual covers the GF125, a versatile motorcycle produced primarily in the early to mid-2000s. Designed for accessible sport and naked riding, the GF125 features a reliable single-cylinder, 4-stroke, air-cooled...
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HYOSUNG GF125 Full Service & Repair Manual
This manual covers the GF125, a versatile motorcycle produced primarily in the early to mid-2000s. Designed for accessible sport and naked riding, the GF125 features a reliable single-cylinder, 4-stroke, air-cooled engine with a displacement of 124.6 cc. Its engineering emphasizes practicality and ease of use, making it a suitable choice for both new riders and those seeking an economical urban commuter. The GF125 is equipped with a 5-speed constant mesh transmission, wet multi-plate clutch, and chain drive, offering a responsive and engaging riding experience. This comprehensive English-language workshop manual provides all necessary repair, servicing, and troubleshooting procedures for the GF125. It details maintenance tasks, component overhauls, and adjustments for critical systems including the engine, fuel system, ignition, transmission, suspension, brakes, and electrical system. With hundreds of detailed photos and diagrams, this manual serves as an indispensable resource for DIY enthusiasts, independent repair shops, and technicians, enabling efficient and accurate maintenance and repair of the GF125.
🏷️ Basic Information
Identification
Make:
Hyosung
Model:
GF125
Product Type:
Full Service & Repair Workshop Manual
👋 Introduction
Market Position
Target Audience:
DIY enthusiasts, independent repair shops, and Hyosung GF125 owners.
Competitive Analysis
Value Proposition:
Provides factory-level technical information at a fraction of dealership costs, with lifelong access.
Key Features
Access:
Instant download, multi-device compatibility (Windows & MAC).
Cost Model:
One-time purchase, no recurring fees or subscriptions.
Content Quality:
Professional-grade, detailed step-by-step instructions and visual aids.
📋 Manual Details
Coverage Areas
Primary Coverage:
All repair, servicing, and troubleshooting procedures for the Hyosung GF125.
Page Count
Estimated Pages:
Hundreds
Manual Type
Type:
Factory Service Repair Workshop Manual
Language
Language:
English
Format
Format:
Digital Download (PDF)
📖 Manual Coverage
Systems Covered
Engine:
Detailed diagnosis, repair, and overhaul of the engine and its components.
Fuel System:
Carburetor adjustment, cleaning, and troubleshooting.
Ignition System:
Spark plug diagnosis, timing, and component testing.
Transmission:
Clutch adjustment, gear shifting mechanisms, and internal inspection.
Suspension:
Front fork service, rear shock absorber replacement, and linkage maintenance.
Brakes:
Brake fluid replacement, caliper service, brake pad renewal, and bleeding procedures.
Electrical System:
Wiring diagrams, battery testing, lighting system maintenance, starter and charging system troubleshooting.
Cooling System:
Radiator and coolant service (if applicable to GF125, typically air-cooled but manual may cover related systems).
Chassis And Frame:
Frame inspection, steering head bearing service, and general chassis component maintenance.
Bodywork:
Panel removal and installation, fairings, and general body maintenance.
Procedures Included
Maintenance:
Scheduled maintenance tasks, oil changes, filter replacements, lubrication.
Troubleshooting:
Systematic diagnostic procedures for common and uncommon issues.
Repair:
Step-by-step instructions for component replacement and repair.
Overhaul:
Complete engine and transmission rebuild procedures.
Adjustment:
Carburetor, clutch, brake, and throttle cable adjustments.
Installation:
Component installation procedures, including specialized parts.
Technical Depth
Depth:
Comprehensive, covering basic to advanced repair and diagnostic tasks.
Visual Aids:
Hundreds of detailed photos and diagrams, including exploded views.
📊 Manual Specifications
File Format
Format:
PDF
Searchable:
Implied by professional manual standards, likely text-searchable.
Print Quality
Printability:
Printable (single pages or entire manual).
Resolution:
High-resolution for clarity of photos and diagrams.
Binding Type
Binding:
N/A (Digital Download)
Paper Type
Paper Type:
N/A (Digital Download)
Licensing
Usage Rights:
Unlimited use on multiple devices, no expiry.
⚙️ Engine Specifications
Primary Engine
Configuration:
Single-cylinder, 4-stroke
Displacement:
124.6 cc (This is a common displacement for 125cc motorcycles, specific to GF125 is implied)
Cooling System:
Air-cooled (typical for this class and era of Hyosung)
Performance
Horsepower:
Approx. 12-14 HP (typical range for a 125cc air-cooled engine of this type)
Torque:
Approx. 9-10 Nm (typical range)
Fuel System
Carburetion:
Mikuni VM series or similar carburetor (common for Korean motorcycles of this era, specific model will be in manual).
Fuel Type:
Unleaded gasoline
Engine Oil
Recommendation:
10W-40 or 20W-50 motorcycle specific oil (as specified in manual).
Capacity:
Approx. 1.0 - 1.2 Liters (check manual for exact capacity).
🔧 Transmission
Standard
Type:
5-speed constant mesh
Optional
Optional Types:
N/A
Features
Clutch Type:
Wet multi-plate
Final Drive:
Chain drive
📐 Dimensions
Exterior
Length:
Specific dimensions would be detailed in the manual, typical for a 125cc sport/naked bike.
Width:
Specific dimensions would be detailed in the manual.
Height:
Specific dimensions would be detailed in the manual.
Weights
Dry Weight:
Approx. 130-140 kg (typical for this class)
Curb Weight:
Will be specified in manual, includes fluids and full tank.
Wheels And Tires
Front Tire Size:
e.g., 100/80-17 (specific to GF125 in manual)
Rear Tire Size:
e.g., 130/70-17 (specific to GF125 in manual)
Wheel Type:
Alloy wheels
🛡️ Safety Features
Ratings
Crash Test Results:
N/A (Motorcycle specific crash testing is not standardized in the same way as cars).
Active Features
Braking System:
Disc brakes front and rear (typical).
Passive Features
Lighting:
Halogen headlight, LED taillight (common)
💡 Technology Features
Infotainment
Features:
Basic analog instrumentation (speedometer, tachometer, odometer, fuel gauge if present).
Driver Assistance
Features:
N/A (No electronic driver assistance systems typical for this model).
Connectivity
Features:
N/A
🔧 Maintenance
Service Intervals
Oil Change:
Every 3,000-5,000 km or 6 months (typical for this engine type, specific interval in manual).
Air Filter:
Clean every 6,000 km, replace as needed (refer to manual).
Spark Plug:
Inspect every 6,000 km, replace as needed (refer to manual for specific type and gap).
Valve Clearance:
Inspect every 12,000 km (typical for 4-stroke engines, specific interval in manual).
Fluid Specifications
Brake Fluid:
DOT 3 or DOT 4 (check manual for exact specification).
Coolant:
N/A (likely air-cooled, but manual might cover associated systems).
Fork Oil:
Specific viscosity and quantity will be detailed in the manual.
Known Issues
Carburetor Issues:
Potential for clogging or maladjustment over time, requiring cleaning and tuning.
Electrical Gremlins:
As with many motorcycles of this era, intermittent electrical issues or connection problems can occur.
Carb Jetting:
May require re-jetting if exhaust or airbox modifications are made.
📚 Vehicle History
Brand Heritage
Manufacturer:
Hyosung Motors & Machinery Inc. (South Korea)
Model Evolution
Model Line:
The GF series represents Hyosung's line of accessible sport and naked motorcycles.
Production
Production Years:
The GF125 was produced primarily in the early to mid-2000s, specific years would be covered if in manual.
Manufacturing Location:
South Korea
🏆 Awards & Recognition
Recognitions
Certifications:
Manual adheres to industry-standard repair documentation practices.
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