This complete workshop service repair manual for the 2002-2010 Hyosung Comet GT125 covers every aspect of maintenance and repair, from engine overhaul to electrical diagnostics. Includes detailed torque specifications, exploded diagrams, wiring schematics, and step-by-step procedures that match Hyosung factory dealership documentation. Perfect for owners performing their own maintenance or mechanics servicing this sporty lightweight motorcycle.
2002-2010 Hyosung Comet GT125 Service Repair Workshop Manual PDF
VEHICLE/EQUIPMENT INTRODUCTION:
The Hyosung Comet GT125 was introduced in the early 2000s as part of the South Korean manufacturer Hyosung Motor's push into the global sport motorcycle market. Styled as a quarter-faireing sport bike, the GT125 was designed to give riders the aggressive looks of larger supersport machines in a manageable 125cc package. Hyosung, originally founded in 1978 as a motorcycle and light vehicle producer, partnered with Suzuki technology for many of their early engine designs. The Comet GT125 shares its platform architecture with the larger GT250 and GT650 models, featuring a twin-spar steel frame, a liquid-cooled V-twin engine in higher displacements, and sporty geometry. For the 125cc variant, a single-cylinder four-stroke engine delivers accessible performance ideal for new riders, commuters, and learners restricted to lower displacement categories. Produced from 2002 through 2010, the GT125 earned a following for its value-oriented pricing, distinctive styling, and relatively affordable maintenance.
SERVICE AND REPAIR SCOPE:
- Hyosung GT125 2002-2010 General Information
- Hyosung GT125 Fuel system - carburetor jetting and cleaning
- Hyosung GT125 Cooling system - radiator, water pump, thermostat
- Hyosung GT125 Engine top end - cylinder head, valves, camshaft
- Hyosung GT125 Clutch - plate inspection, cable adjustment
- Hyosung GT125 Engine lubrication system - oil pump, filter, passages
- Hyosung GT125 Engine removal and installation
- Hyosung GT125 Crankshaft and transmission disassembly
- Hyosung GT125 Wheels and tires - bearing replacement, balancing
- Hyosung GT125 Final drive - sprockets and chain maintenance
- Hyosung GT125 Brakes - pad replacement, caliper rebuild, rotor inspection
- Hyosung GT125 Suspension - fork seal replacement, shock service
- Hyosung GT125 Steering - head bearing adjustment, triple clamp removal
- Hyosung GT125 Frame and bodywork
- Hyosung GT125 Electrical system - CDI, stator, regulator, wiring
- Valve clearance inspection and shim replacement procedures
- Carburetor synchronization and idle mixture adjustment
- Ignition timing verification and spark plug specifications
TECHNICAL SPECIFICATIONS:
- Manufacturer: Hyosung Motors
- Model: Comet GT125
- Years: 2002-2010
- Engine type: Single-cylinder, four-stroke, air or liquid-cooled (variant dependent)
- Displacement: approximately 125cc
- Transmission: 5 or 6-speed constant mesh
- Clutch: Wet multi-plate
- Frame: Steel twin-spar or perimeter
- Front suspension: Telescopic fork
- Rear suspension: Swingarm with monoshock
- Front brake: Single disc
- Rear brake: Drum or single disc depending on year
- Fuel capacity: approximately 15-17 liters
DIAGNOSTIC INFORMATION:
- Engine misfire or hesitation: inspect spark plug condition, clean carburetor jets, verify CDI signal to ignition coil
- Overheating: check coolant level, test thermostat opening temperature, inspect water pump impeller for wear
- Clutch slipping: measure friction plate thickness, check spring free length, adjust clutch cable free play
- Poor fuel economy: clean and adjust carburetor, inspect air filter element, verify choke operation
- Difficult shifting: drain and replace transmission oil, inspect shift forks and drum for wear, adjust clutch lever
- Fork oil leak: replace fork seals, inspect stanchion tubes for pitting or scoring
- No spark condition: test stator pickup coil resistance, check CDI unit output, inspect ignition coil primary and secondary windings
ILLUSTRATIONS AND DIAGRAMS INCLUDED:
- Engine exploded views with parts identification and torque values
- Carburetor cross-section diagrams showing jet and circuit layout
- Wiring harness full schematic with connector pin assignments
- Fork and shock absorber exploded assembly drawings
- Brake caliper piston and seal arrangement
- Frame geometry with torque point specifications
- Transmission gear pattern and dog engagement illustration
COMPATIBILITY:
- Hyosung Comet GT125 model years 2002-2010
- File format: Searchable PDF
FILE PROPERTIES:
- Format: Searchable PDF
- Language: English
- Delivery: Instant digital download
- Access: Download anytime after purchase
2002-2010 Hyosung Comet GT125 Service Repair Workshop Manual PDF
VEHICLE/EQUIPMENT INTRODUCTION:
The Hyosung Comet GT125 was introduced in the early 2000s as part of the South Korean manufacturer Hyosung Motor's push into the global sport motorcycle market. Styled as a quarter-faireing sport bike, the GT125 was designed to give riders the aggressive looks of larger supersport machines in a manageable 125cc package. Hyosung, originally founded in 1978 as a motorcycle and light vehicle producer, partnered with Suzuki technology for many of their early engine designs. The Comet GT125 shares its platform architecture with the larger GT250 and GT650 models, featuring a twin-spar steel frame, a liquid-cooled V-twin engine in higher displacements, and sporty geometry. For the 125cc variant, a single-cylinder four-stroke engine delivers accessible performance ideal for new riders, commuters, and learners restricted to lower displacement categories. Produced from 2002 through 2010, the GT125 earned a following for its value-oriented pricing, distinctive styling, and relatively affordable maintenance.
SERVICE AND REPAIR SCOPE:
- Hyosung GT125 2002-2010 General Information
- Hyosung GT125 Fuel system - carburetor jetting and cleaning
- Hyosung GT125 Cooling system - radiator, water pump, thermostat
- Hyosung GT125 Engine top end - cylinder head, valves, camshaft
- Hyosung GT125 Clutch - plate inspection, cable adjustment
- Hyosung GT125 Engine lubrication system - oil pump, filter, passages
- Hyosung GT125 Engine removal and installation
- Hyosung GT125 Crankshaft and transmission disassembly
- Hyosung GT125 Wheels and tires - bearing replacement, balancing
- Hyosung GT125 Final drive - sprockets and chain maintenance
- Hyosung GT125 Brakes - pad replacement, caliper rebuild, rotor inspection
- Hyosung GT125 Suspension - fork seal replacement, shock service
- Hyosung GT125 Steering - head bearing adjustment, triple clamp removal
- Hyosung GT125 Frame and bodywork
- Hyosung GT125 Electrical system - CDI, stator, regulator, wiring
- Valve clearance inspection and shim replacement procedures
- Carburetor synchronization and idle mixture adjustment
- Ignition timing verification and spark plug specifications
TECHNICAL SPECIFICATIONS:
- Manufacturer: Hyosung Motors
- Model: Comet GT125
- Years: 2002-2010
- Engine type: Single-cylinder, four-stroke, air or liquid-cooled (variant dependent)
- Displacement: approximately 125cc
- Transmission: 5 or 6-speed constant mesh
- Clutch: Wet multi-plate
- Frame: Steel twin-spar or perimeter
- Front suspension: Telescopic fork
- Rear suspension: Swingarm with monoshock
- Front brake: Single disc
- Rear brake: Drum or single disc depending on year
- Fuel capacity: approximately 15-17 liters
DIAGNOSTIC INFORMATION:
- Engine misfire or hesitation: inspect spark plug condition, clean carburetor jets, verify CDI signal to ignition coil
- Overheating: check coolant level, test thermostat opening temperature, inspect water pump impeller for wear
- Clutch slipping: measure friction plate thickness, check spring free length, adjust clutch cable free play
- Poor fuel economy: clean and adjust carburetor, inspect air filter element, verify choke operation
- Difficult shifting: drain and replace transmission oil, inspect shift forks and drum for wear, adjust clutch lever
- Fork oil leak: replace fork seals, inspect stanchion tubes for pitting or scoring
- No spark condition: test stator pickup coil resistance, check CDI unit output, inspect ignition coil primary and secondary windings
ILLUSTRATIONS AND DIAGRAMS INCLUDED:
- Engine exploded views with parts identification and torque values
- Carburetor cross-section diagrams showing jet and circuit layout
- Wiring harness full schematic with connector pin assignments
- Fork and shock absorber exploded assembly drawings
- Brake caliper piston and seal arrangement
- Frame geometry with torque point specifications
- Transmission gear pattern and dog engagement illustration
COMPATIBILITY:
- Hyosung Comet GT125 model years 2002-2010
- File format: Searchable PDF
FILE PROPERTIES:
- Format: Searchable PDF
- Language: English
- Delivery: Instant digital download
- Access: Download anytime after purchase
