This manual covers the GT125 Comet and GT250 Comet, produced from 2002 onwards. These models represent an offering in the entry-level to mid-level sportbike market, known for their robust engineering and reliability. The GT125, typically featuring a 124cc engine and dual carburetors, and the GT250, often equipped with a 249cc V-twin engine and available with fuel injection on later variants, provide an engaging riding experience. With features like disc brakes, a steel frame, and a manual transmission, these motorcycles are designed for both everyday commuting and spirited riding.
This comprehensive service repair manual, presented in English, provides in-depth guidance for maintaining and repairing all GT125 and GT250 Comet models. It covers a wide array of systems, including the engine (fuel, lubrication, cooling, combustion, drivetrain), transmission, chassis, suspension, braking, and electrical systems. Detailed step-by-step instructions, exploded diagrams, and troubleshooting sections are included to assist owners and technicians with everything from routine maintenance, such as oil changes and valve adjustments, to complex repairs. This resource is designed to help you keep your vehicle in optimal condition and save on repair costs.
First Generation Start Year:
2002
Chassis Code Gt125:
Possible variations include GV125C, GT125R, etc., depending on specific sub-model.
Chassis Code Gt250:
Possible variations include GT250R, GT250 EFI, etc., depending on specific sub-model.
Quality Claim:
BEST manuals on Tradebit, buy with confidence. Don't waste your money on incomplete cheap versions.
Cost Savings:
Save a lot of money in repair bills.
Empowerment:
Help look after your vehicle, complete repairs effortlessly.
Detail Level:
Highly detailed exploded pictures & diagrams.
Resource Quality:
Professional Quality, absolute best resources available.
Model Years Covered:
2002 onwards
All Models Covered:
Yes, explicitly stated as covering ALL models.
Repair Scope:
A-Z (All repairs from simple to complicated)
Estimated Page Count:
Not explicitly stated, but implied to be extensive given the 'A-Z' coverage and detail level.
Type:
Service Repair Manual (akin to Factory Workshop Manuals or CDROM Manuals)
Accessibility:
Downloadable, Instant Download
Compatibility:
Win/MAC/Linux
Engine:
Fuel System, Lubrication and Cooling, Combustion System, Cylinder Head/Valves, Crankcase/Piston/Cylinder, Crankshaft/Transmission/Balancer, Alternator/Starter Clutch, Fuel Injection System.
Transmission:
Gearbox & Clutch, Transmission System, Crankshaft/Transmission/Balancer.
Chassis And Suspension:
Front Wheel and Steering System, Rear Wheel System, Suspension, Chassis, Frame/Body Panels.
Braking:
Braking System, Wheels/Tires/Brakes.
Electrical:
Electrical System, Battery/Charging System, Ignition System, Electric Starter, Lights/Meters/Switches, Wiring Diagrams.
Bodywork:
Body & Fixtures, Frame/Body Panels/Exhaust System, Fenders and Exhaust Pipe.
Maintenance:
Periodic checks & Adjustments, General Maintenance.
Repair:
Engine Removal and Installation, all major and minor repairs A-Z.
Diagnostics:
Troubleshooting section explicitly mentioned.
Depth:
Professional Quality, highly detailed, step-by-step instructions with exploded pictures and diagrams, suitable for professional mechanics.
Searchability:
Implied by PDF format, allowing for text searching.
Printable:
Yes, the entire manual or specific sections can be printed.
Binding:
N/A (Digital download)
Paper Quality:
N/A (Digital download)
Configuration:
Likely a V-twin or inline-twin liquid-cooled engine.
Displacement:
Approximately 124cc (based on model name)
Configuration:
Likely a V-twin liquid-cooled engine.
Displacement:
Approximately 249cc (based on model name)
Horsepower Gt250 Estimate:
Typically in the range of 25-30 HP for this class.
Torque Gt250 Estimate:
Likely around 15-20 lb-ft.
Carburetor Gt125 Common:
Likely dual carburetors for the GT125.
Fuel Injection Gt250 Variants:
Later GT250 models and EFI variants will feature fuel injection.
Type:
Manual 5-speed or 6-speed constant mesh gearbox.
Clutch Type:
Wet multi-plate clutch.
Gear Ratios:
Detailed gear ratios will be present in the manual.
Wheelbase Gt250 Typical:
Around 1435mm (56.5 inches).
Dry Weight Gt250 Typical:
Around 160-170 kg (350-375 lbs).
Safety Ratings:
N/A (Motorcycle specific safety ratings are typically not standardized like cars).
Braking System:
Disc brakes front and rear, with potential for dual-piston calipers on the GT250.
Frame Construction:
Steel diamond frame or perimeter frame, providing structural integrity.
Display Type:
Analog tachometer and speedometer, with LCD displays for odometer, trip meter, and indicators.
ABS Availability:
ABS was an optional feature on later GT250 models.
Usb Charging:
Not a standard feature on models from this era, but can be added aftermarket. Manual will guide electrical system access.
Oil Change Interval:
Typically every 3,000-5,000 km or annually.
Spark Plug Replacement:
Around 6,000-10,000 km.
Valve Clearance Check:
Typically at the 10,000-12,000 km service.
Engine Oil Type Gt250:
JASO MA, API SG or higher, SAE 10W-40 or 20W-50 (refer to manual for exact specification).
Coolant Type:
Ethylene glycol-based antifreeze/coolant, typically a 50/50 mix with distilled water.
Electrical Gremlins Common:
Some older models may experience minor electrical connection issues; manual helps with tracing and fixing.
Carburetor Tuning:
Carburetors may require periodic adjustment for optimal performance, especially at altitude.
Cooling System Maintenance:
Regular coolant flushes and checks are important for longevity.
Manufacturer:
Hyosung Motors & Machinery Inc. (South Korea)
Comet Lineage:
The Comet series is Hyosung's sportbike offering, aimed at the entry-level to mid-level displacement market.
Production Period:
2002 to present (with continuous updates and variants)
Motorcycle Awards:
No specific widely publicized awards are typically associated with these models; they are generally positioned as affordable and reliable entry-level sportbikes.
