Market Position:
The Hyosung Comet GT 250 was positioned as an entry-level to mid-range sport-naked motorcycle, offering a balance of performance and affordability in its class.
Competitors:
Competed with models like the Kawasaki Ninja 250, Honda CBR250R, and Yamaha R25 (depending on regional availability and specific model years).
Key Features Vehicle:
V-twin engine configuration, sporty styling, accessible performance for new riders, good value proposition.
Key Features Manual:
Comprehensive coverage, detailed step-by-step procedures, numerous illustrations and diagrams, printable format, instant download.
Engine Mechanical:
Engine assembly, disassembly, inspection, repair, overhaul, valve adjustments, piston and ring service, crankshaft and bearing service, cylinder head service, timing chain/belt service.
Fuel System:
Carburetor service, fuel pump operation, fuel filter replacement, fuel tank service, fuel line inspection.
Cooling System:
Radiator service, coolant replacement, thermostat operation, fan control, water pump maintenance.
Exhaust System:
Muffler inspection, exhaust pipe routing, gasket replacement.
Transmission:
Gearbox disassembly, assembly, inspection, shifting mechanism, clutch operation, lubrication.
Drivetrain:
Chain and sprockets inspection and replacement, rear wheel hub service.
Brakes:
Front and rear brake caliper service, master cylinder overhaul, brake pad and shoe replacement, brake fluid flush, brake line inspection.
Suspension:
Front fork service (oil change, seal replacement), rear shock absorber inspection and replacement, swingarm service, linkage inspection.
Steering:
Handlebar inspection, steering stem bearing service, headstock adjustment.
Electrical System:
Wiring diagrams, battery maintenance, charging system (alternator, rectifier/regulator), lighting circuits, starter motor operation, fuse box layout, switchgear inspection.
Body And Frame:
Frame inspection, fairing removal and installation, seat service, tank mounting, body panel adjustments.
Ignition System Coverage:
Spark plug service, ignition coil testing, CDI unit function, timing analysis.
Maintenance Procedures:
Regular maintenance tasks, lubrication points, fluid checks, filter changes, chain adjustment.
Troubleshooting:
Diagnostic procedures for common and uncommon issues, symptom-based problem solving, electrical system troubleshooting, engine performance diagnostics.
Repair Procedures:
Detailed step-by-step instructions for component disassembly, repair, and reassembly.
Installation Procedures:
Instructions for installing new or replacement parts and components.
Adjustment Procedures:
Carburetor synchronization, clutch adjustment, brake lever adjustment, steering head bearing adjustment.
Technical Depth:
Comprehensive, covering basic maintenance to complete engine and transmission overhaul. Includes diagnostic procedures and service specifications.
Engine Type:
Liquid-cooled, 4-stroke, 8-valve, DOHC, V-twin
Bore X Stroke:
57.0 mm x 47.0 mm
Compression Ratio:
11.0:1 (Typical)
Horsepower:
Approx. 30-32 HP (at crank)
Torque:
Approx. 22-24 Nm (at crank)
Fuel Delivery:
Carburetor (likely Mikuni dual carburetors)
Fuel Type:
Unleaded Gasoline (91 octane or higher recommended)
Oil Type:
SAE 10W-40 API SG or higher (motorcycle specific)
Oil Capacity:
Approx. 1.5 - 1.8 Liters (with filter change)
Initial Service:
Typically around 1000 km or 1 month, including oil and filter change, chain adjustment, and general inspection.
Major Service Intervals:
Regular intervals for oil changes (e.g., every 3000-6000 km or 6-12 months), spark plug replacement (e.g., every 12000-18000 km), valve clearance checks (e.g., every 12000-24000 km).
Fork Oil Type:
Refer to manual for specific viscosity (often SAE 10W or similar).
Coolant Type:
Ethylene glycol-based antifreeze with corrosion inhibitors (50/50 mix with distilled water).
Common Issues:
Potential for carburetor synchronization issues, occasional electrical connector corrosion, and normal wear and tear on consumables like brake pads and tires. The manual will detail troubleshooting for these.
Maintenance Tips:
Regularly check tire pressure, chain tension and lubrication, brake fluid level, and coolant level. Listen for unusual noises. Follow the periodic maintenance chart diligently.
Brand Heritage:
Hyosung is a South Korean manufacturer known for producing motorcycles, ATVs, and scooters, often emphasizing value and performance for the price.
Model Evolution:
The Comet GT 250, with its V-twin engine, was a significant model for Hyosung in the quarter-liter segment, offering a more sophisticated engine configuration compared to single-cylinder competitors of the era.
Production Period:
The specific generation covered by this manual (2002-2007) represents an early phase of the GT 250's production run, with subsequent updates and variations introduced in later years.
