Target Audience:
Owners of Hyosung GT125 and GT250 Comet motorcycles seeking to perform their own maintenance and repairs, as well as independent repair shops.
Value Proposition:
Offers a comprehensive and lifetime-accessible factory-level repair resource at a fraction of the cost of dealership service, enabling significant savings on maintenance and repairs.
Completeness:
Full factory service manual covering all aspects of repair and maintenance, not a condensed or limited version.
Visuals:
Contains hundreds of pages with detailed photos and exploded diagrams to illustrate procedures.
Accessibility:
Instant download, usable on multiple devices without expiration.
Geographic Markets:
All markets where Hyosung GT125 and GT250 Comet models were officially sold and supported.
Estimated Pages:
Hundreds of pages
Type:
Factory Service & Repair Workshop Manual
Content Focus:
Repair, servicing, and troubleshooting
Primary Language:
English
File Format:
Digital (PDF)
Accessibility:
Instant download for computer, tablet, or smartphone
Usage Rights:
Lifetime use on unlimited devices, no expiry, no renewal fees
Engine:
Detailed procedures for engine disassembly, assembly, inspection, and adjustment for both GT125 and GT250 variants, including carburetion/injection systems, ignition, cooling, and lubrication.
Transmission:
Covering clutch operation, gearbox inspection, disassembly, assembly, gear selection mechanisms, and fluid servicing.
Fuel System:
Diagnosis and repair of fuel delivery, carburettors (for GT125 and early GT250), fuel injection systems (for later GT250 models), fuel tank, and lines.
Electrical System:
Comprehensive coverage of wiring diagrams, charging system (stator, regulator/rectifier, battery), starting system (starter motor, solenoid), lighting, ignition system components, and electronic control units (ECUs) where applicable.
Chassis And Suspension:
Front fork (telescopic or upside-down depending on sub-model) maintenance, seal replacement, oil levels; rear shock absorber inspection and adjustment; swingarm inspection and lubrication; steering head bearing service.
Brakes:
Front and rear brake system maintenance, including disc and caliper inspection, pad replacement, hydraulic system bleeding, master cylinder and slave cylinder servicing.
Wheels And Tires:
Tire inspection, replacement, and inflation; wheel bearing maintenance; wheel balancing; spoke tensioning (if applicable).
Exhaust System:
Inspection, repair, and replacement of exhaust pipes, mufflers, and associated hardware.
Bodywork And Trim:
Removal and installation of fairings, body panels, seat, fuel tank, fenders, and other cosmetic components.
Controls And Cables:
Adjustment and replacement of throttle cables, clutch cables, brake cables, and control levers.
Routine Maintenance:
Detailed steps for oil changes, filter replacements, chain lubrication and adjustment, spark plug service, air filter cleaning/replacement, and brake fluid checks.
Troubleshooting:
Diagnostic charts and procedures for identifying and rectifying common mechanical and electrical issues.
Major Repairs:
Step-by-step instructions for engine rebuilds, transmission overhauls, suspension component replacements, and electrical system repairs.
Component Overhaul:
Detailed instructions for disassembling, cleaning, inspecting, and reassembling key components like carburettors, fuel injectors, alternators, and brake calipers.
Wiring Diagrams:
Comprehensive and clearly labeled wiring schematics for all electrical systems.
Depth:
Professional-level detail, suitable for advanced DIY mechanics and professional technicians. Covers everything from basic adjustments to complete engine and gearbox rebuilds.
Diagnostic Capability:
Provides guidance on identifying the root cause of malfunctions through systematic troubleshooting steps.
Gt125 Engine Type:
Likely 125cc V-twin, air-cooled, 4-stroke
Gt125 Bore Stroke:
Specifics vary, but typical for 125cc V-twins.
Gt125 Power Output:
Typically around 13-15 HP, depending on market regulations.
Gt250 Engine Type:
Likely 250cc V-twin, air-cooled, 4-stroke
Gt250 Bore Stroke:
Specifics vary, but typical for 250cc V-twins.
Gt250 Power Output:
Typically around 25-28 HP, depending on market and fuel system.
Valve Train:
DOHC, 8 valves (2 per cylinder) is common for these V-twins.
Gt125 Fuel Delivery:
Carburetor(s), likely Mikuni or Keihin equivalent.
Gt250 Fuel Delivery:
Carburetor(s) for earlier models, potentially Fuel Injection (EFI) for later models or specific variants.
Fuel Tank Capacity:
Typically around 14-17 liters for this class of motorcycle.
Gt125 Dimensions:
Specific dimensions (L x W x H) will be detailed in the manual, but generally a sporty streetfighter/naked bike style.
Gt250 Dimensions:
Specific dimensions (L x W x H) will be detailed in the manual, but generally a sporty streetfighter/naked bike style.
Gt125 Dry Weight:
Likely in the range of 150-165 kg.
Gt250 Dry Weight:
Likely in the range of 170-185 kg.
Gt125 Wet Weight:
Will be higher than dry weight, detailed in manual.
Gt250 Wet Weight:
Will be higher than dry weight, detailed in manual.
Oil Change:
Typically every 3,000-5,000 km or 6 months, whichever comes first. Manual will specify exact interval and oil type.
Valve Clearance:
Usually around 6,000-10,000 km. Manual provides detailed inspection and adjustment procedures.
Spark Plug Replacement:
Typically every 8,000-12,000 km. Manual will list recommended spark plug types (e.g., NGK CR9E or similar).
Engine Oil Type:
JASO MA certified 10W-40 or 10W-50 semi-synthetic or fully synthetic motorcycle oil is common. Specific grade to be confirmed in manual.
Engine Oil Capacity:
Approx. 1.6-1.8 liters for GT125, 1.8-2.0 liters for GT250 (including filter). Exact figures in manual.
Brake Fluid Type:
DOT 4 hydraulic brake fluid is standard. Manual will specify.
Coolant Type:
If liquid-cooled variant exists, a 50/50 mix of ethylene glycol coolant and distilled water. Manual will confirm.
Electrical Connections:
Corrosion in connectors can lead to intermittent electrical faults. Manual's wiring diagrams and troubleshooting sections are crucial.
Carburetor Issues:
Clogging or maladjustment of carburetors can affect performance and idle. Manual provides tuning and cleaning procedures.
Suspension Wear:
Fork seals and rear shock absorbers may wear over time, leading to leaks or a harsh ride. Manual covers replacement and service.
