Market Segment:
Entry-level to mid-range cruiser motorcycle, popular for customization and commuting
Key Competitors:
Honda Shadow 750, Kawasaki Vulcan 500, Suzuki Boulevard S40, Yamaha V-Star 650 (in terms of styling and intended use)
Design Philosophy:
Classic cruiser styling with a V-twin engine, designed for comfortable riding and accessibility
Efi Advantage:
Electronic Fuel Injection offers improved fuel efficiency, throttle response, and easier cold starts compared to carbureted models
Engine Mechanical:
Complete overhaul, piston, rings, cylinder, crankshaft, camshaft, valve train, timing
Engine Electrical:
Ignition system, CDI unit, spark plugs, charging system, stator, regulator/rectifier, starting system
Fuel System:
Electronic Fuel Injection (EFI) system, throttle body, fuel pump, injectors, sensors (MAP, TPS, IAT), ECU diagnostics
Transmission:
Clutch operation, gear shifting mechanism, transmission disassembly and assembly, gear ratios
Chassis:
Frame, swingarm, suspension (front fork, rear shock absorber) disassembly and adjustment
Braking System:
Front and rear brake calipers, master cylinders, brake lines, bleeding procedures, pad replacement
Electrical System:
Wiring diagrams, lighting system, instrumentation, horn, battery, fuses, relays
Cooling System:
Radiator, fan, coolant, hoses, thermostat
Exhaust System:
Exhaust pipes, mufflers, catalytic converter (if applicable)
Scheduled Maintenance:
Oil changes, filter replacements, chain adjustment, spark plug checks, valve clearance checks
Troubleshooting:
Diagnostic flowcharts for common issues, error code interpretation for EFI system
Repair Procedures:
Step-by-step instructions for major component overhauls and replacements
Assembly Disassembly:
Detailed guides for taking apart and reassembling all major motorcycle systems
Adjustment Procedures:
Carburetor synchronization (for non-EFI models, though this is EFI), clutch adjustment, throttle cable adjustment, suspension settings
Depth Level:
Comprehensive (from basic maintenance to complete engine rebuild)
Diagnostic Capability:
Includes EFI system diagnostic codes and procedures
Engine Type:
4-stroke, liquid-cooled, 45-degree V-twin
Displacement:
249 cc (249 cm³)
Bore X Stroke:
57 mm x 49 mm
Compression Ratio:
11.0:1
Valvetrain:
DOHC, 4 valves per cylinder
Horsepower:
Approximately 30-33 HP (varies by market and specific tuning)
Torque:
Approximately 23-25 Nm (varies by market and specific tuning)
Fuel Delivery:
Electronic Fuel Injection (EFI) with Keihin (or similar) components
Fuel Type:
Unleaded gasoline
Fuel Tank Capacity:
15 Liters (approx.)
Instrumentation:
Analog tachometer, digital speedometer, fuel gauge, gear indicator, clock, and warning lights.
ABS:
ABS was an optional feature on some later EFI models.
Diagnostic Port:
OBD-II or proprietary diagnostic connector for EFI system access
Oil Change Interval:
Every 4,000 - 6,000 km or 6 months, whichever comes first (refer to manual for exact spec)
Air Filter Inspection:
Every 6,000 km
Spark Plug Replacement:
Every 12,000 - 16,000 km
Valve Clearance Check:
Every 12,000 - 18,000 km
Engine Oil Type:
SAE 10W-40 API SG or higher, JASO MA
Engine Oil Capacity:
Approx. 1.8 Liters (with filter change)
Coolant Type:
Ethylene glycol-based antifreeze (50% solution) with corrosion inhibitors
Chain Lubricant:
Motorcycle chain lubricant (e.g., SAE 80W-90 gear oil for dry conditions, specialized chain lube)
Common Complaints:
Some owners report occasional starting issues in very cold weather (addressed by EFI), potential for electrical connector corrosion in humid climates, and the need for regular chain maintenance.
Efi Considerations:
EFI system requires clean fuel and proper maintenance of sensors; diagnostic tools may be needed for advanced troubleshooting.
Manufacturer:
Hyosung (part of S&T Motors, now KR Motors)
Gv250 Introduction:
The GV250 model, also known as the Aquila, was introduced to offer a stylish cruiser option in the smaller displacement segment. The GT250 EFI is an evolution featuring modern fuel injection.
Production Period:
The GV250/GT250 platform has been in production for many years, with EFI versions becoming more prevalent from the late 2000s onwards.
