At the heart of the 2009 Hyosung GT 650 naked motorcycle, Hyosung features a 647 cc (39.5 cu in) liquid-cooled v2, four-stroke configuration. In factory specification, peak output is rated at 79 HP (57.7 kW), transferring power to the rear wheel through a 5-speed gearbox and chain final drive. With a specific output of 122.1 HP per liter, the engine character is reflecting a performance-oriented street tune that balances strong mid-range pull with an energetic top-end rush.
On the scales, the GT 650 measures 196 kg (432 lbs) dry, translating to a power-to-weight ratio of 0.4 HP/kg (2.48 kg per horsepower). Rider ergonomics and chassis geometry center around a 780 mm (30.7 in) seat height — offering a neutral standover height that accommodates most average-inseam riders without sacrificing cornering clearance, combined with a 1,435 mm (56.5 in) wheelbase engineered for balanced agility and highway composure. The 17-liter (4.5 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Within MotoLibrary's Hyosung archive, this model family spans 3 indexed model years from 2005 to 2009, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Specific Output
122.1 HP/L
Power-to-Weight
0.4 HP/kg (2.48 kg/HP)
Standover Height
780 mm (30.7 in)
Engine
Displacement647.0 ccm (39.48 cubic inches)
Engine TypeV2, four-stroke
Engine DetailsV2, four-stroke
Power79.0 HP (57.7 kW))
Valves/Cylinder4
Fuel SystemCarburettor
Fuel ControlDouble Overhead Cams/Twin Cam (DOHC)
CoolingLiquid
Transmission
Gearbox5-speed
Final DriveChain (final drive)
Chassis
Front SuspensionTelescopic
Rear SuspensionSwing Arm
Wheelbase1435 mm (56.5 inches)
Ground Clearance150 mm (5.9 inches)
Wheels & Brakes
Front Tyre120/60-ZR17
Rear Tyre160/60-ZR17
Front BrakesDouble disc
Rear BrakesSingle disc
Dimensions & Weight
Dry Weight196.0 kg (432.1 pounds)
Power/Weight0.4031 HP/kg
Seat Height780 mm (30.7 inches) If adjustable, lowest setting.
Use this page to compare this motorcycle by its real specifications, not only by model name. Focus on the details that affect fit, comfort, handling, range and ownership.
Power
Compare engine output with similar motorcycles if acceleration, highway use or two-up riding matters.
Seat Height
Check the seat height against your inseam and riding posture before choosing a motorcycle.
Weight
Compare weight carefully because it affects low-speed handling, parking and confidence.
Fuel Capacity
Fuel capacity helps estimate touring range and how often you may need to stop.
Brakes
Brake setup is worth comparing if you ride in traffic, mountains or with a passenger.
Suspension
Suspension details can matter for comfort, road feel and long-distance riding.
Transmission
Transmission and final drive affect maintenance, smoothness and everyday usability.
