Engineered by Hyosung for the naked motorcycle segment, the 2005 Hyosung GT 650 features a 647 cc (39.5 cu in) v2, four-stroke configuration. In factory specification, peak output is rated at 76.4 HP (55.8 kW) at 9,000 rpm while maximum torque reaches 68 Nm (50.2 lb-ft) at 7,500 rpm, transferring power to the rear wheel through a 6-speed gearbox. With a specific output of 118.1 HP per liter and a 1,500 rpm working window between peak torque (7,500 rpm) and peak power (9,000 rpm), 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 208 kg (459 lbs) dry, translating to a power-to-weight ratio of 0.37 HP/kg (2.72 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. The 17-liter (4.5 US gal) fuel tank supports practical everyday commuting and weekend road stints, while factory top speed is listed at 140 km/h (87 mph).
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
118.1 HP/L
Power-to-Weight
0.37 HP/kg (2.72 kg/HP)
Power Band Window
7,500–9,000 rpm
Standover Height
780 mm (30.7 in)
Engine
Displacement647.0 ccm (39.48 cubic inches)
Engine TypeV2, four-stroke
Engine DetailsV2, four-stroke
Power76.4 HP (55.8 kW)) @ 9000 RPM
Torque68.0 Nm (6.9 kgf-m or 50.2 ft.lbs) @ 7500 RPM
Compression11.4:1
Bore x Stroke81.5 x 62.0 mm (3.2 x 2.4 inches)
Valves/Cylinder4
Fuel ControlDouble Overhead Cams/Twin Cam (DOHC)
IgnitionElectronic
Transmission
Gearbox6-speed
Performance
Top Speed140.0 km/h (87.0 mph)
Chassis
Front SuspensionTelescopic
Front Travel120 mm (4.7 inches)
Rear SuspensionSwingarm
Rear Travel120 mm (4.7 inches)
Wheels & Brakes
Front Tyre120/60-ZR17
Rear Tyre160/60-ZR17
Front BrakesDouble disc
Front Brake Ø300 mm (11.8 inches)
Rear BrakesSingle disc
Rear Brake Ø230 mm (9.1 inches)
Dimensions & Weight
Dry Weight208.0 kg (458.6 pounds)
Power/Weight0.3675 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.
Torque
Torque is useful for judging real-world pull, especially for touring, commuting and loaded riding.
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.
