Engineered by Hyosung for the naked motorcycle segment, the 2018 Hyosung GT 650i Naked relies on a 647 cc (39.5 cu in) liquid-cooled v2, four-stroke powerplant. In factory specification, peak output is rated at 74 HP (54 kW) at 9,000 rpm while maximum torque reaches 62 Nm (45.7 lb-ft) at 7,250 rpm, transferring power to the rear wheel through a 6-speed gearbox and chain final drive. With a specific output of 114.4 HP per liter and a 1,750 rpm working window between peak torque (7,250 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 650i Naked measures 208 kg (459 lbs) wet (curb), translating to a power-to-weight ratio of 0.36 HP/kg (2.81 kg per horsepower). Rider ergonomics and chassis geometry center around a 830 mm (32.7 in) seat height — resulting in a taller command-style riding posture suited to medium-to-tall inseams, combined with a 1,435 mm (56.5 in) wheelbase engineered for balanced agility and highway composure. The 17.03-liter (4.5 US gal) fuel tank supports practical everyday commuting and weekend road stints, while factory top speed is listed at 210 km/h (130 mph).
Specific Output
114.4 HP/L
Power-to-Weight
0.36 HP/kg (2.81 kg/HP)
Power Band Window
7,250–9,000 rpm
Standover Height
830 mm (32.7 in)
Engine
Displacement647.0 ccm (39.48 cubic inches)
Engine TypeV2, four-stroke
Engine Details90° V-twin
Power74.0 HP (54.0 kW)) @ 9000 RPM
Torque62.0 Nm (6.3 kgf-m or 45.7 ft.lbs) @ 7250 RPM
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.
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.
