Built around Honda's naked motorcycle platform, the 1991 Honda NT 650 Hawk GT utilizes a 647 cc (39.5 cu in) liquid-cooled twin, four-stroke layout. In factory specification, peak output is rated at 58 HP (42.3 kW) at 5,800 rpm while maximum torque reaches 58.3 Nm (43 lb-ft) at 6,000 rpm, transferring power to the rear wheel through a 5-speed gearbox and chain final drive. With a specific output of 89.6 HP per liter, the engine character is indicating a tractable, stress-free state of tune focused on everyday usability and broad torque delivery.
On the scales, the NT 650 Hawk GT measures 184.2 kg (406 lbs) wet (curb), translating to a power-to-weight ratio of 0.31 HP/kg (3.18 kg per horsepower). Rider ergonomics and chassis geometry center around a 777 mm (30.6 in) seat height — offering a neutral standover height that accommodates most average-inseam riders without sacrificing cornering clearance. The 12.11-liter (3.2 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Within MotoLibrary's Honda archive, this model family spans 4 indexed model years from 1988 to 1991, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Specific Output
89.6 HP/L
Power-to-Weight
0.31 HP/kg (3.18 kg/HP)
Standover Height
777 mm (30.6 in)
Engine
Displacement647.0 ccm (39.48 cubic inches)
Engine TypeTwin, four-stroke
Engine DetailsTwin, four-stroke
Power58.0 HP (42.3 kW)) @ 5800 RPM
Torque58.3 Nm (5.9 kgf-m or 43.0 ft.lbs) @ 6000 RPM
Compression9.4:1
Bore x Stroke77.0 x 66.0 mm (3.0 x 2.6 inches)
Valves/Cylinder3
Fuel SystemCarburettor. 2 x CV carburetors
Fuel ControlSingle Overhead Cams (SOHC)
CoolingLiquid
Max RPM6800
Transmission
Gearbox5-speed
Final DriveChain (final drive)
ClutchWet Plate
Chassis
Frame TypeSingle Swing Arm
Rake27.0°
Trail112 mm (4.4 inches)
Wheels & Brakes
Front Tyre110/80-17
Rear Tyre150/70-17
Front BrakesSingle disc
Rear BrakesSingle disc
Dimensions & Weight
Dry Weight167.8 kg (370.0 pounds)
Weight incl.184.2 kg (406.0 pounds)
Power/Weight0.3456 HP/kg
Seat Height777 mm (30.6 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.
Transmission
Transmission and final drive affect maintenance, smoothness and everyday usability.
