2021 Kawasaki Vulcan S SE Technical Analysis & Specification Breakdown
Engineered by Kawasaki for the custom - cruiser motorcycle segment, the 2021 Kawasaki Vulcan S SE pairs a 649 cc (39.6 cu in) twin, four-stroke architecture with road-focused gearing. In factory specification, peak output is rated at 46.9 HP (34.3 kW) at 6,600 rpm while maximum torque reaches 53 Nm (39.1 lb-ft) at 5,600 rpm, transferring power to the rear wheel through chain final drive. With a specific output of 72.3 HP per liter and a 1,000 rpm working window between peak torque (5,600 rpm) and peak power (6,600 rpm), the engine character is indicating a tractable, stress-free state of tune focused on everyday usability and broad torque delivery.
On the scales, the Vulcan S SE measures 226 kg (498 lbs) wet (curb), translating to a power-to-weight ratio of 0.21 HP/kg (4.82 kg per horsepower). Rider ergonomics and chassis geometry center around a 705 mm (27.8 in) seat height — giving shorter riders and urban commuters confident flat-foot reach at traffic stops, combined with a 1,575 mm (62 in) wheelbase engineered for planted straight-line stability. The 14-liter (3.7 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Within MotoLibrary's Kawasaki archive, this model family spans 3 indexed model years from 2019 to 2021, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Specific Output
72.3 HP/L
Power-to-Weight
0.21 HP/kg (4.82 kg/HP)
Power Band Window
5,600–6,600 rpm
Standover Height
705 mm (27.8 in)
Engine
Displacement649.0 ccm (39.60 cubic inches)
Engine TypeTwin, four-stroke
Power46.9 HP (34.3 kW)) @ 6600 RPM
Torque53.0 Nm (5.4 kgf-m or 39.1 ft.lbs) @ 5600 RPM
Compression10.8:1
Bore x Stroke83.0 x 60.0 mm (3.3 x 2.4 inches)
Fuel SystemInjection. Ø 38 mm x 2 (Keihin)
Fuel ControlDouble Overhead Cams/Twin Cam (DOHC)
IgnitionTCBI with digital advance
Transmission
Final DriveChain (final drive)
DrivelineSealed chain
Chassis
Frame TypePerimeter, high-tensile steel
Rake31.0°
Trail119 mm (4.7 inches)
Front Suspension41mm Telescopi fork
Front Travel130 mm (5.1 inches)
Rear SuspensionLay-down offset rear shock with linkage and adjustable preload
Rear Travel80 mm (3.1 inches)
Wheelbase1575 mm (62.0 inches)
Ground Clearance130 mm (5.1 inches)
Wheels & Brakes
Front Tyre120/70-18
Rear Tyre160/60-17
Front BrakesDouble disc. Dual-piston caliper and ABS
Front Brake Ø300 mm (11.8 inches)
Rear BrakesSingle disc. Single piston caliper and ABS
Rear Brake Ø250 mm (9.8 inches)
Dimensions & Weight
Weight incl.226.0 kg (498.2 pounds)
Seat Height705 mm (27.8 inches) If adjustable, lowest setting.
Overall Height1100 mm (43.3 inches)
Overall Length2310 mm (90.9 inches)
Overall Width880 mm (34.6 inches)
Fuel Capacity14.00 litres (3.70 US gallons)
Other
StarterElectric
Color OptionsMetallic Spark Black with Special Edition Blue Tank Graphic
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.
