Positioned in Kawasaki's sport motorcycle lineup, the 2023 Kawasaki Ninja ZX-6R features a 636 cc (38.8 cu in) liquid-cooled in-line four, four-stroke configuration. In factory specification, peak output is rated at 126.2 HP (92.1 kW) at 13,500 rpm while maximum torque reaches 70.8 Nm (52.2 lb-ft) at 11,000 rpm, transferring power to the rear wheel through a 6-speed gearbox and chain final drive. With a specific output of 198.4 HP per liter and a 2,500 rpm working window between peak torque (11,000 rpm) and peak power (13,500 rpm), the engine character is placing it firmly in high-revving supersport territory where top-end breathing dominates.
On the scales, the Ninja ZX-6R measures 195 kg (430 lbs) wet (curb), translating to a power-to-weight ratio of 0.65 HP/kg (1.55 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 1,400 mm (55.1 in) wheelbase engineered for quick, flickable steering geometry. The 17-liter (4.5 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Within MotoLibrary's Kawasaki archive, this model family spans 16 indexed model years from 2004 to 2025, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Specific Output
198.4 HP/L
Power-to-Weight
0.65 HP/kg (1.55 kg/HP)
Power Band Window
11,000–13,500 rpm
Standover Height
830 mm (32.7 in)
Engine
Displacement636.0 ccm (38.81 cubic inches)
Engine TypeIn-line four, four-stroke
Power126.2 HP (92.1 kW)) @ 13500 RPM
Torque70.8 Nm (7.2 kgf-m or 52.2 ft.lbs) @ 11000 RPM
Compression12.9:1
Bore x Stroke67.0 x 45.1 mm (2.6 x 1.8 inches)
Valves/Cylinder4
Fuel SystemInjection. DFI® with 38mm Keihin throttle bodies (4) and oval sub-throttles
Fuel ControlDouble Overhead Cams/Twin Cam (DOHC)
IgnitionTCBI with digital advance
LubricationForced lubrication, wet sump with oil cooler
CoolingLiquid
Transmission
Gearbox6-speed
Final DriveChain (final drive)
ClutchAssist and Slipper clutch
DrivelineSealed chain
Chassis
Frame TypePressed-aluminum perimeter
Rake23.5°
Trail102 mm (4.0 inches)
Front Suspension41mm inverted Showa SFF-BP fork with top-out springs, stepless compression and rebound damping, adjustable spring preload
Front Travel119 mm (4.7 inches)
Rear SuspensionBottom-Link Uni-Trak with gas-charged shock, top-out spring and pillow ball upper mount. Compression damping
Seat Height830 mm (32.7 inches) If adjustable, lowest setting.
Overall Height1100 mm (43.3 inches)
Overall Length2025 mm (79.7 inches)
Overall Width710 mm (28.0 inches)
Fuel Capacity17.00 litres (4.49 US gallons)
Other
StarterElectric
Color OptionsMetallic Matte Twilight Blue/Metallic Diablo Black, Metallic Matte Graphenesteel Gray/Metallic Diablo Black
InstrumentsMulti-function LCD screen
Warranty12 Month Limited Warranty
Notes
Small windscreen. Kawasaki TRaction Control (KTRC), Power Mode, Kawasaki Intelligent anti-lock Brake System (KIBS), Kawasaki Quick Shifter (KQS) (upshift only).
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.
