Built around Kawasaki's sport touring motorcycle platform, the 2004 Kawasaki Ninja ZX-9R features a 899 cc (54.9 cu in) liquid-cooled in-line four, four-stroke configuration. In factory specification, peak output is rated at 144 HP (105.1 kW), transferring power to the rear wheel through a 6-speed gearbox. With a specific output of 160.2 HP per liter, the engine character is placing it firmly in high-revving supersport territory where top-end breathing dominates.
On the scales, the Ninja ZX-9R measures 186 kg (410 lbs) dry, translating to a power-to-weight ratio of 0.77 HP/kg (1.29 kg per horsepower). Rider ergonomics and chassis geometry center around a 815 mm (32.1 in) seat height — offering a neutral standover height that accommodates most average-inseam riders without sacrificing cornering clearance, combined with a 1,415 mm (55.7 in) wheelbase engineered for quick, flickable steering geometry.
Specific Output
160.2 HP/L
Power-to-Weight
0.77 HP/kg (1.29 kg/HP)
Standover Height
815 mm (32.1 in)
Engine
Displacement899.0 ccm (54.86 cubic inches)
Engine TypeIn-line four, four-stroke
Engine DetailsIn-line four, four-stroke
Power144.0 HP (105.1 kW))
Valves/Cylinder4
Fuel ControlDouble Overhead Cams/Twin Cam (DOHC)
CoolingLiquid
Transmission
Gearbox6-speed
Chassis
Wheelbase1415 mm (55.7 inches)
Wheels & Brakes
Front Tyre120/70-ZR17
Rear Tyre190/50-ZR17
Front BrakesDouble disc
Front Brake Ø320 mm (12.6 inches)
Rear BrakesSingle disc
Rear Brake Ø220 mm (8.7 inches)
Dimensions & Weight
Dry Weight186.0 kg (410.1 pounds)
Power/Weight0.7742 HP/kg
Seat Height815 mm (32.1 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.
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.
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.
