Sportbikes
2025Kawasaki Ninja ZX 4RR
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The 2025 Kawasaki Ninja ZX-4RR is a small-capacity sportbike built for riders who chase revs rather than raw grunt, with a screaming in-line four that peaks at 76.4 hp at 14,500 rpm. It suits track-day enthusiasts and keen road riders wanting big-bike feel in a lightweight package. Best known for bringing 400cc four-cylinder thrills back to modern showrooms.
- Capacity
- 399.0 ccm
- Engine
- In-line four, four-stroke
- Gearbox
- 6-speed
- Dry weight
- 166.0 kg
- Seat height
- 800 mm
- Power
- 76.4 HP (57.0 kW) @ 14500 RPM
How it rides
Editorial estimate from the spec sheet - not lab tested- Best for
- Built as a small-displacement supersport, it's designed for spirited backroad riding and track days rather than utility or commuting.
- Built for
- It has the soul of a miniature superbike, revving to nearly 15,000 rpm with a screaming inline-four soundtrack and razor-sharp handling manners.
- Not ideal for
- This is not the right choice for riders wanting long-distance comfort, pillion practicality, or low-rpm, relaxed everyday usability.
Scores are derived from the spec sheet using the same model across every bike, so they compare like for like.
Will it fit you?
Worked out in your browser - nothing is sent to usRange and running costs
Worked out in your browser - nothing is sent to usBased on the published US (EPA-style) fuel economy estimate and tank size. Real-world figures depend on how and where you ride, and the last litres of a tank are reserve. Prices shown greyed are examples - type your own.
Engine
- Capacity
- 399.0 ccm
- Power
- 76.4 HP (57.0 kW) @ 14500 RPM
- CO2 Emissions
- 134 CO2 g/km
- EPA Certificate No.
- SKAXC.399AAC-011
- EPA Est. Fuel Consumption
- 5.71 L/100km (41.2 US mpg)
- EPA CO Emissions
- 0.4 CO g/km
- Torque
- 39.0 Nm (4.0 kgf-m) @ 13000 RPM
- Engine type
- In-line four, four-stroke
- Power/weight ratio
- 0.4602 HP/kg (dry)
- Bore x stroke
- 57.0 x 39.1 mm
- Compression
- 12.3:1
- Cooling system
- Liquid
- Fuel system
- Injection
- Starting
- Electric
- Ignition
- Digital
- Aspiration
- Naturally aspirated
- Valves per cylinder
- 4
- Lubrication system
- Forced lubrication, wet sump
Transmission
- Gearbox
- 6-speed
- Transmission type
- Manual
- Final drive
- Chain
- Clutch
- Wet multi-disc
Performance
- 0-60 mph
- 4.20 seconds
- 0-100 km/h (0-62 mph)
- 4.60 seconds
Dimensions & weight
- Wheelbase
- 1379 mm
- Overall length
- 1989 mm
- Overall width
- 765 mm
- Overall height
- 1110 mm
- Seat height
- 800 mm
- Dry weight
- 166.0 kg
- Wet weight
- 188.0 kg
- Fuel capacity
- 15.10 litres
- Ground clearance
- 135 mm
Chassis & suspension
- Frame
- Trellis, high-tensile steel
- Front suspension
- 37mm inverted fork with SFF-BP internals and spring preload adjustability
- Rear suspension
- Horizontal Back-link, BFRC lite gas charged shock w/ piggyback reservoir, adjustable compression, rebound and spring preload
- Front wheel travel
- 119 mm
- Rear wheel travel
- 124 mm
- Rake (fork angle)
- 23.5°
- Trail
- 97 mm
Brakes & wheels
- Front brakes
- Double disc. ABS.
- Front brakes diameter
- 290 mm
- Rear brakes
- Single disc. ABS.
- Rear brakes diameter
- 220 mm
- ABS
- Yes
- Front tyre
- 120/70-17
- Rear tyre
- 160/60-17
Other
- Color options
- Lime Green/Ebony/Pearl Blizzard White
- Comments
- Kawasaki spec: 57.0 kW (77 PS) at 14,500 rpm; 58.7 kW (80 PS) with RAM air. RR adds preload-adjustable fork, Showa BFRC lite rear shock (as on ZX-10R) and two-way quick shifter (KQS).
- Fuel Tank Material
- Metal
Compiled from manufacturer documentation and user contributions, corrected on an ongoing basis. Spotted something wrong? Tell us.
What changed, year to year
Differences highlighted| Specification | 2025 | 2026 |
|---|---|---|
| Capacity | 399 cc | 399 cc |
| Dry weight | 166 kg | 174 kg |
| Seat height | 800 mm | 800 mm |
| Fuel capacity | 15.1 L | 15.1 L |
Illustrative - generated automatically by diffing the year records already on file, not a manufacturer-published changelog.
Rider Reviews
Common questions
What is the engine size of the Kawasaki Ninja ZX 4RR?
The 2025 Kawasaki Ninja ZX 4RR has a Capacity of 399.0 ccm (24.35 cubic inches).
What engine power does the Kawasaki Ninja ZX 4RR have?
The 2025 Kawasaki Ninja ZX 4RR has a Power of 76.4 HP (57.0 kW) @ 14500 RPM.
How many gears does the Kawasaki Ninja ZX 4RR have?
The 2025 Kawasaki Ninja ZX 4RR has a Gearbox of 6-speed.
What is the torque of the Kawasaki Ninja ZX 4RR?
The 2025 Kawasaki Ninja ZX 4RR has a Torque of 39.0 Nm (4.0 kgf-m or 28.8 ft.lbs) @ 13000 RPM.
How much does the Kawasaki Ninja ZX 4RR weigh?
The 2025 Kawasaki Ninja ZX 4RR has a Dry weight of 166.0 kg (366.0 pounds).
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