Sportbikes

2025Kawasaki Ninja 400 ZX 4R

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The 2025 Kawasaki Ninja 400 ZX 4R is a small-capacity sportbike built for riders who love to chase revs, thanks to a screaming in-line four that makes 76 hp at 14,500 rpm. Its trellis frame, Showa suspension and twin front discs suit keen track-day newcomers and spirited backroad riders. It is best known for bringing genuine four-cylinder character to the lightweight sport class.

Capacity: 399.0 ccm
Engine: In-line four, four-stroke
Gearbox: 6-speed
Dry weight: 175.0 kg
Seat height: 800 mm
Power: 76.0 HP (57.0 kW) @ 14500 RPM

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Other years 2025 2026

How it rides

Editorial estimate from the spec sheet - not lab tested

Off-road & trail5%

Cornering93%

City riding65%

Daily riding55%

Touring30%

Two-up30%

Track90%

Best for: Built primarily for spirited canyon carving and track days, with the high-revving four-cylinder engine favoring high RPM performance over low-end torque.
Built for: A rev-happy, engaging small-displacement sportbike that channels genuine supersport character into an approachable, lightweight package.
Not ideal for: Not a good fit for riders seeking long-distance comfort, passenger touring, or any off-road capability.

Scores are derived from the spec sheet using the same model across every bike, so they compare like for like.

Will it fit you?

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Your height

Inseam (optional)

Units

At 800mm, a rider of 175cm with a 79cm (estimated) inseam will reach the ground with both feet flat on the 2025 Kawasaki Ninja 400 ZX 4R, with a cramped knee angle of around 70 degrees and a forward-leaning riding position.

Assumes about 30mm of suspension sag once seated. This is an approximation from category-typical geometry, not a measurement of this bike or of you - sit on one before you buy.

More bikes at 751-820 mm — Middle Ground →

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Range and running costs

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Units

Currency

Fuel per litre

Riding a year

Based on the maker's published fuel consumption 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.

Full specifications

Engine

Capacity: 399.0 ccm
Power: 76.0 HP (57.0 kW) @ 14500 RPM
CO2 Emissions: 120 CO2 g/km
Torque: 39.0 Nm (4.0 kgf-m) @ 13000 RPM
Engine type: In-line four, four-stroke
Fuel consumption: 5.10 litres/100 km (19.6 km/l)
Power/weight ratio: 0.4343 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: TCBI w/digital advance
Valves per cylinder: 4
Lubrication system: Forced lubrication, wet sump

Transmission

Gearbox: 6-speed
Transmission type: Manual
Final drive: Chain
Clutch: Wet multi-disc, manual. Assist and Slipper.

Dimensions & weight

Wheelbase: 1380 mm
Overall length: 1990 mm
Overall width: 765 mm
Overall height: 1110 mm
Seat height: 800 mm
Dry weight: 175.0 kg
Wet weight: 189.0 kg
Fuel capacity: 15.00 litres
Ground clearance: 135 mm

Chassis & suspension

Frame: Trellis, high-tensile steel
Front suspension: 37mm inverted Showa fork with SFF-BP internals
Rear suspension: Horizontal back-link, Showa shock w/ adjustable spring preload
Front wheel travel: 120 mm
Rear wheel travel: 124 mm
Rake (fork angle): 23.5°
Trail: 97 mm

Brakes & wheels

Front brakes: Double disc. 4-piston calipers. Optional ABS.
Front brakes diameter: 290 mm
Rear brakes: Single disc. Single-piston caliper. Optional ABS.
Rear brakes diameter: 220 mm
ABS: Optional
Front tyre: 120/70-ZR17
Rear tyre: 160/60-ZR17

Other

Color options: METALLIC SPARK BLACK
Comments: Small windscreen. Integrated Riding Modes. Power Mode Selection. Economical Riding Indicator. Smartphone connectivity.

Specs last verified against published sources: October 2026.