Riders who were around in the heyday of 400cc supersport machines in the 1980s and 1990s will remember their high-revving character, how lightweight and compact they were, and their exciting cornering performance. In the modern era, 400cc machines remain an excellent midway point between the 250cc and 600cc classes, but many do not offer the same performance and thrill as their older counterparts. However, the arrival of the new Ninja ZX-4R ushers in a screaming 400cc revolution with an all-new In-Line Four engine making an unprecedented 55 kW (75 PS).
The new 399 cm3 liquid-cooled DOHC In-Line Four engine pushes technological boundaries to comfortably top the 400cc class*. Developed with know-how gained from other Ninja ZX models, the high-performance engine offers class-leading power and a rev-range that extends beyond 15,000 min-1.
The Ninja ZX-4R’s ø37 mm inverted fork uses SFF-BP internals to offer both racetrack performance and everyday usability while the Horizontal Back-link rear suspension offers a progressive character. Offering increased adjustability, the Ninja ZX-4R SE front forks include adjustable spring preload.
Key chassis dimensions (centre of gravity position, swingarm pivot position, engine axis positions, caster angle, etc) were inspired by Kawasaki’s World Superbike Ninja ZX-10RR racer, bringing WorldSBK chassis design thinking to the 400cc class.
Header pipes and collector pipe layout were inspired by the exhaust of the Ninja ZX-6R. Joint pipes link the headers, contributing to strong power output and meeting emissions and sound regulations.
The ZX-4R’s two ø290 mm front brake discs and radial-mount monobloc calipers provide sure stopping power, while also offering excellent braking feel to inspire confidence both on the track and on the street.
Bluetooth technology built into the instrument panel allows connection to smartphones via the “RIDEOLOGY THE APP” smartphone application, enabling riders to access instrument functions for an enhanced motorcycling experience.
The 4.3” all-digital TFT colour instrumentation with selectable display modes (Normal, Circuit) clearly displays the most pertinent information, whether on the street or on the track. Circuit Mode shows the gear position, lap times, and rpm above 10,000 more prominently.
Four integrated riding modes (Sport, Road, Rain or Rider (manual)) make it simple to select a level of traction control and power mode to suit the current riding conditions.
The Ninja ZX-4R SE, with original KRT-inspired colour and graphics, higher-grade front fork with adjustable spring preload, and equipped with a number of accessories, is also available in certain markets.
Accessories equipped on the Ninja ZX-4R SE include:
- Dual-direction KQS
- smoked windshield
- USB outlet
- frame sliders
- adjustable spring preload front fork
The new 399 cm3 liquid-cooled DOHC In-Line Four engine pushes technological boundaries to comfortably top the 400cc class*. Developed with know-how gained from other Ninja ZX models, the high-performance engine offers class-leading power and a rev-range that extends beyond 15,000 min-1.
The Ninja ZX-4R’s ø37 mm inverted fork uses SFF-BP internals to offer both racetrack performance and everyday usability while the Horizontal Back-link rear suspension offers a progressive character. Offering increased adjustability, the Ninja ZX-4R SE front forks include adjustable spring preload.
Key chassis dimensions (centre of gravity position, swingarm pivot position, engine axis positions, caster angle, etc) were inspired by Kawasaki’s World Superbike Ninja ZX-10RR racer, bringing WorldSBK chassis design thinking to the 400cc class.
Header pipes and collector pipe layout were inspired by the exhaust of the Ninja ZX-6R. Joint pipes link the headers, contributing to strong power output and meeting emissions and sound regulations.
The ZX-4R’s two ø290 mm front brake discs and radial-mount monobloc calipers provide sure stopping power, while also offering excellent braking feel to inspire confidence both on the track and on the street.
Bluetooth technology built into the instrument panel allows connection to smartphones via the “RIDEOLOGY THE APP” smartphone application, enabling riders to access instrument functions for an enhanced motorcycling experience.
The 4.3” all-digital TFT colour instrumentation with selectable display modes (Normal, Circuit) clearly displays the most pertinent information, whether on the street or on the track. Circuit Mode shows the gear position, lap times, and rpm above 10,000 more prominently.
Four integrated riding modes (Sport, Road, Rain or Rider (manual)) make it simple to select a level of traction control and power mode to suit the current riding conditions.
The Ninja ZX-4R SE, with original KRT-inspired colour and graphics, higher-grade front fork with adjustable spring preload, and equipped with a number of accessories, is also available in certain markets.
Accessories equipped on the Ninja ZX-4R SE include:
- Dual-direction KQS
- smoked windshield
- USB outlet
- frame sliders
- adjustable spring preload front fork
| DIMENSIONS | |
|---|---|
| Overall length | 1,990 mm |
| Overall width | 765 mm |
| Overall height | 1,110 mm |
| Wheelbase | 1,380 mm |
| Road clearance | 135 mm |
| Seat height | 800 mm |
| Curb mass | 188 kg |
| Dry mass | - |
| Fuel tank capacity | 15 litres |
| PERFORMANCE | |
|---|---|
| Max. power | 55.0 kW {75 PS} / 14,500 min-1 |
| Max. Power with Ram Air | 56.7 kW {77 PS} / 14,500 min-1 |
| Max. torque | 39.0 N·m {4.0 kgƒ·m} / 13,000 min-1 |
| ENGINE | |
|---|---|
| Type / Valve system | 4-stroke In-Line Four |
| Coolant System | Liquid-cooled |
| Bore x Stroke | 57.0 x 39.1 mm |
| Displacement | 399 cm3 |
| Compression ratio | 12.3:1 |
| Fuel supply | Fuel injection: ø34 mm x 4 |
| Lubrication system | Forced lubrication, wet sump |
| Starting system | EL. Starter |
| Ignition system | Digital |
| DRIVETRAIN | |
|---|---|
| Driving system | Chain |
| Transmission | 6-speed, return |
| Primary reduction ratio | 2.029 (69/34) |
| 1st Gear ratios | 2.929 (41/14) |
| 2st Gear ratios | 2.056 (37/18) |
| 3st Gear ratios | 1.619 (34/21) |
| 4st Gear ratios | 1.333 (32/24) |
| 5st Gear ratios | 1.154 (30/26) |
| 6st Gear ratios | 1.037 (28/27) |
| Final reduction ratio | 3.429 (48/14) |
| Clutch type (Primary) | Wet multi-disc, manual |
| FRAME | |
|---|---|
| Type | Trellis, high-tensile steel |
| Front Suspension | ø37 mm inverted fork (SFF-BP) with top-out springs |
| Rear Suspension | Horizontal Back-link, gas-charged shock with spring preload adjustability |
| Front Wheel travel | 120 mm |
| Rear Wheel travel | 112 mm |
| Caster (Rake angle) | 23.5° |
| Trail | 97 mm |
| Steering angle (left/right) | 35° / 35° |
| Front Tyre | 120/70ZR17M/C (58W) |
| Rear Tyre | 160/60ZR17M/C (69W) |
| Front Type Brake | Dual semi-floating ø290 mm discs |
| Caliper (Front) | Dual radial-mount, monobloc, opposed 4-piston |
| Rear Type Brake | Single ø220 mm disc |
| Caliper (Rear) | Single-piston |
