Since the arrival of the 2008 Ninja 250R, the 250cc full-fairing sports class has been dominated by Twins. But a new contender for the 250cc crown has arrived. Kawasaki is proud to present the Ninja ZX-25R, an all-new 250cc supersport model powered by the only In-Line Four engine in its class. A shining example of the performance offered by Ninja ZX machines, this long-awaited model was created for discerning, sports-minded customers longing for a racy street machine with high circuit-riding potential.
Kawasaki’s compact new 249 cm3 liquid-cooled DOHC In-Line Four engine is the only one of its kind in the 250cc class. Developed with feedback from other Ninja ZX models, the high-performance engine offers class-leading power and a rev-range that extends beyond 17,000 min-1.
A trademark feature of Kawasaki’s Ninja ZX models, the centrally positioned Ram Air duct system, designed with feedback from the Ninja H2, improves filling efficiency, contributing to increased engine performance.
Designed using Kawasaki’s advanced dynamic rigidity analysis, the all-new lightweight trellis frame delivers the required balance of strength and chassis flex to achieve the Ninja ZX- 25R’s nimble supersport-style handling.
The Ninja ZX-25R’s ø37 mm inverted fork uses SFF-BP internals. Combining the concepts of Showa SFF and BPF, this advanced fork offers both racetrack performance and everyday usability. At the rear, Horizontal Back-link rear suspension offers a progressive character that contributes to the bike’s supersport-style handling. Making its debut in the 250cc class, this arrangement is similar to that seen on the Ninja ZX-10R.
The Ninja ZX-25R is the first 250cc model to feature traction control. Kawasaki's advanced system provides both enhanced sport riding performance and the peace of mind under certain conditions to negotiate low-traction surfaces with confidence. Three rider-selectable modes offer progressively greater levels of intrusion to suit the riding situation and rider preference.
Allowing riders to take even greater advantage of the Ninja ZX-25R’s exhilarating engine character, the quick shifter - a first for the 250cc class - enables clutchless upshifts and downshifts for seamless acceleration and quick and easy deceleration.
Smooth-shifting six-speed transmission offers a gear for every occasion, but are especially well suited to accelerating out of corners when sport or track riding. The Assist & Slipper Clutch was developed based on feedback from racing activities. The clutch uses two types of cams (an assist cam and a slipper cam), offering two functions not available on a standard clutch.
Kawasaki’s compact new 249 cm3 liquid-cooled DOHC In-Line Four engine is the only one of its kind in the 250cc class. Developed with feedback from other Ninja ZX models, the high-performance engine offers class-leading power and a rev-range that extends beyond 17,000 min-1.
A trademark feature of Kawasaki’s Ninja ZX models, the centrally positioned Ram Air duct system, designed with feedback from the Ninja H2, improves filling efficiency, contributing to increased engine performance.
Designed using Kawasaki’s advanced dynamic rigidity analysis, the all-new lightweight trellis frame delivers the required balance of strength and chassis flex to achieve the Ninja ZX- 25R’s nimble supersport-style handling.
The Ninja ZX-25R’s ø37 mm inverted fork uses SFF-BP internals. Combining the concepts of Showa SFF and BPF, this advanced fork offers both racetrack performance and everyday usability. At the rear, Horizontal Back-link rear suspension offers a progressive character that contributes to the bike’s supersport-style handling. Making its debut in the 250cc class, this arrangement is similar to that seen on the Ninja ZX-10R.
The Ninja ZX-25R is the first 250cc model to feature traction control. Kawasaki's advanced system provides both enhanced sport riding performance and the peace of mind under certain conditions to negotiate low-traction surfaces with confidence. Three rider-selectable modes offer progressively greater levels of intrusion to suit the riding situation and rider preference.
Allowing riders to take even greater advantage of the Ninja ZX-25R’s exhilarating engine character, the quick shifter - a first for the 250cc class - enables clutchless upshifts and downshifts for seamless acceleration and quick and easy deceleration.
Smooth-shifting six-speed transmission offers a gear for every occasion, but are especially well suited to accelerating out of corners when sport or track riding. The Assist & Slipper Clutch was developed based on feedback from racing activities. The clutch uses two types of cams (an assist cam and a slipper cam), offering two functions not available on a standard clutch.
| DIMENSIONS | |
|---|---|
| Overall length | 1,980 mm |
| Overall width | 750 mm |
| Overall height | 1,110 mm |
| Wheelbase | 1,380 mm |
| Road clearance | 125 mm |
| Seat height | 785 mm |
| Curb mass | 184 kg |
| Dry mass | - |
| Fuel tank capacity | 15 litres |
| PERFORMANCE | |
|---|---|
| Max. power | 34.5 kW { 46 PS} / 15,500 min-1 |
| Max. Power with Ram Air | 35.2 kW { 47 PS} / 15,500 min-1 |
| Max. torque | 22.0 N·m {2.2 kgƒ·m} / 12,500 min-1 |
| ENGINE | |
|---|---|
| Type / Valve system | 4-stroke In-Line Four |
| Coolant System | Liquid-cooled |
| Bore x Stroke | 50.0 x 31.8 mm |
| Displacement | 250 cc |
| Compression ratio | 11.5:1 |
| Fuel supply | Fuel injection: (ø30 x 4) |
| Lubrication system | Forced Wet Sump |
| Starting system | EL. Starter |
| Ignition system | Digital |
| DRIVETRAIN | |
|---|---|
| Driving system | Chain |
| Transmission | 6-speed, return, dog-ring |
| Primary reduction ratio | 2.900 (87/30) |
| 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 | 3.571 (50/14) |
| Clutch type (Primary) | Wet, multi-disc |
| 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 | 116 mm |
| Caster (Rake angle) | 24.2 o |
| Trail | 99 mm |
| Steering angle (left/right) | 35° / 35° |
| Front Tyre | 110/70R17M/C (54H) |
| Rear Tyre | 150/60R17M/C (66H) |
| Front Type Brake | Single disc |
| Caliper (Front) | |
| Rear Type Brake | Single disc |
| Caliper (Rear) | |
