Kawasaki ZX-25R Ninja / SE


Make Model

Kawasaki ZX-25R Ninja / SE




Four stroke, transverse four cylinder, DOHC, 4 valve per cylinder


249.8 cc / cu-in

Bore x Stroke

50.0 x 31.8 mm

Compression Ratio


Cooling System



Fuel injection: 30 mm x 4





Max Power Ram Air

37.5 kW / 50 hp @ 15500 rpm

Max Torque

22.9 Nm / 16.9 lb-ft @ 14500 rpm 


Wet multi-disc, manual


Final Drive Chain

Final Reduction Ratio

3.429 (48/14)
Primary Reduction Ratio 2.900 (87/30)


High tensile steel trellis

Front Suspension

37 mm Inverted fork (SFF-BP)

Front Wheel Travel

120 mm / 4.7

Rear Suspension

Horizontal Back-link, gas-charged shock with spring preload adjustability

Rear Wheel Travel

116 mm / 4.6 in

Front Brakes

Single 310 mm semi-floating disc, 4 piston caliper

Rear Brakes

Single 220 mm disc, 1 piston caliper

ABS System


Front Tyre

110/70R17M/C (54H)

Rear Tyre

150/60R17M/C (66H)




99 mm / 3.9 in


Length 1980 mm / 77.9 in
Width    750 mm / 29.5 in
Height 1110 mm / 43.7 in


1380 mm / 54.3 in

Seat Height


Ground Clearance

125 mm / 4.9 in

Wet Weight

180kg / 396 lbs - SE: 182 Kg / 401 lbs

Fuel Capacity 

15 Litres / 3.9 US gal

Intense In-Line Four Engine

The Ninja ZX-25R is equipped with an all-new engine design – a 250cc, In-Line Four, Liquid Cooled engine – the only one in its class. This new engine delivers performance that eclipses other 250cc models in the field. Direct throttle response and a flexible character that combines strong low-mid range torque for city riding, and intense high-rpm power that can be enjoyed when track riding. High-spec ECU that uses the same base platform as the ZH2, and is loaded with Kawasaki’s latest electronics.

The differences between the base model and the Special Edition are the additions of ABS, selectable riding modes, quick-shifter (both ways), and traction control as standard on the SE.

Kawasaki ZX-25R sports an aggressive stance highlighted by split LED headlamps, muscular 15-litre fuel tank, step-up style seats, and black aesthetics.  The ZX-25R comes equipped with a semi-digital instrument panel that includes an analogue tachometer and a digital display for other essential readouts.

The 250 cc, liquid-cooled, in-line four-cylinder engine that is coupled to a six-speed transmission of the Ninja ZX-25R makes 50hp (37.5 kW) with Kawasaki’s dubious “RAM Air” power rating, which in normal numbers should mean a 49hp, with 16.9 lbs-ft / 22.9 Nm of peak torque.

Curb weight is 180kg / 396 lbs for the base model, and 182kg / 401 lbs for the ABS SE model.

WSBK-inspired Chassis

Key chassis dimensions were inspired by Kawasaki’s World Superbike Ninja ZX-10RR racing bike. 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 nimble super sport-style handling.

The Ninja ZX-25R also comes with an arched swing-arm design. This swing-arm design enables the short silencer to be positioned more centrally, contributing to better balance, and adding to its stylish, sporty looks.

Showa SFF-BP Front Fork

The Ninja ZX-25R’s 37mm inverted front fork uses a Showa SFF-BP (Separate Function Fork – Big Piston) front suspension with 120 mm wheel-travel. This offers riders the convenience of having separate adjustments to the damping and rebound (vs traditional suspension systems that combine both in both forks). This advanced fork offers both racetrack performance and everyday usability. The first ever time that this feature us used on the 250cc class.

The rear suspension is a horizontal back link mono-shock with pre-load adjustability and 116 mm wheel-travel

Kawasaki Traction Control

The Ninja ZX-25R is the first 250cc model to feature traction control. Provides enhanced sport riding performance and peace of mind under certain riding conditions to prevent accidents on low-traction surfaces. Comes in three modes. Mode 1 is for near perfect road conditions, Mode 2 is for normal riding conditions, and Mode 3 is for highly slippery conditions. Modes 1 and 2 prioritize maximum acceleration, while Mode 3 prioritizes maximum stability.