| MODEL | KAWASAKI ZX-25R NINJA / SE 2021 |
| Year | 2021 |
| Engine Type | Four stroke, liquid cooled, DOHC, transverse four cylinder, 4 valves per cylinder |
| Displacement / Capacity | 249.8 cc / 15.2 cu in |
| Bore X Stroke | 50.0 x 31.8 mm |
| Compression Ratio | 11.5:1 |
| Cooling System | Liquid cooled |
| Max Power | 37.5 kW / 50 hp @ 15500 rpm (Ram Air) |
| Max Torque | 22.9 Nm / 16.9 lb-ft @ 14500 rpm |
| Ignition | Digital |
| Induction | Fuel injection, 30 mm x 4 |
| Start System | Electric |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 6-speed |
| Clutch | Wet multi-disc, manual |
| Final Drive | Chain, final reduction 3.429 (48/14) |
| CHASSIS SPECS | |
| Frame | High tensile steel trellis |
| Front Suspension | 37 mm inverted fork (SFF-BP), 120 mm / 4.7 in wheel travel |
| Rear Suspension | Horizontal back-link, gas-charged shock with spring preload adjustment, 116 mm / 4.6 in wheel travel |
| Front Brakes | Single 310 mm semi-floating disc, 4-piston caliper |
| Rear Brakes | Single 220 mm disc, 1-piston caliper |
| DIMENSION SPECS | |
| Overall Length | 1980 mm / 77.9 in |
| Overall Width | 750 mm / 29.5 in |
| Overall Height | 1110 mm / 43.7 in |
| Seat Height | — |
| Wheelbase | 1380 mm / 54.3 in |
| Ground Clearance | 125 mm / 4.9 in |
| Dry Weight | — |
| Wet Weight | 180 kg / 396 lb |
| WHEEL SPECS | |
| Front Tyre | 110/70R17M/C (54H) |
| Rear Tyre | 150/60R17M/C (66H) |
| FUEL SYSTEM | |
| Fuel Capacity | 15 litres / 3.9 US gal |
| Fuel Consumption | — |
| Top Speed | — |
The 2021 ZX-25R is Kawasaki's 250 cc sport model, built around a small liquid-cooled four-cylinder that revs hard and sits in a supersport-style fairing. This year it is offered as a base bike and as an SE, and the SE adds ABS, riding modes, a quickshifter and traction control. The chassis is a steel trellis frame with 17-inch wheels and a 310 mm front disc.
