Specification sheet — Kawasaki
Kawasaki Ninja ZX-25R specifications
The 250 cc inline-four supersport, with a peak power figure quoted at 15,500 rpm.
- Displacement
- 249.8 cc
- Peak power
- 35.2 kW (47 PS) / 15,500 rpm (with Ram Air)
- Peak torque
- 22.0 N·m (2.2 kgf·m) / 12,500 rpm
- Curb weight
- 180 kg
- Seat height
- 785 mm
- Fuel tank
- 15 L
Overview
The published sheet lists a 249.8 cc engine, peak power of 35.2 kW (47 PS) / 15,500 rpm (with Ram Air), peak torque of 22.0 N·m (2.2 kgf·m) / 12,500 rpm. It carries a curb weight of 180 kg, a 785 mm seat height and a 15 L tank.
On the published figures it works out to 19.6 kW per 100 kg, above the median for the other 5 sport bikes in this database (15.9 kW per 100 kg).
Market and trim notes
This sheet covers the Kawasaki Ninja ZX-25R as listed in the Indonesian distributor’s current catalogue. Market-specific equipment can differ from the same nameplate in another country, so the figures are not interchangeable.
The power figure is quoted with ram-air; the source also lists a lower figure without it.
Full specification
Every row below is a published figure. Rows the manufacturer does not publish are marked rather than estimated.
Engine and performance
| Engine type | Liquid-cooled, 4-stroke In-Line Four |
|---|---|
| Displacement | 249.8 cc |
| Bore × stroke | 50.0 x 31.8 mm |
| Compression ratio | 12.5:1 |
| Cooling | Liquid derived |
| Fuel system | Fuel injection: ø30 mm x 4 |
| Maximum power | 35.2 kW (47 PS) / 15,500 rpm (with Ram Air) |
| Maximum torque | 22.0 N·m (2.2 kgf·m) / 12,500 rpm |
| Starting | Electric |
| Ignition | Digital |
Transmission and final drive
| Transmission | 6-speed, return |
|---|---|
| Clutch | Wet multi-disc, manual |
| Final drive | Chain |
Chassis, suspension and brakes
| Frame | 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 brake | Semi-floating ø310 mm disc |
| Rear brake | ø220 mm disc |
| Front tyre | 110/70R17M/C 54H |
| Rear tyre | 150/60R17M/C 66H |
Dimensions, weight and capacity
| Length × width × height | 1,980 x 750 x 1,110 mm |
|---|---|
| Wheelbase | 1,380 mm |
| Ground clearance | 125 mm |
| Seat height | 785 mm |
| Curb weight | 180 kg |
| Fuel tank | 15 L |
What the numbers mean
The 785 mm seat is a middle-of-the-road height: most riders will get the balls of both feet down.
At 180 kg it is a two-person job to move uphill; plan parking before you stop.
The 15 L tank is touring-sized, which matters more on a bike that can sit at highway speed. The manufacturer does not publish a consumption figure, so this page does not quote a range.
Tyres are 110/70R17M/C 54H front and 150/60R17M/C 66H rear. Check that your local shop stocks both before a long trip.
Closest alternatives
| Model | Capacity | Power | Torque | Weight | Seat |
|---|---|---|---|---|---|
| Kawasaki Ninja 250 | 249 cc | 26.5 kW (36 PS) / 12,500 rpm | 22.0 N·m (2.2 kgf·m) / 10,500 rpm | 163 kg | 795 mm |
| Kawasaki Ninja ZX-4RR | 399 cc | 56.7 kW (77 PS) / 14,500 rpm (with Ram Air) | 37.6 N·m (3.8 kgf·m) / 12,500 rpm | 189 kg | 800 mm |
| Kawasaki Ninja ZX-6R | 636 cc | 95.2 kW (129 PS) / 13,000 rpm (with Ram Air) | 69.0 N·m (7.0 kgf·m) / 11,000 rpm | 198 kg | 830 mm |
Nearest alternatives by category and capacity in this database. These are published figures, not a road test or a recommendation.
Ownership and maintenance notes
- Clean and lubricate the chain at short intervals in rain or dust, and check slack with the bike on its side stand. A loose chain wears sprockets quickly; a tight one loads the output bearing.
- Check tyre pressures cold. On a light bike a few psi matters more than it does on a car, and it changes both steering and tyre life.
- Liquid cooling adds a coolant level and condition check. Do it when the engine is cold, and never open the radiator cap on a hot engine.
- A high-specific-output engine rewards correct oil level and valve-clearance checks. Do not stretch the service interval because the bike feels fine.
- A 250 cc four-cylinder revs far higher than a twin. Valve clearance, oil quality and chain tension matter more than on a commuter, and the service interval should be followed closely.
Source and verification
Figures are taken from Kawasaki Motor Indonesia, the Indonesian distributor, on 13 November 2026.
Source page: kawasaki-motor.co.id/id-id/sepeda-motor/ninja/supersport/ninja-zx-25r/2027-ninja-zx-25r.
The source page is the 2027 model-year page.
Cooling is inferred from the published layout rather than printed as a separate field.
Wording is quoted as published; spacing and unit symbols are normalised. Specification databases go stale: if a figure here differs from the current distributor page, the distributor page wins, and this sheet records what was published on the verification date.
