| Engine | Kawasaki Ninja 300 | Kawasaki Ninja 400 |
|---|---|---|
| Displacement | 296 cc | 399 cc |
| Max power | 39 hp (@11 000 RPM) | 49 hp (@10 000 RPM) |
| Max torque | 19 lb ft (@10 000 RPM) | 28 lb ft (@8 000 RPM) |
| Redline | 13 000 RPM | 9 500 RPM |
| Idling speed | 1 200 RPM | |
| Management | Fuel Injection | Fuel Injection |
| Layout | DOHC Inline-2 | DOHC Inline-2 |
| Compression | 10.60:1 | 11.60:1 |
| Oil capacity | 2.27 quart | |
| Oil type | 10W40, Motul 300V 10W40, Shell Rotella 10W40 | |
| Spark plug type | NGK CR8E | |
| Cooling | Liquid | Liquid |
| Valves | 8 | 8 |
| Bore | 62.0 mm | 70.0 mm |
| Stroke | 49.0 mm | 51.8 mm |
| Throttle bore | 32.0 mm | |
| Weight to power | 9.84 lbs/hp | 7.47 lbs/hp |
| Power to weight | 254 hp/2500lbs | 334 hp/2500lbs |
| Battery type | 12V 8Ah |
| Gearbox | Kawasaki Ninja 300 | Kawasaki Ninja 400 |
|---|---|---|
| Type | Sequential | Sequential |
| Clutch | Wet | Slipper |
| Drive | Chain | Chain |
| Chain type | ||
| Gears count | 6 | 6 |
| Primary ratio | 3.087 | 2.219 |
| Final drive | 3.0 | 2.929 |
| 1. gear | 2.714 (38 mph) | 2.929 (36 mph) |
| 2. gear | 1.789 (58 mph) | 2.056 (51 mph) |
| 3. gear | 1.409 (73 mph) | 1.619 (65 mph) |
| 4. gear | 1.16 (89 mph) | 1.333 (78 mph) |
| 5. gear | 1.0 (103 mph) | 1.154 (91 mph) |
| 6. gear | 0.857 (120 mph) | 1.037 (101 mph) |
| Chasis | Kawasaki Ninja 300 | Kawasaki Ninja 400 |
|---|---|---|
| Frame type | Diamond, steel | Steel trellis frame |
| Front susp. | Telescopic fork, 4.72 in travel | 41mm fork, 4.72 in travel |
| Rear susp. | Swingarm (uni-trak) 132mm wheel travel | Monoshock, 5.12 in travel |