| Engine | Kawasaki Ninja 400 | Kawasaki Ninja 650 |
|---|---|---|
| Displacement | 399 cc | 649 cc |
| Max power | 49 hp (@10 000 RPM) | 71 hp (@8 500 RPM) |
| Max torque | 28 lb ft (@8 000 RPM) | 47 lb ft (@7 000 RPM) |
| Redline | 9 500 RPM | 11 000 RPM |
| Idling speed | 1 200 RPM | 1 200 RPM |
| Management | Fuel Injection | Fuel Injection |
| Layout | DOHC Inline-2 | DOHC Inline-2 |
| Compression | 11.60:1 | 10.80:1 |
| Oil capacity | 2.18 quart | |
| Oil type | 10W40 | |
| Spark plug type | NGK CR9EIA-9 | |
| Cooling | Liquid | Liquid |
| Valves | 8 | 8 |
| Bore | 70.0 mm | 83.0 mm |
| Stroke | 51.8 mm | 60.0 mm |
| Throttle bore | 32.0 mm | 38.0 mm |
| Weight to power | 7.47 lbs/hp | 6.49 lbs/hp |
| Power to weight | 334 hp/2500lbs | 385 hp/2500lbs |
| Battery type | 12V 10Ah |
| Gearbox | Kawasaki Ninja 400 | Kawasaki Ninja 650 |
|---|---|---|
| Type | Sequential | Sequential |
| Clutch | Slipper | Wet |
| Drive | Chain | Chain |
| Chain type | ||
| Gears count | 6 | 6 |
| Primary ratio | 2.219 | 2.095 |
| Final drive | 2.929 | 3.067 |
| 1. gear | 2.929 (36 mph) | 2.438 (52 mph) |
| 2. gear | 2.056 (51 mph) | 1.714 (73 mph) |
| 3. gear | 1.619 (65 mph) | 1.333 (94 mph) |
| 4. gear | 1.333 (78 mph) | 1.111 (112 mph) |
| 5. gear | 1.154 (91 mph) | 0.966 (129 mph) |
| 6. gear | 1.037 (101 mph) | 0.852 (147 mph) |
| Chasis | Kawasaki Ninja 400 | Kawasaki Ninja 650 |
|---|---|---|
| Frame type | Steel trellis frame | Twin-pipe perimiter design, steel |
| Front susp. | 41mm fork, 4.72 in travel | 41mm fork, 4.92 in travel |
| Rear susp. | Monoshock, 5.12 in travel | Monoshock, 5.12 in travel |