Kawasaki Zephyr 400 X (2004-08) vs Kawasaki ZZ-R 400 (1990-91) vs Kawasaki GPz 500S EX 500R Ninja (2009) vs Kawasaki ZX-6RR (2003)
Comparison technical specifications
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| Make: | Kawasaki | Kawasaki | Kawasaki | Kawasaki |
| Model: | Zephyr 400 X | ZZ-R 400 | GPz 500S EX 500R Ninja | ZX-6RR |
| Years: | 2004-08 | 1990-91 | 2009 | 2003 |
| Engine: | Four stroke parallel twin cylinder. DOHC, 4 valves per cylinder | Liquid cooled, four stroke, transverse four cylinder, DOHC, 4 valves per cylinder. | Four stroke, parallel twin cylinders. DOHC, 4 valves per cylinder. | Four stroke, transverse four cylinder, DOHC, 4 valves per cylinder. |
| Capacity: | 399 cc / 24.4 cu-in | 398 cc / 24.3 cu-in | 498 cc / 30.4 cu-in | 599 cc / 36.6 cub in |
| Bore x Stroke: | 55 х 42 mm | 57.5 x 38.5 mm | 74 x 58 mm | 67 x 42.5 mm |
| Compression Ratio: | 10.3:1 | 11.8:1 | 10.8:1 | 13.0:1 |
| Induction: | 4X Keihin CVK30 carburetors | 4x Keihin CVK30 carburetors | 2x Keihin CVK34 carburetor | Fuel injection with 38mm throttle bodies |
| Ignition: | Full transistor | Digital | TCI (Transistor Controlled Ignition) | Digital |
| Starting: | Electric | Electric | Electric | Electric |
| Max Power: | 49 hp / 36.8 kW @ 11000 rpm | 58 hp / 43.2 kW @ 12000 rpm | 60 hp / 43.7 kW @ 9800 rpm | 86.8 kW / 118 hp @ 13200 rpm |
| Max Torque: | 3.1 kgf m / 22.4 lb-ft @ 10500 rpm | 3.7 kgf-m / 26.7 lb-ft @ 10000 rpm | 46.1 Nm / 4.7 kg-m @ 8500 rpm | 64.4 Nm / 6.6 kgf-m / 47.5 lb-ft @ 12000 rpm |
| Transmission: | 6 Speed | 6 Speed | 6 Speed | 6 Speed |
| Final Drive: | Chain | Chain | Chain | Chain |
| Front Suspension: | Telescopic forks | 41mm Telescopic forks | 38mm Telescopic forks | 41mm inverted cartridge fork with adjustable preload, stepless rebound and compression damping and top-out springs |
| Rear Suspension: | Dual shocks | Rising rate monoshock | Swinging arm, single shock adjustable for spring preload | Bottom-Link Uni-Trak with gas charged shock, stepless rebound and compression damping, spring preload adjustability and top-out springs |
| Front Brakes: | 2x discs | 2x 300mm discs 4 piston calipers | Single 270mm disc 2 piston caliper | 2 x 280mm discs, 4 piston calipers |
| Rear Brakes: | Single disc | Single 240mm disc 1 piston caliper | Single disc | Single 220mm disc, 1 piston caliper |
| Front Tyre: | 110/80-17 | 120/60-17 | 110/70- 17 | 120/65 ZR17 |
| Rear Tyre: | 140/70-18 | 160/60-17 | 130/70 - 17 | 180/55 ZR17 |
| Wheelbase: | 1435 mm / 56.5 in | 1430 mm / 56.3 in | 1435 mm / 56.4 in | 1400 mm / 55.1 in. |
| Dry Weight: | 179 kg / 395 lbs | 197 kg / 434.3 lbs | 176 kg / 388 lbs | 161 kg / 355 lbs |
| Fuel Capacity: | 14 Litres / 3.6 US gal | 16 Litres / 4.7 US gal | 15.9 Litres / 4.2 US gal | 18 Litres / 4.8 US gal |