Kawasaki ZR-X 400 (2007-08) vs BMW R 50S (1960-62) vs Kawasaki Z 250FT (1980-81)
Comparison technical specifications
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| Make: | Kawasaki | BMW | Kawasaki |
| Model: | ZR-X 400 | R 50S | Z 250FT |
| Years: | 2007-08 | 1960-62 | 1980-81 |
| Engine: | Four stroke parallel twin cylinder. DOHC, 2 valves per cylinder | Four stroke, two cylinder horizontally opposed Boxer, pushrod operated 2 valves per cylinder. | Four stroke, parallel twin, SOHC, 2 valve per cylinder |
| Capacity: | 399 cc / 24.4 cu-in | 494 cc / 30.1 cu in. | 248 cc / 15.1 cub in |
| Bore x Stroke: | 57.5 х 38.5 mm | 68 x 68 mm | 55 х 52.4 mm |
| Cooling System: | Liquid cooled | Air cooled | Air cooled |
| Compression Ratio: | 11.2:1 | 9.5:1 | 10.0:1 |
| Induction: | 4x Keihin CVK30 carburetors | 2 x Bing 1/24/45 - 1/24/46 carburetors | 2 x 32mm Keihin carburetors |
| Ignition: | Transistor | Magneto ignition | CDI |
| Starting: | Electric | Kick | Electric |
| Max Power: | 53 hp / 39.5 kW @ 11500 rpm | 26 kW / 35 hp @ 5800 rpm | 20.1 kW / 27 hp @ 10000 rpm |
| Transmission: | 6 Speed | 4 Speed | 6 Speed |
| Final Drive: | Chain | Shaft | Chain |
| Front Suspension: | 39mm RWU telescopic forks | Telescopic fork | Air assisted telescopic forks, |
| Rear Suspension: | Dual shocks preload adjustment | Long swing arm with suspension units and oil pressure shock absorbers | Spring preload adjustable |
| Front Brakes: | 2x 298mm discs 6 piston calipers | ∅200mm Drum, duplex full hub | Single disc |
| Rear Brakes: | Single 240mm disc 2 piston caliper | ∅200mm Drum, simplex full hub | Drum |
| Front Tyre: | 110/80-17 | 3.50 -18" | 3.00-18 |
| Rear Tyre: | 150/70-18 | 3.50 -18" | 3.50-18 |
| Fuel Capacity: | 16 Litres / 4.2 US gal | 17 liters / 4.49 US gal | 13.5 Litres / 3.6 US gal |