Kawasaki Z 400 (1980-81) vs Aprilia SX 50 (2010-12) vs BMW R 50S (1960-62)
Comparison technical specifications
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| Make: | Kawasaki | Aprilia | BMW |
| Model: | Z 400 | SX 50 | R 50S |
| Years: | 1980-81 | 2010-12 | 1960-62 |
| Engine: | Four stroke, parallel twin cylinder, SOHC, 2 Valve per cylinder. | Single cylinder, two stroke | Four stroke, two cylinder horizontally opposed Boxer, pushrod operated 2 valves per cylinder. |
| Capacity: | 398 cc / 24.2 cu-in | 49.9 cc / 3.04 cu in | 494 cc / 30.1 cu in. |
| Bore x Stroke: | 64 х 62 mm | 39.9 x 40 mm | 68 x 68 mm |
| Compression Ratio: | 9.4:1 | 11.5:1 | 9.5:1 |
| Cooling System: | Air cooled | Liquid cooled | Air cooled |
| Induction: | 2x Keihin CV32 6caburetor | Dell'Orto PVHA 17.5 carburetor | 2 x Bing 1/24/45 - 1/24/46 carburetors |
| Ignition: | Battery & coil | Electronic CDI | Magneto ignition |
| Starting: | Electric | Kick | Kick |
| Transmission: | 5 Speed | 6 speed | 4 Speed |
| Final Drive: | Chain | Chain | Shaft |
| Frame: | Tubular, double cradle | Steel beam | Double loop steel tubular frame |
| Front Suspension: | Telescopic fork | Hydraulic fork, Ø 40 mm | Telescopic fork |
| Rear Suspension: | Swing arm | High strength steel swingarm, hydraulic monoshock | Long swing arm with suspension units and oil pressure shock absorbers |
| Front Brakes: | Single 226mm disc | Single stainless steel disc, Ø 260 mm, floating caliper | ∅200mm Drum, duplex full hub |
| Rear Brakes: | 180mm Drum | Single disc, Ø 180 mm, floating caliper | ∅200mm Drum, simplex full hub |
| Front Tyre: | 3.25 - S18 4PR | 100/80 ZR17 | 3.50 -18" |
| Rear Tyre: | 3.50 - SIB 4PR | 130/70 ZR17 | 3.50 -18" |
| Fuel Capacity: | 14 Litres / 3.6 US gal | 7 L / 1.85 US gal | 17 liters / 4.49 US gal |