Kawasaki Z 400 (1980-81) vs Aprilia SX 50 (2010-12)
Comparison technical specifications
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| Make: | Kawasaki | Aprilia |
| Model: | Z 400 | SX 50 |
| Years: | 1980-81 | 2010-12 |
| Engine: | Four stroke, parallel twin cylinder, SOHC, 2 Valve per cylinder. | Single cylinder, two stroke |
| Capacity: | 398 cc / 24.2 cu-in | 49.9 cc / 3.04 cu in |
| Bore x Stroke: | 64 х 62 mm | 39.9 x 40 mm |
| Compression Ratio: | 9.4:1 | 11.5:1 |
| Cooling System: | Air cooled | Liquid cooled |
| Lubrication: | Forced lubrication, wet sump | Automatic mixer |
| Induction: | 2x Keihin CV32 6caburetor | Dell'Orto PVHA 17.5 carburetor |
| Ignition: | Battery & coil | Electronic CDI |
| Starting: | Electric | Kick |
| Transmission: | 5 Speed | 6 speed |
| Final Drive: | Chain | Chain |
| Frame: | Tubular, double cradle | Steel beam |
| Front Suspension: | Telescopic fork | Hydraulic fork, Ø 40 mm |
| Rear Suspension: | Swing arm | High strength steel swingarm, hydraulic monoshock |
| Front Brakes: | Single 226mm disc | Single stainless steel disc, Ø 260 mm, floating caliper |
| Rear Brakes: | 180mm Drum | Single disc, Ø 180 mm, floating caliper |
| Front Tyre: | 3.25 - S18 4PR | 100/80 ZR17 |
| Rear Tyre: | 3.50 - SIB 4PR | 130/70 ZR17 |
| Dimensions: | Length 2080 mm / 81.9 in Width 775 mm / 30.5 in Length 1050 mm / 41.3 in | Length: 2045 mm / 80.5 in Width: 835 mm / 32.5 in |
| Wheelbase: | 1370 mm / 53.9 In | 1400 mm / 55.1 in |
| Dry Weight: | 175 kg / 386 lbs | 98 kg / 216 lbs |
| Fuel Capacity: | 14 Litres / 3.6 US gal | 7 L / 1.85 US gal |