Kawasaki Z 650 (2022) vs Aprilia SX 125 (2011) vs Kawasaki Z 550F (1983)
Comparison technical specifications
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| Make: | Kawasaki | Aprilia | Kawasaki |
| Model: | Z 650 | SX 125 | Z 550F |
| Years: | 2022 | 2011 | 1983 |
| Engine: | Four stroke, parallel twin cylinder, DOHC, 4 valves per cylinder | Four stroke, Single cylinder, DOHC, 4 valve | Four stroke, transverse four cylinder, DOHC, 2 valve per cylinder. |
| Capacity: | 649 cc / 39.65 cu-in | 124.2 cc / 7.6 cu-in | 553 cc / 33.7 cu-in |
| Bore x Stroke: | 83 x 60 mm | 58 x 47 mm | 58 x 52.4 mm |
| Cooling System: | Liquid cooled | Liquid cooled | Air cooled |
| Compression Ratio: | 10.8:1 | 12.6:1 | 9.5:1 |
| Induction: | DFI® with Keihin 36mm Keihin throttle bodies | Fuel injection. ECU Electronics Magneti Marelli MIUG4 32 mm | 4x 22mm TK |
| Ignition: | TCBI with electronic advance | Electronic CDI | CDI |
| Starting: | Electric | Electric | Electric |
| Max Power: | 50.2 kW / 67.3 hp | 14.8 hp / 11 kW @ 10000 rpm | 58 hp / 43.2 kW @ 9000 rpm |
| Max Torque: | 65.7 Nm / 48.5 lb-ft @ 6500 rpm | 11.2 Nm / 8.3 lb-ft @ 8000 rpm | 35.5 ft-lb / 48.1 Nm @ 7000 rpm |
| Transmission: | 6 Speed | 6 Speed | 6 Speed |
| Final Drive: | Sealed chain | Chain, drive ratio: 13/62 | Chain |
| Front Suspension: | 41 mm hydraulic telescopic fork | 41mm Stanchions upside down fork | 36mm Telescopic forks |
| Front Wheel Travel: | 125 mm / 4.9 in | 240 mm / 9.4 in | 173 mm / 6.8 in |
| Rear Suspension: | Horizontal Back-link with adjustable preload swingarm | Steel swingarm, monoshock with progressive link system | Dual shock, 5-way preload |
| Rear Wheel Travel: | 130 mm / 5.1 in | 210 mm / 8.3 in | 109 mm / 4.9 in |
| Front Brakes: | 2x 300mm petal-style discs, 2 piston calipers | Single 300mm disc floating caliper | 2X 250mm disc |
| Rear Brakes: | Single 220mm petal-style disc | Single 220 mm disc floating caliper | Single disc |
| Front Tyre: | 120/70 ZR17 | 100/80-17 | 3.25-19 |
| Rear Tyre: | 160/60 ZR7 | 130/70-17 | 3.75-18 |
| Fuel Capacity: | 15 Litres / 4.0 US gal | 7 Litres / 1.84 US gal | 14 Litres / 3.6 US gal |