Kawasaki ZX-6R (2008) vs Aprilia RS4 50 Replica (2010-11) vs Aprilia RS 125 R Full White (2010)
Comparison technical specifications
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| Make: | Kawasaki | Aprilia | Aprilia |
| Model: | ZX-6R | RS4 50 Replica | RS 125 R Full White |
| Years: | 2008 | 2010-11 | 2010 |
| Engine: | Four stroke, transverse four cylinder, DOHC, 4 valves per cylinder | Two stroke, single cylinder, DOHC, 4-valve | Single cylinder, two stroke, reed valves induction, aluminium cylinder with Nikasil coated liner |
| Capacity: | 599 cc / 36.6 cub in | 49.9 cc / 3.05 cub in. | 124.8 cc / 7.5 cu in |
| Bore x Stroke: | 67 x 42.5 mm | 39.9 x 39.9 mm | 54 x 54.5mm |
| Compression Ratio: | 13.9:1 | 11.5:1 | 12.5:1 |
| Cooling System: | Liquid cooled | Liquid cooled | Liquid cooled |
| Lubrication: | Wet sump | Automatix mixer | Separate mixing, volumetric pump |
| Ignition: | TCBI with Digital advance | CDI | CDI electronic ignition |
| Starting: | Electric | Electric | Electric |
| Clutch: | Wet, multiple discs, cable operated | Multiple discs in oil bath | Wet, multi-disc |
| Transmission: | 6 Speed | 6-Speed | 6 Speed |
| Final Drive: | X-ring chain | Chain | 17:40 |
| Frame: | Perimeter, pressed-aluminium | Aluminium | Cast aluminium, reinforced box section, sloping twin-spar frame |
| Front Suspension: | 41 mm inverted cartridge fork with top-out springs, stepless rebound damping, stepless compression damping, fully-adjustable spring preload | Upside down fork, Ø41 mm | Upside-down forks, Ø 40mm |
| Front Wheel Travel: | 120 mm / 4.5 in | 110 mm / 4.3 in. | 120 mm / 4.7 in |
| Rear Suspension: | Bottom-Link Uni-Trak® with gas-charged shock, top-out spring and pillow ball upper mount, dual-range (high/low-speed) stepless compression damping, 25-way Adjustable rebound damping, fully-adjustable spring preload | Asymmetric swingarm, monoshock | Monoshock, cast aluminium box section swingarm with asymmetric members |
| Rear Wheel Travel: | 133 mm / 5.2 in | 122 mm / 4.8 in. | 120 mm / 4.7 in |
| Front Brakes: | 2 x 300mm discs, 4 piston calipers | Stainless steel disc, Ø 300 mm, 4-piston radial caliper | Single 320 mm floating discs, 4 piston radial caliper |
| Rear Brakes: | Single 210mm disc, 1 piston caliper | Stainless steel disc, Ø 218 mm, single piston caliper | Single 220 mm disc, 2 piston caliper |
| Front Tyre: | 120/65 ZR17 | 110/80-17 | 110/70-17 |
| Rear Tyre: | 180/55 ZR17 | 130/70-17 | 150/60-17 |
| Dimensions: | Length 2105 mm / 2.8 in Width 720 mm / 28.2 in Height 1125 mm / 44.2 in | Length: 1953 mm / 76.9 in Width: 740 mm / 29.1 in Height: 1138 mm / 44.8 in | Length: 1955 mm / 77.0 in Width: 720 mm / 28.3 in Height: 1100 mm / 43.3 in |
| Wheelbase: | 1405 mm / 55.3 in. | 1350 mm / 53.1 in | 1345 mm / 53.0 in |
| Seat Height: | 820 mm / 32.3 in. | 820 mm / 32.3 in. | 805 mm / 31.7 in |
| Fuel Capacity: | 17 Litres / 4.5 US gal | 14.5 Litres / 3.8 US gal | 14 Litres / 3.7 US gal |
| Top Speed: | 252.1 km/h / 156.4 mph | 96.6 km/h / 60 mph | 155 km/h / 96 mph |