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| Model | Aprilia RS4 125 |
| Year | 2014 |
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| Displacement | 124.8 ccm (7.62 cubic inches) |
| Engine type | Single cylinder, four-stroke |
| Power | 15.0 HP (10.9 kW) @ 10500 RPM |
| Torque | 10.9 Nm (1.1 kgf-m or 8.0 ft.lbs) @ 8250 RPM |
| Compression | 12.5:1 |
| Bore x stroke | 58.0 x 47.0 mm (2.3 x 1.9 inches) |
| Valves per cylinder | 4 |
| Fuel system | Injection |
| Ignition | Electronic with CDI capacity discharge |
| Lubrication system | Wet sump |
| Cooling system | Liquid |
| Gearbox | 6-speed |
| Transmission type | Chain (final drive) |
| Clutch | Multi-plate in oil bath. |
| Driveline | Primary drive: Gearbox: 63/19 (3.31). Final drive: Chain: 17/40 (2.35). |
| Emission details | Euro 3 |
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| Frame type | Aluminium perimeter frame |
| Front suspension | Upside down hydraulic fork, 40 mm. |
| Front wheel travel | 110 mm (4.3 inches) |
| Rear suspension | Swingarm. Hydraulic monoshock with adjustable spring preload. |
| Rear wheel travel | 122 mm (4.8 inches) |
| Front tire | 110/80-R17 |
| Rear tire | 130/70-R17 |
| Front brakes | Single disc. Stainless steel disc with radial 4 piston calliper |
| Diameter | 300 mm (11.8 inches) |
| Rear brakes | Single disc. Single 30 mm piston |
| Diameter | 220 mm (8.7 inches) |
| Wheels | Light alloy with 6 split spokes |
| Weight incl. oil, gas, etc | 120.0 kg (264.6 pounds) |
| Seat height | 820 mm (32.3 inches) If adjustable, lowest setting. |
| Overall height | 1138 mm (44.8 inches) |
| Overall length | 1955 mm (77.0 inches) |
| Overall width | 740 mm (29.1 inches) |
| Wheelbase | 1350 mm (53.1 inches) |
| Fuel capacity | 14.50 litres (3.83 US gallons) |
| Reserve fuel capacity | 3.50 litres (0.92 US gallons) |
