International Specifications
- Engine type Single-cylinder, two stroke, carburettor, liquid cooled.
- Bore and stroke 39.86 x 40 mm
- Engine capacity 49.9cc
- Compression ratio 11.5 :1
- Ignition Electronic with CDI capacity discharge
- Start up Electric
- Lubrication Automatic mixer
- Gearbox 6 Ratios, 1st 11/34, 2nd 15/30, 3rd 18/27, 4th 20/24, 5th 22/23, 6th 23/22
- Primary drive Gears, 21/78
- Final drive Chain, 11/53
- Clutch Multiplate wet clutch
- Frame Twin spar aluminium frame
- Front suspension 41 mm upside down fork, wheel travel 110 mm
- Rear suspension Asymmetric swingarm with monoshock, wheel travel 130 mm
- Brakes Front: 300 mm stainless steel disc with radial 4 piston calliper
- Rear: 218 mm stainless steel disc and calliper with single 30 mm piston
- Wheel rims In light alloy with 6 split spokes, with sealing profile for tubeless tyres; front: 2.75 x 17"; rear: 3.50 x 17"
- Tyres Front: 100/80 - 17", rear: 130/70 - 17"
- Dimensions Max. Length 1953 mm
- Max width 740 mm
- Max height at top fairing 1,138 mm
- Saddle height 820 mm
- Wheelbase 1,350 mm
- Fuel tank capacity 14.5 litres (including 3.5 litre reserve)
- Emissions compliance Euro 2
The summary of the peculiar characteristics of the Aprilia RS4 50:
- - RS4 50 - 50cc 2 stroke single-cylinder engine, liquid cooled with six speed transmission
- - stiff aluminium perimeter frame derived from racing experience
- - 41 mm upside down fork
- - front brake with 300 mm disc and radial four piston calliper
- - Superbike inspired analogue/digital instrument panel
- - fairings derived directly from the RSV4 for total aesthetic coherence with the SBK bike
- - LED taillight