The 2009 RS 125 kept the 2006-generation package: a Rotax-built 124.8 cc reed-valve two-stroke single in a cast aluminium twin-spar frame, with a…
| MODEL | APRILIA RS 125 2009 |
| Year | 2009 |
| Engine Type | Single cylinder, two stroke, reed valve induction, aluminium cylinder with Nikasil coated liner |
| Displacement / Capacity | 124.8 cc / 7.5 cu in |
| Bore X Stroke | 54 x 54.5 mm |
| Compression Ratio | 12.5:1 |
| Cooling System | Liquid cooled |
| Max Power | 21 kW / 28 hp @ 10500 rpm |
| Max Torque | 19 Nm / 1.9 kgf-m / 14.1 lb-ft @ 9000 rpm |
| Ignition | CDI electronic ignition |
| Induction | Dell'Orto PHBH 28 carburettor |
| Start System | Electric |
| TRANSMISSION SPECS | |
| Lubrication | Separate mixing, volumetric pump |
| Gear Box | 6 Speed |
| Clutch | Wet, multi-disc |
| Final Drive | Chain (17:40) |
| CHASSIS SPECS | |
| Frame | Cast aluminium, reinforced box section, sloping twin-spar frame |
| Front Suspension | 40 mm upside-down fork, 120 mm / 4.7 in wheel travel |
| Rear Suspension | Monoshock, cast aluminium box-section swingarm with asymmetric members, 120 mm / 4.7 in wheel travel |
| Front Brakes | Single 320 mm floating disc, 4-piston radial caliper |
| Rear Brakes | Single 220 mm disc, 2-piston caliper |
| DIMENSION SPECS | |
| Overall Length | 1955 mm / 77.0 in |
| Overall Width | 720 mm / 28.3 in |
| Overall Height | 1100 mm / 43.3 in |
| Seat Height | 805 mm / 31.7 in |
| Wheelbase | 1345 mm / 53.0 in |
| Ground Clearance | — |
| Dry Weight | 127 kg / 280 lbs |
| Wet Weight | 142 kg / 313 lbs |
| WHEEL SPECS | |
| Front Tyre | 110/70-17 |
| Rear Tyre | 150/60-17 |
| FUEL SYSTEM | |
| Fuel Capacity | 14 Litres / 3.7 US gal |
| Fuel Consumption | — |
| Top Speed | 155 km/h / 96 mph |
The 2009 RS 125 kept the 2006-generation package: a Rotax-built 124.8 cc reed-valve two-stroke single in a cast aluminium twin-spar frame, with a radial-mount front caliper and a 40 mm upside-down fork. It remained the benchmark small sportbike and a Sport Production racing favourite, and Italian magazine Motociclismo voted it the best bike in its class for 2009. Output depended on market: 28 hp is the unrestricted figure, while European A1-licence bikes were listed at about 15 hp.
