2006 Aprilia RS 125 R

Make Model	Aprilia RS 125 R
Year	2006
Engine	Single cylinder, two stroke, reed valves induction
Capacity	124.8 cc / 7.5 cu in
Bore x Stroke	54 x 54.5mm
Compression Ratio	12.5:1
Cooling System	Liquid cooled
Lubrication	Separate mixing, volumetric pump
Induction	Dell'Orto PHBH 28 carburetor
Ignition	CDI electronic ignition
Starting	Electric
Alternator	12V, 180W
Max Power	21 kW / 28 hp @ 10500 rpm
Max Torque	19 Nm / 1.9 kgf-m / 14.1 lb-ft @ 9000 rpm
Clutch	Wet, multi-disc
Transmission	6 Speed
Final Drive	Chain
Gear Ratios	1st 10:30 / 2nd 14:29 / 3rd 17:27 / 4th 19:25 / 5th 21:24 / 6th 22:23
Primary Drive	63:19
Final Drive	17:40
Frame	Cast aluminium, reinforced box section, sloping twin-spar frame
Front Suspension	Upside-down forks, Ø 40mm
Front Wheel Travel	120 mm / 4.7 in
Rear Suspension	Monoshock, cast aluminium box section swingarm with asymmetric members
Rear Wheel Travel	120 mm / 4.7 in
Front Brakes	Single 320 mm floating discs, 4 piston radial caliper
Rear Brakes	Single 220 mm disc, 2 piston caliper
Wheels	Aluminium alloy
Front Rim	3.00 x 17
Rear Rim	4.00 x 17
Front Tyre	110/70-17
Rear Tyre	150/60-17
Dimensions	Length: 1955 mm / 77.0 in Width: 720 mm / 28.3 in Height: 1100 mm / 43.3 in
Wheelbase	1345 mm / 53.0 in
Seat Height	805 mm / 31.7 in
Dry Weight	115 kg / 254 lbs
Wet Weight	142 kg / 313 lbs
Fuel Capacity	14 L / 3.7 US gal
Top Speed	155 km/h / 96 mph
Colours	Aprilia Black, GP Aprilia White

styling of the RS is based on that of the RSV 1000 R and, as with all Aprilia sports bikes, is the result of painstaking aerodynamic research. The new fairing, for example, was perfected by extensive wind tunnel testing, to guarantee GP class wind protection and minimum drag, and to obtain maximum racetrack efficiency from the small engine. The fairing, windshield and tail not only look mean and aggressive, but allow the RS 125 to reach a blistering top speed, eliminating the turbulence that can disturb rider concentration. Man and machine really can become one when the machine in question is an Aprilia RS 125.

The latest generation twin halogen headlight also adds to the mean look of the new RS, and delivers a high power light beam for enhanced visibility and safety at night.

The sleek tail also houses a new light cluster with a pure racing look. In fact, a great deal of effort has been put into all aspects of design of the RS 125 tail. As a result, the passenger seat integrates perfectly with the silhouette of the bike.

Because the new, crossed spoke wheel design is lighter, more reliable and safer, it also improves sports performance.

The powerful but reliable, single cylinder, two stroke, Rotax-Aprilia engine needs no introduction. Over the years it has won a reputation for being unbeatable on the track and dependable on the road. Still today, this engine boasts technical solutions that are state-of-the-art for two strokes, including a crankcase reed valve intake, liquid cooling, an anti-vibration balancer shaft, and an automatic mixing system. The RS 125’s engine has been constantly updated over the years to keep in line with the latest emission control legislation without penalising performance. A catalytic converter and precision carburation enable Aprilia’s single cylinder two stroke to sail through homologation to Euro 2 standards. And the amazing thing is that this has been achieved without losing out on performance: in fact the engine that powers the Aprilia RS 125 remains the reference point for all 125 cc engines in terms of sheer power.

Without a doubt, the most advanced single component on the RS 125 is its frame. Developed from Aprilia’s vast experience in GP 125 racing, the RS 125 frame is made from cast aluminium alloy with cross-ribbing reinforcement. Despite its extremely light weight, this advanced structure achieves amazing torsional rigidity, setting the standards for Aprilia’s competitors.

The box section, aluminium alloy swingarm has the highest torsional rigidity of all production 125 cc swingarms. Its asymmetric design enables the exhaust to pass extremely close to the body of the motorcycle, enabling more acute angles of lean to be achieved on bends without risking dangerous contact with the asphalt.
The suspension too plays a fundamental role in ensuring not only the RS 125’s performance, but its safety and comfort too. The 2006 RS 125 boasts better suspension than ever before. The upside-down fork has been thoroughly redesigned for maximum performance on the racetrack while also delivering a more satisfying ride on public roads.

The rear suspension features rising rate linkages based on Aprilia’s racing technology, for excellent traction and superb comfort even over uneven road surfaces. The hydraulic monoshock that provides the damping for the swingarm is also adjustable in spring preload.

Like any self-respecting supersport motorcycle, the RS 125 has to have the best when it comes to components. The braking system is brand new, and designed for maximum efficiency under competitive riding conditions. The front brakes use a radial caliper with four opposed pistons, in keeping with the latest trends in racing technology. In addition to the 320 mm front disc, the system also incorporates a radial master cylinder and aeronautical hoses for maximum precision and unrivalled braking power. The rear disc is 220 mm in diameter and is also equipped with metal braided hoses for perfectly balanced braking under difficult race conditions.

The world’s top racing 125 obviously deserves top quality equipment. In addition to a high-tech chassis, the Aprilia RS 125 benefits from the most prestigious components available. The compact and lightweight, latest generation instruments are derived from those of the RSV 1000 R and include an analog rev counter and a multifunctional digital display incorporating an on-board computer that can be operated directly from the handlebars. To keep everything under control, the instrumentation includes a speedometer, rev counter, coolant temperature gauge and a racing chronometer. The system even has provision for interfacing with an optical alignment device for racetrack use.

A power kit, designed exclusively for racetrack use, is also available as an optional accessory to achieve the full potential of this amazing two-stroke engine. The kit includes:
- expansion chamber racing exhaust
- complete racing exhaust valve
- control unit and solenoid for racing exhaust valve
- needle, main jet and atomiser for full power carburation
- racing spark plug