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Aprilia RS125 Max Biaggi Black

It could reach a top speed of 155 km/h / 96 mph.

Aprilia RS125 Max Biaggi Black
Production 2009
Single cylinder, two stroke, reed valves induction, aluminum cylinder with Nikasil coated liner
Compression ratio 12.5:1
Top Speed 155 km/h / 96 mph
Ignition CDI electronic ignition
Transmission 6 Speed
Frame Cast aluminum, reinforced box section, sloping twin-spar frame
Suspension Front: Upside-down forks, Ø 40mm
Rear: Monoshock, cast aluminum box section swingarm with asymmetric members
Brakes Front: Single 320 mm floating discs, 4 piston radial caliper
Rear: Single 220 mm disc, 2 piston caliper
Front Tire 110/70-17
Rear Tire 150/60-17
Wheelbase 1345 mm / 53.0 in
Seat Height 805 mm / 31.7 in
Weight 127 kg / 280 lbs (dry), 142 kg / 313 lbs (wet)
Fuel Capacity 14 Liters / 3.7 US gal
Manuals Service Manual



The engine was a Liquid cooled cooled Single cylinder, two stroke, reed valves induction, aluminum cylinder with Nikasil coated liner. The engine featured a 12.5:1 compression ratio.


Power was moderated via the Wet, multi-disc.


It came with a 110/70-17 front tire and a 150/60-17 rear tire. Stopping was achieved via Single 320 mm floating discs, 4 piston radial caliper in the front and a Single 220 mm disc, 2 piston caliper in the rear. The front suspension was a Upside-down forks, Ø 40mm while the rear was equipped with a Monoshock, cast aluminum box section swingarm with asymmetric members. The RS125 Max Biaggi Black was fitted with a 14 Liters / 3.7 US gal fuel tank. The bike weighed just 127 kg / 280 lbs. The wheelbase was 1345 mm / 53.0 in long.




Aprilia RS 125 Max Biaggi Black

Aprilia RS 125 owes much more than its graphics to the race world - it is a genuine race replica for budding young riders, encapsulating all the technical expertise of the Noale based marque in the one-eighth litre class. Over the years, RS 125 has earned a reputation as a benchmark for 2-stroke sports motorcycles which continues to receive public and critical acclaim in the most important European markets and is still today the bike of choice for riders competing in Sport Production races. Confirming this remarkable success, in 2009, the Aprilia RS 125 was voted Bike of the Year in its category by the magazine "Motociclismo" and nominated Best 125 of 2009 by the specialised magazine "In Moto" following a referendum held among the readers of 12 specialised publications representing 12 European nations. Aprilia RS 125 boasts class beating componentry and mechanicals, such as the powerful and reliable single cylinder two stroke engine which, over the years, has earned a reputation of being unbeatable in terms of both performance in the race track and reliability on the road.

The compact, ultra light RS 125 is a concentrated package of sophisticated technology: the frame and swingarm are both derived from Moto GP experience and made from ultra-stiff aluminum. An upside down front fork, the front brake with radial caliper with four, horizontally opposed pistons and the wheels with split spokes are testimony to the bike's overtly racing character. Other unique features for the RS 125 include an analogue/digital instrument panel complete with multifunctional computer, a forged steering yoke and an oval racing silencer with riveted end caps.

Features of the Aprilia RS 125:

Tried and tested yet extremely sophisticated Rotax two stroke engine; super-rigid aluminum frame and swingarm derived from Aprilia’s vast GP experience; upside down fork; front brake with radial caliper and four opposed pistons; RSV 1000 R style fairing, windshield and tail; RSV Factory style, crossed spoke wheels; analog/digital instrument panel with multi-functional computer; RSV Factory style, forged steering yoke; oval section racing silencer with riveted end plates;

The mean, cutting edge look of the new RS 125 tells you that this is a professional racing machine. The styling of the RS, like that of all Aprilia sports bikes, is the result of painstaking aerodynamic research.

The fairing, for example, was perfected by extensive wind tunnel testing, to guarantee great wind protection and minimum drag for maximum racetrack efficiency. The fairing, windshield and tail not only look mean and aggressive, but allow the RS 125 to reach a blistering top speed, eliminating all turbulence around the rider and allowing man and machine to become one.

The latest generation twin halogen headlight also adds to the mean look of the new RS 125, and delivers a high power light beam for enhanced visibility and safety at night. The sleek tail looks exactly like the tail of a GP racer. Thanks to the effort put into the design of the RS 125’s tail, not even the passenger seat disturbs the bike’s impeccable lines.

The crossed spoke wheels are not only lighter and more stylish, but safer and more reliable too.

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 has won Aprilia’s single cylinder two stroke homologation to Euro 3 standards. And the amazing thing is that this has been achieved without losing out on performance: the Aprilia RS 125 engine remains the reference point for all 125 cc powerplants.

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 aluminum 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, aluminum alloy swingarm has the highest torsional rigidity of all production 125 cc swingarms. Differential side members enable the exhaust to follow a path that maximises engine performance and enables 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 RS 125 can rely on an upside-down fork that has been optimized 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 125 GP 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 the best available, and designed for maximum efficiency under competitive riding conditions. The front brake is a genuine state-of-the-art, high performance system with a radial caliper and four opposed pistons. 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, high performance braking.

The Aprilia RS 125 is packed with prestige components. Compact and impressively light in weight, the instruments include an analog rev counter and a multifunctional digital display with an on-board computer that can be operated from the handlebars. The speedometer, rev counter, coolant temperature gauge and exclusive racing chronometer put you in total control. The on-board computer even has provision for interfacing with the optical finishing systems used on racetracks.

"As you accelerate the Single seems to gain momentum in protest. But as the rpms progressively increase, the engine begins to spool up quicker. That glorious 2-stroke “braappp” matches engine speed and as soon as the crankshaft spins to that magic 10,000 rpm, the engine springs to life and finally rewards its riders with some decent acceleration." – motorcycle-usa

"If you are of normal size and keep the little engine singing in its sweet spot, she has plenty of juice to see triple-digit speeds and embarrass riders on liter-bikes in the tight stuff. Top speed attained at MSR Houston was an indicated 108mph on the longest straight and still pulling;" – 2wheeltimes

"The Aprilia RS125 is probably one of the best handling bikes on the planet. Its able chassis can easily cope with double the power. The Aprilia RS125’s brakes are astonishing, particularly so on the 2006-onwards motorcycles, which boast a sexy radial caliper up front, and the forks are beefy 40 mm items for greater control." – MCN

The Aprilia RS 125 can mark the beginning of a beautiful friendship between young riders and supersport bikes in general as the small two-stroke blast has all it takes to make one fall in love with quick acceleration and sharp handling, all in a user-friendly manner and for a customer-friendly MSRP of $5,499.

Make Model Aprilia RS 125 R Max Biaggi Black
Year 2009
Engine Type Single cylinder, two stroke, reed valves induction, aluminum cylinder with Nikasil coated liner
Displacement 124.8 cc / 7.5 cu in
Bore X Stroke 54 x 54.5mm
Compression 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 17:40
Gear Ratios 1st 10:30 / 2nd 14:29 / 3rd 17:27 / 4th 19:25 / 5th 21:24 / 6th 22:23
Primary Drive 63:19
Frame Cast aluminum, 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 aluminum 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 Aluminum alloy
Front Rim 3.00 x 17
Rear Rim 4.00 x 17
Front Tire 110/70-17
Rear Tire 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 127 kg / 280 lbs
Wet Weight 142 kg / 313 lbs
Fuel Capacity 14 Liters / 3.7 US gal
Top Speed 155 km/h / 96 mph