Aprilia RS 125 (2003-04)

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The Aprilia RS 125, produced in 2003-04, is a single-cylinder, two-stroke motorcycle with reed valve induction and a 125 cc engine capacity. It has a compression ratio of 14.5:1 and is liquid-cooled. The Dell’Orto VHSB 34LD is the induction system, and it features electronic ignition and an electric starter. The maximum power of the bike is 21 kW, or 28 hp, at 10500 rpm, and the maximum torque is 19 Nm or 14.1 lb-ft at 9000 rpm. It is equipped with a 6-speed transmission, a chain-based final drive, an upside-down fork front suspension, and a monoshock rear suspension with a 120 mm wheel travel for both the front and the rear. The bike also has a single 320 mm disc front brake with a 4-piston caliper and a single 240 mm disc rear brake with a 2-piston caliper. The front and rear tires measure 110/70-17 and 150/60-17, respectively, with a wheelbase of 1345 mm.

Technical specifications:

Make Model: Aprilia RS 125

Year: 2003 – 04


Engine: Single cylinder, two stroke, reed valves induction
Capacity: 125 cc / 7.6 cu in
Bore x Stroke: 54 x 54.5mm
Compression Ratio: 14.5:1
Cooling System: Liquid cooled
Induction: Dell’Orto VHSB 34LD
Ignition: Electronic
Starting: Electric
Max Power: 21 kW / 28 hp @ 10500 rpm
Max Torque: 19 Nm / 1.9 kgf-m / 14.1 lb-ft @ 9000 rpm
Transmission: 6 Speed
Final Drive: Chain
Front Suspension: Upside-down forks, 40mm
Front Wheel Travel: 120 mm / 4.7 in
Rear Suspension: Monoshock

Rear Wheel Travel: 120 mm / 4.7 in
Front Brakes: Single 320 mm discs, 4 piston caliper
Rear Brakes: Single 240 mm disc, 2 piston caliper
Front Tyre: 110/70-17
Rear Tyre: 150/60-17
Wheelbase: 1345 mm / 53.0 in

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