Aprilia RS125

Aprilia RS125

Manufacturer	Aprilia
Parent company	Piaggio
Production	1992-2012
Predecessor	Aprilia AF1
Successor	Aprilia RS4 125
Class	Sport bike
Engine	124.8 cc (7.62 cu in) single cylinder two-stroke engine
Bore / stroke	54.0 mm × 54.5 mm (2.13 in × 2.15 in)
Power	28.2 bhp (21.0 kW) (claimed)[1][better source needed]
Torque	14 lb⋅ft (19 N⋅m)[2]
Transmission	6 speed
Suspension	Front : 40 mm (1.6 in) upside down hydraulic fork. Wheel travel 120 mm (4.7 in) Rear : Cast aluminium box section swingarm with asymmetric members. Hydraulic monoshock with adjustable spring preload. Wheel travel 120 mm.
Brakes	4 piston radial caliper
Tires	Tubeless radial. Front 110/70 17-inch; rear 150/60 17-inch
Wheelbase	1,345 mm (53.0 in)
Dimensions	L: 1,950 mm (77 in) W: 720 mm (28 in) at handlebars H: 1,100 mm (43 in) at windshield
Seat height	805 mm (31.7 in)
Weight	127 kg (280 lb)[2] (dry) 137 kg (302 lb) (wet)
Fuel capacity	14 L (3.1 imp gal; 3.7 US gal)
Fuel consumption	40 mpg‑US (5.9 L/100 km; 48 mpg‑imp)[2]

The Aprilia RS125 is a GP derived replica sport production motorcycle. It is powered by a Rotax single cylinder 124.8 cc two-stroke engine with Nikasil coated aluminium cylinder block, and liquid cooling.

Aprilia introduced the first RS125 in 1992.^[3] It has an angular tail section and swept front fairing, square cut headlight unit, three spoke rims, air scoops on the upper front middle fairing, Electric starter or kick start on the left hand side and analogue gauges. There was only one model variant in this year range which denoted RS 125 R on the tank and was red and black in colour. Production was 1994.^[4]

The RS125 is revised and the Extrema wording is dropped. The RS retains a lot of the appearances of the previous RS but there are some notable differences. The front air intakes are integrated into the front upper portion of the middle fairing. The headlight unit is rounded and the lip is introduced to the top centre. A digital gauge is added in place of the temperature gauge. For the Italian market the biggest change is a new engine, the Rotax 122,^[6] a new improved version to the previous Rotax 123. In most of Europe the Rotax 123 is still used up to 1997^[5]/1998 (Spain).^[7]

The RS125 was revised again in 1999 with more rounded and bulbous fairings, five spoke rims and a single air duct on the driver's right hand side. The lip on the headlight unit is increased in size.

The RS125 was given completely new fairing styling similar to the RSV 1000R. It has angular fairings, two headlight bulbs, a digital gauge, and multispoke Marchesini-styled^{[clarification needed]} rims. The bike also has a vacuum fuel tap on the tank.

Aprilia changed to radial four-piston brake calipers and added braided brake lines.

In 2008, Aprilia changed the electronics from Nippon-Denso to a EFI Technology ECU and introduced the new Dell'Orto 28 mm VHST CD carburetor to meet the more stringent EURO3 emissions standards.

The line was dropped in 2012 to make way for the new RS4 125, going from a two-stroke to a single-cylinder four-stroke fuel injected system.

The RS125 Tuono was introduced in 2003^[8] as a semi naked version of the RS125. Production ran until 2004^[8] and was subsequently dropped from the line-up.

The Tuono was essentially an RS125 with the middle and lower portions of the fairings absent and a handlebar fitted on the top yoke.

• RS 125 Official site.