Motor parts

2012 Aprilia RS4 125 Review
2012 Aprilia RS4 125
The RS4 125 - the first Aprilia sport bike in this engine class with a 4-stroke engine allow young enthusiasts to take advantage of the maximum levels of technological innovation, chassis efficiency, active safety and component quality. On Aprilia 250 and 125 bikes in the RS series (RS, RSV, RSW and RSA) riders such as Biaggi, Rossi, Melandri, Stoner, Lorenzo rode to their first great triumphs.
From 1993 until today, more than 100,000 Aprilia RS 125 two stroke bikes have been manufactured and sold in more than 30 countries around the world.
Aprilia RS4 125 introduces the highly advanced, all-new four stroke powerplant to the sports segment, while adopting styling and technical solutions inherited from the RSV4, the superbike that led Aprilia to victory in the WSBK 2010 championship.
- Aprilia RS4 125 marked a milestone in the evolution of the 125 cc motorcycle.
This is the first Aprilia 125cc sport bike equipped with a four stroke engine.
- For the first time on a 125cc motorcycle, Aprilia offers the innovative Aprilia Quick Shift system, a sophisticated technical solution derived directly from its big sister, the RSV4 APRC.




2012 Aprilia RS4 125 Model Highlights
Below is a summary of the peculiar characteristics of the Aprilia RS4 125:

DESIGN
The livery and eye-catching forms of the Aprilia RS4 125 echo the looks of the Factory version of the Aprilia RSV4 supersports bike.
ENGINES
The sophisticated chassis architecture of the Aprilia RS4 125 is complemented by state of the art engines.
APRILIA QUICK SHIFT
For the first time on a 125 bike, Aprilia offers the innovative Aprilia Quick Shift system, a sophisticated technical solution derived directly from the extraordinary big sister, RSV4 APRC, which in turn is derived directly from Aprilias experience in the World Superbike championship.
The Aprilia RS4 125 boast class beating brake systems: each bike uses a 300 mm steel disc at the front, gripped by a four piston radial calliper, and a 220 mm disc at the rear with a single piston calliper.
The Aprilia RS4 125 are available in two colour schemes - "Racing Black" and "Racing White" - and in the bold "Replica SBK" livery which takes its colours from big sister, Aprilia RSV4 SBK, the bike ridden by Max Biaggi in the World Superbike championship

NEW INTAKE SNORKEL, NEW AIRBOX
NEW EXHAUST EXPANSION CHAMBER
The 125 EXCs new exhaust expansion chamber has not only improved in quality; in conjunction with the two-stroke machines exhaust control system, its optimised soundbox ensures an extra shot of engine power - explosive, but dependable.

NEW FRAME
The completely revamped frame made from high-quality chrome-molybdenum steel is characterised by even greater lateral stiffness. The 125 EXCs new, lighter, cast aluminium swingarm accommodates the shock absorber more centrally, in order to load the swing arms more evenly. TELESCOPIC FORK, NEW SETTING
The sensitive responsiveness and outstanding damping of the open-cartridge fork with 48 mm (1.89 in) outer tubes are a perfect complement for the 125 EXCs playful handling and precision.
NEW WHEELS
Practically unbeatable in terms of weight and stability, the new wheels have CNC-machined hubs, Excel rims, zinc/nickel-coated spokes and aluminium nipples. They reduce the unsprung and gyroscopic masses, hence bolstering the playful handling of the 125 EXC.

BODYWORK, KICKSTARTER
FREE-REVVING AND POWERFUL SPRINTER
NEW EXHAUST EXPANSION CHAMBER
NEW INTAKE SNORKEL, NEW AIRBOX


PLAYFUL HANDLING
NEW FRAME