The livery and eye-catching form of the Aprilia RS4 125 echo the looks of the Factory version of the Aprilia RSV4 supersports bike. And the RS4 shares more than just a family resemblance with the most hardcore street version the bike dominating the world SBK championship. The design of the fairings and tank, the unique looks of the front end, with the headlights suspended over the gaping air intakes, and the spectacular tapered tail fairing are identical to their counterparts on V4 1000 cc supersports model that set new standards in terms of style and technical content for the superbike segment. Engine Bore: 58 mm Stroke: 47 mm Engine Type: Four stroke liquid cooled single cylinder with electronic injection and 4 valves. Euro 3 homologated Ignition: Electronic with CDI capacity discharge ...