The new Aprilia Aprilia RS4 is the first step away from the lines-2, which made them famous. The 2-stroke RS125 is still sold (in Europe), but the emergence of this new 125 4-stroke Aprilia shows the direction for the future.
Everyone knows that 2-stroke engines can produce more energy than a similar size 4 stroke. The RS125 can be set to about 33 horsepower, while the RS4 can reach only about 25 125 hp with a 180cc kit. The RS4 125 can not replace the RS125 in performance, but benefits from a couple reliable 125 cc four-stroke engine, which does not require a rebuild every 10,000 miles. The RS4 125 is also more environmentally friendly by using less fuel and oil compared to 2-stroke engines.
Aprilia RS4 125 2011
I tried the RS4 125 students in a legal version that generates 15 horsepower at 10,500 rpm. The maximum torque of 8.1 Nm at 8500 rpm is produced. The top speed of 75 mph allows for safe driving on motorways, and the engine will not fly after the long road races. The torque curve allows four-stroke engine cruise of 8,500 rpm and a very decent range.
Aprilia RS4 125 2011
The 300 mm discs up front provides a strong response.
I, however, tested on a racetrack, so I spent most of the time trial in the range of between 10,000 and 11,000 rpm on the engine pulls better than any other place in the power range. It is a narrow range of driving fast, and soon learned to slow down should be avoided at all costs. Compared to a 2-stroke, however, there are plenty of midrange. I had fun trail of the other journalists in the circuit as they do in the 125 GP championship, but became a bit boring, as soon as I found no one to follow.
At 125 RS4 brakes are very sharp, consisting of a 300 mm disc and 4 piston radial caliper. I hardly used the rear brake 200 mm in all that, let's face it, the speed to stay out was not great.
Dry weight of the RSV is an alleged 295 pounds, which is a light weight for a 4 times, but about 30 pounds heavier than an RS125.
I'm pretty big for the RS4 125, but briefly in the photos may think I'm in the place of the RSV4 RS4. The suspension is not adjustable, and to my surprise, Aprilia has found a good level configuration, having nothing to complain about the chassis. I think the best bike rider achieved with a small lighter, again involving more than 16 years of age. The tires are 100/80-17 front and 130/70-17 one step back.
Aprilia RS4 125 2011
Suspension, although it is adjustable, has a surprisingly good level adjustment.
I was impressed with the amount of ground clearance when leaned over, and I noticed a considerable loss of speed as soon as I went from total fat to the vertical position due to increased effective leverage of the rim. I was not aware of this principle, as is sometimes move in total fat, which is natural in a large capacity motorcycle. But in 125, it is best to use only the motor back to the best area? Transition as the bike is upright on corner exit. There is sufficient energy to break the rear tire, and nothing to gain maximum power is reached, while the bike is stood up.
Aprilia RS4 125 2011
A quick shifter RS4 gives a touch of superbike performance.
Aprilia offers a quick shifter as an accessory, and no doubt is of great benefit for the small 125, as the acceleration suffers without the release lever of rapid change. The RS4 125 is more or less a bonus of 125 in the first place, but with the gear faster than a superbike is like for young people.
Pricing in the UK is not as rigid compared to the competition are mostly Honda CBR 125R (£ 3,270 OTR) and Yamaha YZF R125 (reg + £ 4,249 + taxes). The Aprilia RS4 125 RRP OTR is £ 3.999 + £ 99 for quick gear changes. The little cold tiddler will reach U.S. dealers in early 2012 at a price to be determined.
I just tried the RS4 125 in the circuit, but it is clear that the small 125 functions as a very good road bike too. Low cost 2-stroke oil, fuel, fair and very little of it. The fairing is almost identical to the big superbike RSV4 and two large headlights that 125 is just like any other motorcycle in the car mirror. Style exhaust hidden under the fairing, and sounds a bit more grown up than 2 times.
The seat is sporty and comfort levels are the same as in any sport bike, and this goes for ergonomics in general. The rear seat cover can be replaced by a passenger seat, and no room for a few bits and bobs. The mirrors are large and provide good views of traffic behind.
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