Table of contents

• Driving report: Aprilia RS4 125 Aprilia’s new four-stroke 125cc
• Technical specifications

Aprilia

motorcycles

Driving report of the Aprilia RS4 125 – four-stroke engine

Driving report: Aprilia RS4 125
Aprilia’s new four-stroke 125cc

After 36 world championship titles, 282 world championship victories and over 100,000 copies of the RS 125 sold, the two-stroke fragrance is now over. The new RS4 is no less sporty, but in four-stroke.

Stefan luck

06/09/2011

Without the two-stroke racer Aprilia RS 125, the careers of full throttle heroes like Marco Melandri, Jorge Lorenzo, Casey Stoner, of the multi-world champion Valentino Rossi or the reigning Superbike champion Max Biaggi – incidentally on the Aprilia RSV4 – would have been hardly conceivable. You and many more have laid the foundation for their careers on it. So it is only logical that the presentation of the completely newly developed RS4 125 also takes place on a racetrack, in this case a small but modern circuit near Milan.

And just like in real life, you put on the right shoes to exercise. In this case it is Pirelli Diabolo Supercorsa in SC1 mixture. In the series it will probably be Schwalbe rubbers.

But enough of the banter, the pre-start calls. At first glance, the RS4 can hardly be distinguished from the RSV4, especially at an angle from the front. The triumvirate of lamps, the tank / bench line, the short, crisp rear – everything looks identical, but is a tad more compact.

Compact, but not folded up like a ruler, you sit down, the handlebars are not too deep, the notches are not too high. The DOHC-controlled single cylinder thuds deep in the belly of the fairing. He delivers 15 hp at 10,500 tours, more he is not allowed to. The (driver’s license) regulations want it that way.

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Green! The pack rushes off. Anyone who engages below 7000 is immediately passed through to the rear. Damn! After! Attack! The single rushes through the speed range with slight vibrations and linear power output, at 11,000 the limiter sets the last moment to shift. Some of the presentation bikes are equipped with the automatic gearshift, which is available as an extra (approx. 100 euros). The six corridors can be stepped through without domes, without gas lifts and, above all, without wasting time. Cool! The switching scheme is conventional, but can be reversed in a flash.

Since the forward thrust is manageable with 15 HP, you have to drive around so as not to lose any momentum. The RS 4 follows the targeted line precisely and neutrally, which can also be easily corrected if necessary. Lean angle is not an issue. Braking points are rare, but they do exist. Can be operated with two fingers, with a clean pressure point and powerful deceleration, the 300 mm disc and its steel-flex-reinforced radial saddle catch the racer again, the rear disc is free.

The turns are over much too quickly, time for a summary: At 4195 euros, the RS4 is a very real offer. And if it is only beginning to be as successful in racing as its predecessor, there will be a few more victories and titles.

Technical specifications

Aprilia

The chassis and suspension elements would also easily cope with twice the power.

engine
Water-cooled single-cylinder four-stroke engine, two overhead, gear-driven camshafts, four valves per cylinder, bucket tappets, wet sump lubrication, injection, Ø 32 mm, regulated catalytic converter, 330 W alternator, 12 V / 6 Ah battery, mechanically operated multi-plate oil bath clutch, six-speed gearbox, chain, Secondary gear ratio 60:13.
Bore x stroke 58.0 x 47.0 mm
Cubic capacity 124 cm³
rated capacity 11.0 kW (15 PS) at 10,500 rpm
Max. Torque 11 Nm at 8250 rpm

landing gear
Bridge frame made of aluminum, upside-down fork, Ø 41 mm, two-arm swing arm made of aluminum, suspension strut, directly hinged, adjustable spring base, front disc brake, Ø 320 mm, four-piston fixed caliper, rear disc brake, Ø 220 mm, two-piston fixed caliper.
Cast aluminum wheels 2.75 x 17; 3.50 x 17
Tires 110/80 ZR 17; 130/70 ZR 17

Dimensions + weights
Wheelbase 1350 mm, steering head angle 65.0 degrees, caster 94 mm, spring travel f / h 110/130 mm, dry weight 135 kg, tank capacity / reserve 14.5 / 3.3 liters.
Warranty two years
Colors black, white, SBK replica
Price 4021 euros
Additional costs 174 euros

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