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Aprilia has always been ahead of the pack when it comes to modern technologies and motorcycle upgrades. With every year that passes its models become better and better and the 2104 SX 125 makes no exception.

The motorcycle is aimed at young riders that want to learn the ups and downs of off-road riding so it’s light, agile and easy to handle.

The 2014 SX 125 rides on 17” wheels shod in sports tyres (110/70-17” and 150/60-17”) and is powered by a compact, Rotax 122 single cylinder 2-stroke, 124,8 cc engine. The unit develops a maximum power of 11 KW and 12.2 Nm of torque at 8000 Rpm which is more than enough to propel you to speeds of up to 115 kmph. Its power is kept under control by a six speed gearbox with multi-plate wet clutch.

Hit the jump for more information on the 2014 Aprilia SX 125.

  • 2013 Aprilia SX 125
  • Year:
  • Make:
  • Model:
  • Engine:
    Rotax 122 single cylinder 2-stroke. Aluminium cylinder with Nikasil liner
  • Transmission:
  • Horsepower @ RPM:
  • Torque @ RPM:
  • Energy:
  • Displacement:
    124 cc


2013 Aprilia SX 125 High Resolution Exterior
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It was inevitable that the innovative SXV and RXV would extend their influence to other members of the Aprilia range sooner or later. The world-beating styling, performance and technology of these fantastic machines has engendered a family of eye-catching and modern off-road motorcycles. The SX 125 and RX 125 are the latest off-road machines from Aprilia. Specialist and refined, they are the obvious choice for young riders who want to stand out right from the very start. The SX and RX are both built to deliver total rider satisfaction. Though the technology is basically the same, it has been adapted to match the different specialities. The SX and RX share the same body, frame, engine and suspensions but have very different characters for very different passions.

With its 17” wheels and sports tyres, the SX is the obvious candidate for the prize of the meanest 125 over mixed routes. Nippy and lightweight, the SX delivers real ‘big bike’ performance without exceeding the power restrictions imposed by law. Its refined, sprightly engine never lets you down.
The RX and the SX 125 also share a clear Aprilia family look, obviously inspired by their bigger sisters, machines that have established a whole new trend in off-road design.

2013 Aprilia SX 125 Key Features:

2013 Aprilia SX 125 High Resolution Exterior
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Aprilia was the first manufacturer to introduce dramatic innovations to the designs of essential enduro and motard motorcycles. In the same way in which the RXV and SXV have become style icons in their own right, the SX and RX are destined to leave their mark on young off-road riders. As with all off road motorcycles worthy of respect, the SX and RX are built for maximum functionality and efficient riding and control. Their styling leaves no room for pointless frills and gadgets. The unmistakably pure lines of the SX and RX are simply unique among off-roaders.


The single cylinder unit that powers these Aprilia 125 cc motorcycles is a state-of-the-art two stroke engine. It is a classic example of how race-developed technology can deliver extremely low emissions as well as top performance. On the RX 125 and SX 125, Aprilia has succeeded in perfecting its two stroke design to bring it in line with the strict new Euro 3 standard without any loss of performance or riding satisfaction. This sparkling single cylinder engine easily develops the maximum permitted power for its class, with all the lightness and zippy acceleration typical of a high performance two stroke. This engine has already established a place for itself in the hearts of 125 fans, thanks to its many advanced characteristics, including liquid cooling, and a balancer shaft. The cylinder has a nickel silicon carbide (Nikasil) liner for an ultra-reliable, extended life. Lubrication is provided by a separate mixer system.

Brakes and Suspension:

Active safety on the Aprilia RX and SX is ensured by advanced suspension and a braking system that sets new standards for stopping power and progressive action. The front brakes feature a 260 mm disc and two-piston floating caliper while the back brake incorporates a 220 mm disc and another floating piston. The robust, steel, double cradle frame is coupled to an over-sized suspension system. At the front is a mighty, 40 mm upside down telescopic fork offering wheel travel of 260 mm. At the back, a long steel swingarm delivers maximum traction and a rear wheel travel of 270 mm.


Specialist motorcycles like the RX and SX demand top level components, especially wheels, the strength and lightness of which are so important to handling. The Aprilia RX and SX are equipped with prestigious spoked wheels with new black anodised rims. Just like top sports motards, the SX boasts lightweight 17 inch, wide profile wheels and generous sports tyres, 110/70-17” and 150/60-17” for maximum grip under all conditions.


To confirm its determination to build advanced motorcycles that are versatile and practical in everyday use, Aprilia has equipped the RX and SX with sophisticated digital instruments just like those on the bigger SXV and RXV. Once again Aprilia motorcycles are going to feature in the dreams of young riders.


Engine type: Rotax 122 single cylinder 2-stroke. Aluminium cylinder with Nikasil liner.
Fuel: Unleaded petrol.
Bore x Stroke: 54mm 54,5mm
Total displacement: 124,8cc
Compression ratio: 12,5:1
Maximum power at the crank: 11 kW and 16 kW
Maximum torque at the crank: 12.2 Nm @ 8000 rpm (11 kW) and 16 Nm @ 9750 rpm (16 kW).
Fuel system: Dell’Orto VHST 28 carburettor.
Ignition: Electronic CDI ignition.
Starting: Kick start.
Generator: 12V-180W
Lubrification: Separate mixing with variable displacement, volumetric pump.
Gear box: 6 speed. Ratios 1st 10/30 2nd 14/29 3rd 17/27 4th 19/25 5th 21/23 6th 22/21
Clutch: Multi-plate wet clutch.
Primary drive: Helical gears. Ratio: 19/63.
Final drive: Chain. Z 16 gearbox pinion, Z 45 rear wheel sprocket (11 kW); Z 15 gearbox pinion, Z 45 rear wheel sprocket (16 kW).
Frame: High strength steel frame with double trellis beam and double cradle. Detachable seat frame.
Front suspension: 40 mm upside down hydraulic fork. Wheel travel 260 mm.
Rear suspension: Steel swingarm. Hydraulic monoshock with piggy back cylinder.
Wheel travel 270 mm.
Brakes: Front brake 260 mm disc. Floating caliper with two parallel pistons. Rear brake 220 mm disc. Floating caliper with single piston.
Wheels: Front wheel Aluminium, 3.00x17”. Rear wheel Aluminium, 4.25x17”.
Tyres: Front tyre Pirelli Diablo, 110/70x17”. Rear tyre Pirelli Diablo, 150/60x17”.
Dimensions: Overall length 2,165 mm. Overall width (at brake levers) 850 mm. Overall height (at mirrors) 1,390 mm. Seat height 870 mm. Wheelbase 1,480 mm.
Dry weight: 115Kg
Fuel tank capacity: 10 litres (including 1.3 litres reserve).
Cooling: Liquid cooled.
Intake: Reed valve.
Maximum speed: 115 kph (11 kW); 120 kph (16 kW).
Emissions: Euro 3 (11 kW and 16 kW).
Other: Other characteristics Essential multifunctional instrument panel. Colour schemes Off Black


If it wasn’t fitted with its compact 2 stroke engine the SX 125 could’ve been very easily considered a bigger supermoto given its proportions.

Its engine delivers decent performances and while its low end power won’t impress you with its punch the top end will certainly do.

You’ll also like the bike’s steering, but the suspension feels a bit uncomfortable due to the big travel and soft springs.

Like any Aprilia, the built quality is superb and the Brembo brakes are also up to the task.

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