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ID # 21083777

2023 KTM 125 SX

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All it takes is one hard, fast rip into a loamy berm to know that the 2023 KTM 125 SX is a serious contender in the 125 cc race. Not only has the 'Ring-ting-ting' been given a fuel-injected revival, but the entire motorcycle also benefits from class-leading developments at every end. Boasting accolades such as being the leader in 2-stroke motocross innovation in the modern era, the 2023 KTM 125 SX simply slays the rest of the 125 cc class. All you need do is press the starter, blip the throttle and let rip.
125 SX
Sale Type
Engine Size
124.8 cm³
Vitesco Technologies EMS
54 mm
X-Ring 5/8 x 1/4"
Wet multi-disc DS clutch, Brembo hydraulics
1-cylinder, 2-stroke engine
54.5 mm
Electric starter
Disc brake
Disc brake
958 mm
124.8 cm³
Central double-cradle-type 25CrMo4 steel
WP XACT Monoshock with linkage
WP XACT-USD, Ø 48 mm
359 mm
63.9 °
92.4 kg
7.2 l
220 mm
300 mm
260 mm
310 mm
before the gate

2023 KTM 125 SX Easy Suspension Adjustment

Get dialed in! The 2023 KTM SX range boasts totally tool-free suspension setup at both ends. Thanks to an all-new shock absorber design featuring hand-adjustable dual compression control, it allows riders to adjust high- and low-speed settings in a matter of seconds. On the front end, the forks are also easily adjusted thanks to a single air pressure preload valve, as well as through easy access click adjusters for compression and rebound. We'll even throw the air pump in as standard.

2023 KTM 125 SX Electronic Fuel Injection 

Pre-mix gets a remix across the 2-stroke KTM SX range, with Electronic Fuel Injection setting the standard. Now there's no more jetting setup pre-race. And thanks to the all-new Keihin EFI and reed valve case design, you can be guaranteed of laying down optimal power at any altitude, all of the time.

2023 KTM 125 SX Electric Start

Picture this; You're 7 laps into an absolute ripper of a race. You miss your line and end up stalling in a deep rut. But you don't sweat it. All you do is press the starter button and you blast off again to take the final flag. This is the reality on the 2023 KTM 125 SX. Thanks to a 12.8V 2 Ah lithium ion battery placed under the rider’s seat, a new high-quality stator and pickup and super robust design, the days of kick-starting are over.

start strong

2023 KTM 125 SX EFI + Power Valve

With EFI comes great rideability. Along with the electronic fuel injection, a new power valve has also been fitted to the KTM 125 SX, allowing for more usable power throughout the rev range. Smoother power means better traction. Better traction means holeshot heaven!

2023 KTM 125 SX Performance 

Designed to churn out more torque than any 125 cc 2-stroke engine to ever come before it, the 2023 KTM 125 SX is set to continue its dominance in its class with unrelenting forward momentum. With an overall engine weight of only 39.3 lb and impressive horsepower figures, this lightweight powerplant retains its typical high-revving character, while laying down the grunt where it matters most.

2023 KTM 125 SX Selectable Maps

Once again slicing into the 125 cc class with the leading edge of technology, the 2023 KTM 125 SX features a map select switch allowing the racer to switch between 2 engine maps.


calm under fire

2023 KTM 125 SX Absolute Control

No matter how gnarly the track is, you'll stay in complete control thanks to an all-new frame design that has not only been engineered for longitudinal rigidity but also repositions rotating mass closer to the center of gravity. A new shock mounting also provides improved anti-squat behavior to better traction out of corners, while the footpeg mounting position has moved inwards for less risk of hooking up in deep ruts or when scrubbing jumps.

2023 KTM 125 SX Ergonomics 

The 2023 KTM SX and SX-F range feature an entirely new and improved rider triangle, providing improved knee contact - especially when standing on the pegs - with improved gripping surfaces all around. New plastics work to expel mud buildup in wet, muddy conditions, with a new, flatter seat profile and high grip seat cover providing exceptional rider movement and control. The polyamide reinforced aluminum subframe further enhances rider feel and feedback.

2023 KTM 125 SX Mass Centralization

With a major emphasis placed on mass centralization, the 2023 KTM 125 SX engine is designed to centralize rotating mass for optimal operation with the chassis. This results in a lighter, more agile handling feel, which together with more torque and smoother power delivery, make it the most competitive 125 cc motocrosser yet.


hit the big stuff

2023 KTM 125 SX Traction 

Ready to rip your arms out of the sockets? Together with the benefits of mass centralization and an overall lighter feel, the anti-squat behavior of the chassis is significantly improved by changing the backbone of the steel frame concept. In layman's terms, the 2023 KTM 125 SX gets its power down perfectly when tearing out of corners.

2023 KTM 125 SX WP XACT Fork 

48 mm air type WP XACT front fork with a split damping function provides all the confidence you need to attack the track. New hydrostops in the fork legs improve bottoming-out resistance and account for less rebound when attacking big jumps, bumps, and thumps. Redesigned fork protection rings also increase protection against dirt, making them as reliable as they are awesome.

Stability 2023 KTM 125 SX

The 2023 KTM 125 SX is rock-solid at any speed thanks to a repositioned and forged steering head connection and CNC milled triple clamps. Made from high-grade aluminum, these feature optimally tuned steering stem stiffness, perfect alignment of the fork tubes, and precise geometry of the fork clamps to ensure highly responsive and smooth fork action - not to mention unwavering stability when charging across ruts and onto the podium.


maintaining momentum

2023 KTM 125 SX Energy absorption 

Besides the expertly crafted, hydro-formed, laser-cut, and robot-welded frame being engineered to provide exceptional rider feedback and straight-line stability, it consists of specifically calculated parameters of longitudinal and torsional flex. This means the frame acts as a "shock absorber" of sorts, making for a less harsh ride, resulting in less rider fatigue over many hard laps.

2023 KTM 125 SX Ground clearance 

The all-new frame and shock absorber geometry on the 2023 KTM 125 SX improve ground clearance of the linkage, with all-new topology optimized die-cast footpegs that are less susceptible to hooking on deep ruts, and take-offs when scrubbing.

2023 KTM 125 SX Consistency

A new WP XACT shock absorber provides unmatched consistency lap after lap, thanks to low-friction SKF linkage seals and advanced damping characteristics for unsurpassed traction and energy absorption.


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