The 2024 KTM 125 SX Dirt Bike is a formidable competitor in the 125 cc race; all it takes is one hard, rapid rip into a loamy berm. Not only has the “Ring-ting-ting” received a fuel-injected revitalisation, but it also brings class-leading advancements on all fronts. The 2024 KTM 125 SX outperforms the rest of the 125 cc class, earning awards including being the pioneer in 2-stroke motocross innovation in the contemporary age. Prodding the starter, blipping the throttle, and letting loose are all it takes.
2024 KTM 125 SX Dirt Bike – Features and Specs
Unmatched 2-Stroke Performance
Fuel injection, switchable engine maps, electronic start, best-in-class power-to-weight ratios, and simple maintenance are all part of the 2024 KTM SX series, designed for racers who want maximum power with minimal weight.

Easy Suspension Adjustment
Get focused! The suspension configuration at both ends of the 2024 KTM 125 SX Dirt Bike is completely tool-free. In only a few seconds, riders can switch between fast and low-speed settings thanks to the shock absorber design’s hand-adjustable dual compression control. A single air-pressure preload valve and easily accessible click adjustments for compression and rebound on the front end make it simple to adjust the forks. The air pump is included as standard.
Also Read: 2024 KTM 85 SX 19/16 Dirt Bike Review Specs Price
Electronic Fuel Injection
Electronic fuel injection sets the benchmark for pre-mix, which is remixed across the 2-stroke KTM SX lineup. Pre-race jetting is no longer necessary, and the Keihin EFI and reed valve case design ensure you deliver ideal power at any altitude.
Electric Start
Imagine yourself seven laps into an incredible race. You become stuck in a deep rut because you miss your line. But you don’t worry. To capture the last flag, all you have to do is hit the start button and launch again. This is the 2024 KTM 125 SX’s actual situation. The only thing you’ll be kicking is your ass because of a 12.8V 2 Ah lithium-ion battery that is positioned beneath the rider’s seat, a premium stator and pickup, and an incredibly sturdy build.
EFI + Power Valve
Excellent rideability comes with EFI. The 2024 KTM 125 SX Dirt Bike now incorporates a Power Valve in addition to electronic fuel injection, which increases useful power across the rev range. Better traction results from smoother power. Holeshot nirvana awaits with improved traction!
Performance
The 2024 KTM 125 SX Dirt Bike has long embodied the ultimate in power and lightweight design. For generations, motocross racers have favoured the 2-stroke motor for its ease of use and lower maintenance costs. Weighing just 17.86 kg, the KTM 125 SX sets the standard in the fiercely contested 250 cc class for 2024.

Selectable Maps
A map-select switch on the 2024 KTM 125 SX Dirt Bike lets the rider switch between two engine maps. While Map 2 gives it the full beans with sharp, explosive power production, Map 1 offers a linear, consistent power delivery like in 2023 KTM 125 SX.
Absolute Control
The frame design is not only provides longitudinal rigidity, but also redistributes rotating mass toward the centre of gravity, so no matter how gnarly the track is, you stay in full control. The shock mounting also improves anti-squat behaviour for better traction out of corners, and the new footpeg mounting position has been moved inwards to reduce the risk of hooking up in deep ruts or when scrubbing jumps.
Ergonomics
The 2024 KTM SX and SX-F series feature a rider triangle that increases knee contact with the bike, particularly while standing on the pegs, and enhances grip across the bike. The plastics push out mud buildup in wet, muddy conditions; the flatter seat profile and high-grip seat cover offer the rider maximum movement and control. The polyamide-reinforced aluminium subframe further improves rider feel and feedback.
Mass Centralization
With a major emphasis placed on mass centralisation, the 2024 KTM 125 SX Dirt Bike engine is designed to centralise rotating mass for better operation with the chassis. This creates a lighter, more responsive grip that outranks all the other.
Traction
Have a leg up ready to tear out your arms? In addition to the benefits of mass centralisation and a slight reduction in overall weight, it also significantly improves the anti-squat behavior of chassis by simply changing the overall concept of backbone of steel-frame. The 20livers the correct amount of power when accelerating from a corner just right.
Stability
The steering head connection has been repurposed and forged, combined with CNC-milled triple clamps; the 2024 KTM 125 SX Dirt Bike has become rock-solid at any time or speed. Constructed from high-quality aluminium, they are optimally stiffened in the steering stem, has perfectly aligned fork tubes and precisely tuned fork clamp geometry for high responsiveness and smooth fork action – even when charging in and onto the ruts and onto the podium.
Energy absorption
Besides the expertly crafted, hydro-formed, laser-cut, and robot-welded frame engineered to provide exceptional rider feedback and straight-line stability, it also features specifically calculated longitudinal and torsional flex. This means the frame has to “smooth” out the ride somewhat, so after multiple hard laps the rider isn’t as tired.
Ground clearance
No one enjoys a bad hook-up. Fortunately, the frame and shock absorber geometry of the 2024 KTM 125 SX Dirt Bike enhance the linkage’s ground clearance; the die-cast footpegs feature a topology-optimised design that reduces the risk of hooking in deep ruts and take-offs when scrubbing; and the footpegs have a slightly larger diameter.

Consistency
Low-friction SKF linkage seals and advanced damping characteristics deliver unsurpassed traction and energy absorption, lap after lap, with a WP XACT shock absorber.
2024 KTM 125 SX Dirt Bike – Technical Specifications
Engine
| Transmission | 5-speed |
| Starter | Electric starter |
| Stroke | 54.5mm |
| Bore | 54mm |
| Clutch | Wet multi-disc DS clutch, Brembo hydraulics |
| Displacement | 124.8cm³ |
| EMS | Vitesco Technologies EMS |
| Design | 1-cylinder, 2-stroke engine |
Chassis
| Weight (without fuel) | 92.4kg |
| Tank capacity (approx.) | 7.2l |
| Front brake disc diameter | 260mm |
| Rear brake disc diameter | 220mm |
| Front brake | Disc brake |
| Rear brake | Disc brake |
| Chain | 520, Non-sealed |
| Frame design | Central double-cradle-type 25CrMo4 steel |
| Front suspension | WP XACT-USD, Ø 48 mm |
| Ground clearance | 359mm |
| Rear suspension | WP XACT Monoshock with linkage |
| Steering head angle | 63.9° |
| Suspension travel (front) | 310mm |
| Suspension travel (rear) | 300mm |

