£8,699.00
The 2026 KTM 125 SX embodies motocross’s pure adrenaline. It delivers neck-snapping sound, raw performance, and Factory-Racing heritage you can feel. Moreover, it pairs a featherweight engine with advanced electronics to conquer every race with confidence and control.
The bike gives you a switchable engine mapping system. The White Map delivers controlled, linear power on hard-packed terrain, while the Green Map unleashes a richer mix perfect for sandy or loose surfaces. Therefore, riders adapt instantly without sacrificing momentum.
Factory Performance Kit
For those chasing more bite, KTM offers a Factory Performance Kit. It includes upgraded engine components, an FMF exhaust, and refined mapping—delivering stronger performance across the rev range.
Fuel delivery is managed by precision EFI paired with an electronic power valve. As a result, power flow is smoother and more usable across the rev band. Better power means better traction—and that means more hole shots.
The chassis gains Factory Racing DNA through frame updates. The rear shock mount area is slimmed and refined for better flex. Additionally, engine mounts and cut-outs have been re-engineered to boost torsional control and overall stability.
Despite its punch, the 125 SX’s engine weighs a light 17.86 kg (39.7 lb). As a result, the bike swings with agility while maintaining high-rev power when you need to push hard. Its chassis updates further ensure precise handling under pressure.
KTM’s engineering philosophy favours fast access and simple maintenance. Therefore, service parts are easily accessed for quick adjustments at the track, eliminating pit-stall delays and keeping the focus on riding, not wrenches.
Bottom line? This little ripper is the one to beat. With a full range of KTM POWERPARTS and KTM POWERWEAR, you can kit out yourself and the bike with ease!
