KTM 250 SX

Think "unbridled 2-stroke performance" and you'll probably see a KTM 250 SX in your mind's eye. For good reason too - there isn't much to compare it to. The 2025 KTM 250 SX takes that even further with a slew of fresh chassis enhancements, making it even more of a legend and one deserving of the record books.

At the core of the 2025 KTM 250 SX is a powerful 249 cm³, 1-cylinder, 2-stroke engine, weighing just 23.9 kg. This benchmark-setting engine delivers outstanding performance through its 5-speed transmission. A major technological leap for the 2-stroke SX range is the Electronic Fuel Injection (EFI). This Keihin EFI system, combined with a reed valve case design and electronic power valve, ensures smooth, more usable power throughout the rev range, eliminating fiddly jetting setups and guaranteeing optimal power at any altitude. An electric starter, powered by a robust 12.8V 2 Ah lithium-ion battery, means instant restarts. Riders can also choose between two engine maps via a map select switch: Map 1 (linear, predictable power) and Map 2 (crisp, explosive power).

The chassis receives significant updates for 2025, directly from Factory Racing efforts. The central double-cradle-type 25CrMo4 steel frame features a reworked rear shock mount area and updated engine mounts with cut-outs, resulting in improved chassis flex, better cornering behavior, and a 300g weight saving. The WP XACT AER 48mm upside-down forks and WP XACT monoshock with linkage have been re-tuned for 2025, offering improved response and easy, tool-free adjustability for both high and low-speed compression, as well as rebound. Lightweight and strong black anodized D.I.D rims are fitted with race-tested Dunlop MX34 tyres, featuring new carcass and rubber compounds for improved damping, absorption, and enhanced traction. Braking is handled by powerful Brembo disc brakes, with a 260mm front and 220mm rear disc for exceptional stopping power. Ergonomically, new tank shrouds with bi-compound plastics improve radiator airflow and cooling, while a new fuel tank roll makes for a tighter, more secure fitment. An upgraded rear brake pedal adds stiffness and improved feel, completing a machine crafted for ultimate race performance.