The 2027 KTM 250 SX in ORANGE is a focused 249 cm³, single-cylinder 2-stroke motocross machine built around KTM’s latest SX chassis updates and modern EFI rideability. Keihin EFI with a 39 mm throttle body works with a power valve and Vitesco Technologies EMS to deliver smoother, more usable power through the rev range, backed by a 5-speed transmission and a wet DDS multi-disc clutch with Brembo hydraulics. WP XACT suspension at both ends, disc brakes, and a Central double-cradle-type 25CrMo4 steel frame round out a package aimed at riders who want precise feel, easy adjustability, and race-ready control.
A 249 cm³ 1-cylinder 2-stroke engine pairs Keihin Electronic Fuel Injection (39 mm throttle body) with a power valve for more usable power across the rev range. KTM emphasizes smoother power for better traction, and the Vitesco Technologies EMS supports consistent running across conditions. A 5-speed transmission and a wet DDS multi-disc clutch with Brembo hydraulics complete the drivetrain for responsive, controlled starts and exits.
WP XACT-USD (AER) 48 mm forks and a WP XACT Monoshock with linkage are matched to the SX chassis for a controlled feel through braking bumps, ruts, and landings. Both ends offer tuneability, with the fork featuring compression (high and low speed) plus rebound adjustment, and the rear shock providing compression and rebound adjustment. With 310 mm front travel and 300 mm rear travel, the suspension package is built to handle hard laps.
KTM’s revised frame updates focus on targeted chassis flex and rider feedback, with changes around the rear shock mount area and optimized engine mounts and cut-outs. The Central double-cradle-type 25CrMo4 steel frame works with an aluminum-reinforced polyamide subframe, and KTM also calls out improved wiring-harness routing and fixing points aimed at reducing wear. Ground clearance is listed at 354 mm for track conditions that get deep and rough.
The 2027 250 SX uses a 249 cm³ single-cylinder, 2-stroke design with Keihin EFI (39 mm throttle body) and Vitesco Technologies EMS. KTM pairs EFI with a power valve to broaden usability through the rev range, with the goal of smoother delivery and improved traction when the track gets slick or choppy.
For riders who like to tailor character to conditions, KTM includes a map select switch with two engine maps. Map 1 is described as linear and predictable, while Map 2 is tuned for crisp, explosive output. Power is managed through a 5-speed transmission, and the wet DDS multi-disc clutch uses Brembo hydraulics for consistent lever feel under race intensity.
WP XACT components anchor the suspension package: a 48 mm WP XACT-USD (AER) fork up front and a WP XACT rear shock with linkage. KTM highlights tool-free setup at both ends, including hand-adjustable clickers for fork compression and rebound, and a hand-adjustable dual compression option at the rear to quickly change high- and low-speed settings.
The fork’s AER design is described with a capsulated air spring and pressurized oil chamber to promote progressive, consistent damping, while oil and air bypasses help reduce pressure peaks. KTM also notes a single air pressure pre-load valve, and the WP air pump needed for adjustment is provided as standard in the buy-pack. Suspension travel is listed at 310 mm front and 300 mm rear.
KTM’s hydro-formed, laser-cut, robot-welded frame is engineered around calculated longitudinal and torsional flex, intended to provide rider feedback and straight-line stability while helping reduce harshness over many laps. The frame design is a Central double-cradle-type 25CrMo4 steel structure, paired with an aluminum-reinforced polyamide rear subframe.
For rider movement, KTM points to an updated rider triangle and tank shrouds using bi-compound plastics, along with a concise fuel tank roll designed for a tighter fitment and improved durability. The fuel tank capacity is listed as 7.2 l (approx.). KTM also calls out a durable chain guide and chain guard to help reduce hooking on external objects and reduce dirt build-up, and notes modified fixing points and wiring harness routing intended to be less prone to wear and damage.
Braking is handled by disc brakes front and rear, and KTM adds a special rear brake pedal for increased stiffness, bending resistance, and braking feel. Up front, KTM notes a forged steering head connection and CNC-milled triple clamps intended to keep fork alignment precise for responsive action and stability in ruts.
The motocross range is equipped with Dunlop GEOMAX MX34 tires, described by KTM as developed for stability and control with a rigid carcass and compound aimed at improved damping and absorption. Dimensions include a 958 mm seat height, 354 mm ground clearance, and a listed weight (without fuel) of 99.4 kg.
As always, the suspension boasts an easy tool-free setup at both ends, ensuring you chase down the podium in total control. On the rear, a hand-adjustable dual compression option allows riders to adjust high- and low-speed settings in a matter of seconds. The forks on the front end are also easily modified thanks to hand-adjustable clickers on the bottom of the fork shoe and top cap.
Pre-mix gets a remix across the 2-stroke KTM SX range, with Electronic Fuel Injection setting the standard. Now there's no setup pre-race. And thanks to the Keihin EFI and reed valve case design, you can be guaranteed of laying down optimal power at any altitude, all of the time.
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 don't sweat it. All you do is press the starter button and you blast off again to take the flag. This is the reality on the KTM SX models. Thanks to a 12.8V 2 Ah lithium ion battery placed under the rider's seat, a high-quality starter and pickup, and super robust design, the only thing you'll be kicking - is ass.
The KTM SX and SX-F range is engineered and designed to provide riders with easy-to-access service parts, as well as suspension adjustability. This allows for faster trackside and off-season maintenance, while also simplifying motocross for novice riders without pit crews. A revised threaded radiator cap enables easier and quicker opening with reduced effort.
With EFI comes great rideability. Along with the electronic fuel injection and a power valve on the KTM SX models, allowing for more usable power throughout the rev range. Smoother power means better traction. Better traction means holeshot heaven!
The KTM 250 SX has always represented the very best of unsurpassed power and lightweight construction. The simplicity and low maintenance cost of the 2-stroke motor have made it a favorite amongst motocross riders for generations. The KTM 250 SX enters the race paddock with an overall engine weight of only 52.6 lb (23,9 kg), setting the motor as the benchmark in the highly competitive 250 cc class.
The KTM SX models features a map select switch allowing the racer to switch between 2 engine maps. Map 1 provides a linear, predictable power delivery, while Map 2 gives it the full beans with crisp, explosive power output.
Get ready for a full-on berm assault. The KTM SX and SX-F machines feature revised frame updates developed with input from KTM Factory Racing. For starters, the area around the rear shock mount is streamlined, with optimized engine mounts and cut-outs for improved chassis flex. The front area of the frame features optimized wall thickness with updated engine mounts.
Tank shrouds using bi-compound plastics channel air towards the radiators more efficiently, while a concise fuel tank roll, makes for a tighter, more secure fitment, reducing the chance of frame scrubbing and dramatically improving durability. All this works alongside the specially-developed rider triangle, to provide unmatched knee contact and gripping surfaces - especially when standing on the pegs.
Let's get the technical parts out of the way first; the 48 mm WP XACT AER forks fitted to the KTM SX and SX-F line-up features a capsulated air spring and pressurized oil chamber for progressive and consistent damping, while oil and air bypasses reduce pressure peaks. In combination with the mid-valve damping system, all this provides exceptional feedback and rider comfort. The fork also has settings which not only compliment the frame and rear linkage, but ensures stellar performance at all levels. Speaking of settings, these are easily adjusted via a single air pressure pre-load valve, as well as easy-access click adjusters for compression and rebound. Additionally, the WP air pump needed to adjust the fork's air pressure is provided as standard in the buy-pack.
Keeping things in check at the rear, the WP XACT rear shock uses settings directly from the KTM Factory Racing Teams. The frame and shock geometry deliver increased ground clearance at the linkage, reducing the risk of bottoming out. Small-diameter linkage bolts save weight, while the linkage seals refine rear shock response and advanced damping characteristics.
The KTM Motocross range has a special rear brake pedal adding additional stiffness, bending resistance and braking feel to the overall package. At the other end, a forged steering head connection and CNC-milled triple clamps, make for the perfect alignment of the fork tubes. This precise geometry of the fork clamps ensures highly responsive and smooth fork action - not to mention unwavering stability when charging across ruts and onto the podium.
Getting power hooked into the dirt is a tough job. However, hours of research and testing have led the KTM Motocross range to the Dunlop GEOMAX MX34. Providing unmatched stability and control at the highest level, the rubber features a rigid carcass and rubber compound that improves damping and absorption, maintaining performance up to 30% longer than previous models. Progressive Cornering Block Technology also improves grip in the berms, while the rear pattern has a tall and wide center block for desirable traction and control everywhere else. Lastly, this unique block arrangement works to dispel mud buildup, ensuring traction in even the muddiest of track conditions.
Count on a durable chain guide and chain guard and minimize the chances of hooking on external objects - especially in extremely muddy terrain while reducing dirt build-up around the swingarm and rear sprocket. The modified fixing points and routing of the wiring harness result in less prone to wear and damage.
Besides the expertly crafted, hydro-formed, laser-cut, and robot-welded frame being engineered to provide exceptional rider feedback and straight-line stability, the chassis 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.
The shock absorber geometry on the KTM SX and SX-F machines gives decent ground clearance for the linkage, with the topology-optimized die-cast footpegs being less susceptible to hooking on deep ruts, and take-offs when scrubbing.
With a strong focus on mass centralization, KTM SX and KTM SX-F engines are designed to concentrate rotating mass at the core, working in perfect harmony with the chassis. The result is lighter, more agile handling that runs rings around the competition.
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