2020 KTM 250 SX
Exhilarating Power And Control: Whether its power-to-weight or power and control, the KTM 250 SX is the perfect combination of all that counts. Featuring a high-performance 2-stroke engine fitted within a state-of-the-art chassis, this powerhouse is undoubtedly the fastest 250 cc 2-stroke on track. This proven race weapon is the right choice for those who thrive on that glorious 2-stroke sound while smashing out one hot lap after the next.
- KTM 2-strokes have been tearing up MX tracks for decades and are undoubtedly the fastest on the track today. Thanks to years of ongoing development, these engines are the benchmark in performance and technology, with the perfect combination of power, weight and control. Through melodic high-RPM screams, KTM 2-strokes continue to deliver thrilling high-performance harmonics.
- Power progression: The engine of the KTM 250 SX features the latest 2-stroke technology, with a counter-balance shaft for low engine vibration, as well as a reliable hydraulically operated DDS clutch. It has a twin-valve controlled power valve, which contributes massively to making the KTM 250 SX engine the most competitive 2-stroke in its class. Powering through its 5-speed transmission truly is an exhilarating experience.
- Cylinder: The cylinder on the KTM 250 SX has a bore of 66.4 mm and is fitted with a Twin-Valve powervalve system. The exhaust port is machined for precise power valve function, providing excellent overall power delivery. By using the two supplied springs, the power characteristics can be changed quickly and easily, ensuring optimal settings for different tracks and rider preference. The lateral cylinder head brackets are made of aluminum and reduce vibration to levels of near insignificance.
- Crankcases and engine covers: The compact engine cases are manufactured using a high pressure die-cast production process that helps with weight reduction, while retaining strength and durability. The design allows for optimal shaft arrangements closer to the center of gravity, resulting in perfect mass centralization and easier rideability. The engine covers feature a smart surface structure that reduces wear caused by the rider's boots, keeping them looking as fresh as the day you bought it.
- Transmission: The engine has a strong 5-speed gearbox built to suit any kind of motocross track. The gear ratios were developed specifically to match the power delivery of the 250 cc engine. The gearbox also features a "no-dirt" gear shifter. Similar to the foot peg design, it prevents the build-up of dirt and ensures the next gear is always available, no matter what the conditions.
- Highly effective cooling: Maintaining the optimal engine temperature is crucial to ensuring consistent horsepower throughout the ride. The KTM 250 SX features radiators which are positioned for a lower center of gravity. Their design matches the shrouds perfectly and offers a great slim feel to the ergonomics. By using CFD technology (computational fluid dynamics) together with a clever coolant circuit routing, the innovative system ensures the optimum engine temperature for the highest performance, no matter what the conditions. The radiators also feature special protectors that serve not only as protection from flying rocks and debris but also as a brace that disperses energy around the radiators in the event of an impact.
- For sound of power: When it comes to power delivery and performance, the exhaust plays a key role and packs a punch that is hard to beat. In addition, its narrow shape provides slimmer ergonomics while still operating safely within the noise limits for racing.
- The chassis forms an integral part of the feeling a rider has with his bike. The chassis on the KTM 250 SX is designed to provide accurate feedback between the track and the rider, while also reducing the harshness of typical motocross terrain. The high-tech steel frame is made from chrome-moly and features optimized flex characteristics that soak up those big hits while also delivering excellent agility and high-speed stability. In 2019, the engine was raised in the frame by 1° around the swing arm pivot, improving the handling and the grip of the front wheel and remains the same for 2020. For 2020, the suspension features improved damping characteristics. The reworked settings offer a slightly softer, more comfortable feel that, together with the dynamic, performance-oriented chassis, ensure that the KTM 250 SX remains one of the most thrilling rides out there.
- Control at the core: The frame is professionally crafted from hydroformed chromium molybdenum steel tubes that are robot welded, ensuring the highest levels of consistent quality. The stiffness has been precisely tailored for the most dynamic handling, and works in perfect harmony with the suspension to provide nimble agility without losing high-speed stability. The frame also features “no dirt" footpegs, which have a simple but effective self-cleaning system that ensures the footpegs return to their original position, providing complete control in all conditions. All SX frames feature the same highly durable powder coating as the KTM Factory machines and come with standard frame protectors. The subframe is made from lightweight aluminum, providing rear fender stability and strong support for the rider at little extra weight.
- Swingarm: The one-piece swingarm is manufactured using a gravity die-cast production process for exceptional strength at the lowest possible weight. It offers a wide range of adjustment for the rear wheel, allowing for a shorter wheelbase on tighter, twisty tracks, or a longer wheelbase for greater stability on longer, more choppy tracks. The swingarm's chain measurement markings are visible from above, making adjustment simpler and more accurate.
- KTM uses lightweight, CNC-machined hubs and high-end Excel rims on all SX models, guaranteeing maximum stability and minimum weight. The aluminum spoke nipples feature a design that conveniently reduces the frequency with which the spokes need to be tightened. The wheels are fitted with the latest DUNLOP GEOMAX MX 3S tires, delivering maximum grip and stability, effectively transferring all the power to the ground.
- Front suspension: All full-size KTM SX models are fitted with the super-lightweight WP XACT front fork with AER technology. It is a 48 mm USD air-sprung fork with separate functions in each fork leg, with damping functions on the right side and the air spring on the left. The left leg features a two-chamber system with a capsuled air cartridge, helping prevent loss of air pressure. Essentially, this means that in the rare case of a leaking outer seal, the internal cartridge pressure keeps the bike in a normal position. The air spring is exceptionally easy to use and can be adjusted to any rider weight via a single air valve and the air pump that is supplied with the bike. The right fork leg integrates a damping cartridge to fit single damping leg requirements and can be adjusted to the track conditions and the rider's preferences. Additionally, the fork top caps have a new design for improved, easy adjustment (compression from top, rebound from bottom, 30 clicks each).
- Rear suspension: All KTM SX models feature a WP XACT DDC (Dynamic Damping Control) monoshock, which has been developed to work as a complete unit with the entire frame and swingarm architecture, as well as the linkage system and the WP XACT fork. It features high-quality machined and anodized components, which add a touch of class and give it appeal beyond just a functional necessity. It is fully adjustable, including high and low speed compression, allowing you to set the shock up precisely to suit any track and rider's preferences.
- Triple clamp: All KTM SX models feature top quality, CNC-machined triple clamps which have become a KTM trademark. The triple clamp has a precisely calculated stiffness and offset (22 mm offset for all models) to match the flex characteristics of the frame and fork. The result is a front end that works in perfect harmony, contributing positively to the overall handling and stability. The rubber damped handlebar fixation reduces vibration and also allows for some adjustment with two different mounting positions. An hour meter is fitted as standard on the upper triple clamp on all SX models, keeping the rider informed of the number of hours spent tearing up the track and when the next service is due.
- Highly effective braking: High-tech BREMBO brakes have always been standard equipment on all KTM motocross bikes. Combined with lightweight wave discs, the renowned system provides the highest level of braking efficiency, enabling you to out-brake the competition.
- Shaped for mobility: All models in the KTM SX range are fitted with lightweight polyethylene fuel tanks. The shape of the fuel tank allows for slim ergonomics without compromise to the 1.98 gallon fuel capacity. The filler cap has an inside thread that makes for easy and reliable closure.All models in the KTM SX range are fitted with lightweight polyethylene fuel tanks. The shape of the fuel tank allows for slim ergonomics without compromise to the 1.98 gallon fuel capacity. The filler cap has an inside thread that makes for easy and reliable closure.
- Maximum breathability: The airbox on the KTM 250 SX ensures optimal flow dynamics, and together with its intake snorkels, leads to maximum power and quick throttle response. Despite the obvious performance advantages, the design also offers maximum protection against soiling of the air filter. The large Twin-Air air filter is mounted on a cleverly designed stiff cage that minimizes incorrect installation. As found on previous models, filter maintenance is quick and easy and does not require tools - a standard, original feature from KTM.
- A rider's ability to work in unison with his bike depends on how quickly and effectively he can shift his weight around the motorcycle. KTM focused extensively on creating bodywork and ergonomics that allow for the highest levels of performance. This ensures that the natural riding position offers the best possible control and, through various handlebar positions, can also be adjusted to suit every rider and condition. A rider's main connection to the motorcycle comes through the seat, footpegs and handlebars and these three touch points play a vital role in maintaining balance and control. The rider is always looking for a fast and competitive motorcycle with a great feeling of controlled agility. The 2020 KTM 250 SX, like the entire SX range, ticks all the right boxes, especially when it comes to race-ready ergonomics.
- Comfort meets performance: All KTM SX models feature a seat that perfectly matches the range's dynamic performance-oriented ergonomics. The seat cover features silicone strips that provide better feel and grip for the rider. The seat is conveniently fixed to the bike using one long, lateral screw, making it secure and easy to handle.
- Ultimate rider control: All full-size KTM SX models are equipped with the same high-strength aluminum tapered handlebar, made by NEKEN. The handlebar is fixed in rubber damped mountings, which allow for two different positions. The handlebars come standard with an ODI vulcanized grip on the right side and a comfortable ODI lock-on grip, which does not require any wire or glue, on the left. They also feature a bar-pad with a cover that can be attached and removed with little effort.
- Staying connected: Sophisticated ´no-dirt´ footpegs prevent smudging up the pegs, even when digging in deep ruts. Looking for a higher riding position? Then just mount the footpegs of the KTM 2018 EXC models, which are 6 mm higher than the SX versions.
- The KTM 250 SX has become an icon amongst 2-stroke fanatics, but for this bike, the classic sound it produces is where the nostalgia ends. A combined effort between KTM's factory riders, KTM R&D and Kiska Design has resulted in a highly effective modern-looking motorcycle with bodywork that achieves complete harmony between rider and bike. The main goal of the designers is to provide the perfect contact points for the rider, allowing maximum freedom of movement and improved motorcycle control. Examples of the intelligent design can be seen in the I-beam structure of the front and rear fenders, which guarantees maximum stability and the lowest possible weight.
- Look the part: The modern design and graphics ensure that it is not only about function, but an impressively fast and aggressive look that sends a clear message to the competitors.
- Absolute performance purity is the name of the game when it comes to the KTM 250 SX. Undiluted 2-stroke simplicity, with an hour meter to keep a check on how long you've been shredding and an optional rev counter to assist with perfect setup.
- Displacement: 249 cm³
- Design: 1-cylinder, 2-stroke engine
- Bore: 66.4 mm
- Stroke: 72 mm
- Starter: Kickstarter
- Transmission: 5-speed
- Clutch: Wet, DDS multi-disc clutch, Brembo hydraulics
- EMS: Kokusan
- Frame design: Central double-cradle-type 25CrMo4 steel
- Front suspension: WP XACT-USD, Ø 48 mm
- Rear suspension: WP XACT Monoshock with linkage
- Front brake: Disc brake
- Rear brake: Disc brake
- Front brake disc diameter: 260 mm
- Rear brake disc diameter: 220 mm
- Chain: 5/8 x 1/4"
- Steering head angle: 63.9 °
- Engine Type
- 1-cylinder, 2-stroke
- 249 cm³
- Bore and Stroke
- 66.4 mm x 72 mm
- Fuel System
- Front Suspension
- WP XACT-USD, Ø 48 mm
- Front Brakes
- Disc brake
- Rear Suspension
- WP XACT Monoshock with linkage
- Rear Brakes
- Disc brake
- Final Drive
- Chain: 5/8 x 1/4 in.