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KTM Adds More Reasons To Love The 250 SX In 2019

KTM Adds More Reasons To Love The 250 SX In 2019

The legendary 2-Stroke KTM 250 SX will return for 2019 in a heavily revised package, boasting a new frame, plus a plethora of handling and engine upgrades. 

Primary power updates are an external power valve adjuster, for easy on-the-fly tuning, plus a new cylinder head exhaust port and all-new exhaust from front to back.

Other engine upgrades include a balance shaft to reduce unwanted vibration and harshness when on the throttle.

The new chassis is stiffer and is shared by all full-size KTM's, and is also slimmer with all new fairings that still preserve the aggressive 250 SX look. Handling is bolstered by the new seat and all-new WP AER 48 forks and rear mono-shock.


For 2019, the exhaust port has been machined to provide more precise power valve function, improving overall power delivery. By using two supplied springs, the power characteristics can be changed quickly and easily, ensuring the optimal settings for different tracks and rider preference. The lateral cylinder head brackets are now made of aluminum instead of steel and reduce vibration to levels of insignificance.


No more numb hands and feet. This engine design allows for the addition of a lateral balancer shaft, which helps keep engine vibrations to a minimum. This means you can keep charging harder, for longer.


All 2-stroke models feature a new CDI control unit with an advanced hardware which improves the starting behavior of the engine. The ignition curves remain unchanged.


When it comes to improved power delivery and performance, the new exhaust plays a key role and packs a punch that is hard to beat. In addition, its new shape provides slimmer ergonomics while still operating safely within the noise limits for racing.


The frame on the KTM 250 SX is brand-new and crafted from hydro formed Chromium Molybdenum steel tubes. It is robot welded for better consistency and improved quality. The improved stiffness has been specifically tailored to balance agile handling and comfort. The revised frame is designed to work in unison with the suspension for excellent 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. The engine in the KTM 250 SX frame has been raised by 1° around the swing arm pivot, improving the handling and the grip of the front wheel. New aluminum headstays drop weight further. For 2019, all SX frames feature the same highly durable powder coating as the KTM Factory machines and come with standard frame protectors. The lightweight aluminum subframe is 40 mm longer to improve rear fender stability.


The KTM 250 SX features an improved one-piece swing arm with 5 mm longer axle slots that allow greater wheelbase adjustment to suit varied conditions for tight turns on SX type tracks, or more straight-line stability when it gets fast and rough. Manufactured with a gravity die-cast process, the swingarm has exceptional strength at the lowest possible weight. The chain measurement markings on the swingarm are visible from above, making chain 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. For 2019, the aluminum spoke nipples feature a reworked design, which 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 and effectively transferring all the power to the ground.


All full-size SX models are fitted with the super-lightweight WP AER 48 front fork. It is a 48 mm USD air-sprung fork with separate functions for each fork leg, meaning damping functions are on the right side and the air spring is 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. (compression from top, rebound from bottom, 30 clicks each). For 2019, new settings on the damping side have improved the damping characteristics, providing great front end feel and control.


All SX models feature a DDC 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 AER 48 forks. It features high-quality machined and anodized components, which add a touch of class and give it appeal beyond just a functional necessity. Internally, the shock houses an updated main piston and new settings that provide improved damping characteristics, perfectly complimenting to the reworked front-end setup. 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.


All models in the SX range are fitted with newly designed lightweight polyethylene fuel tanks. The fuel capacity on the full-size SX models is still 7 liters, but the new shape improves the ergonomics. The filler cap has an inside thread that makes for easy and reliable closure.


The new airbox on the KTM 250 SX has been completely reworked to ensure better flow dynamics, and together with new intake snorkels, leads to optimal power and throttle response. Despite the obvious performance enhancements, the new 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.


All SX models have a newly shaped seat, designed to match the improved ergonomics. The seat cover features newly developed 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 safe and easy to handle.


The 2019 SX models feature the latest in-mold graphics, matching the new bodywork perfectly. They have a fast and aggressive style that screams READY TO RACE, leaving no doubt as to the bikes' high-performance intentions.