2019 KTM 250 SX-F


A strategic model of the cross range, the two-and-a-half SX-F is back in top form in 2019. With its many innovations, the KTM 250 SX-F is once again called upon to reign supreme on the motocross tracks. Not content with being one of the lightest in its category, it offers unparalleled power deployment, but perfectly controllable. This is the reason why it appeals to both amateurs and professionals. The secret to a good engine is its ability to manage power with maximum efficiency. This package has serious advantages in this area and will have no trouble leading you to victory..


The 250 SX-F’s engine is considered one of the most powerful in the MX2 class paddock. Capable of reaching 14,000 rpm without flinching and with phenomenal torque present throughout the rev range, this engine has a lot of responsiveness. Its compact architecture allows better mass centralization and exceptional road holding. Let us recall in passing that it weighs only 25.9 kg, electric starter included.

Cylinder head

The centerpiece of the compact DOHC (double overhead cam) engine, the new avant-garde cylinder head features two overhead camshafts responsible for actuating the titanium valves (32.5 mm intake, 26.5 mm exhaust ) using ultra-light rockers coated with a DLC coating. For 2019, the camshaft on the exhaust side benefits from a new distribution designed to better balance the deployment of power.


The crankshaft of the KTM 250 EXC-F offers greater rigidity. The big end bearing has two bearing shells force-fitted directly into the crankshaft crankpin. This design is the necessary condition to achieve extremely high speeds and unmatched engine power of 250 cm.³. This design increases engine life and allows longer crankshaft service intervals; a benefit for the customer in terms of time, effort and costs.

Engine housings and covers

Using the high pressure die casting process results in a relatively compact and even lighter crankcase, while maintaining strength and durability. The crankcase design enabled KTM engineers to bring the shaft assemblies closer to the center of gravity, so as to better centralize the masses and enhance driving pleasure. Another interesting innovation to keep the engine as radiant as in its early days: engine crankcase covers with an elaborate surface structure, intended to reduce the wear caused by the rider’s boots.


The KTM 250 SX-F now features a new, more robust 5-speed gearbox. The transmission ratios of the previous version have been renewed, but the gears have all been improved and strengthened. Another highlight of the transmission is the “zero dirt” design of the selector. Designed on the same principle as the footrest, it prevents the accumulation of dust and allows the gearbox to remain operational in all conditions.

Engine management

Keihin Electronic Fuel Injection Engine Management System features a new 44mm injection body. The unique position of the injector ensures excellent atomization of fuel and air entering the combustion chamber. The engine is all the more lively and generous when opening the throttle. For added convenience, independent adjustment mechanisms have been provided for cold start and idle. The MAP (absolute pressure sensor) probe, which has been tightly sealed, makes the system even more reliable. The modifications to the gas cable were intended to simplify the routing of the cables and make them more accessible. The control unit (ECU) of the 2019 models offers new mappings adapted to the new design of the exhaust and the cylinder head, with the aim of better managing the traction control and the departure control. To deliver maximum power, it allows the characteristics of the engine to be adapted to each speed, according to the data communicated by the gear sensor engaged..

Cylinder and piston

The cylinder, with a bore of 78 mm, accommodates a forged piston of the bridge-box type of the highest quality, manufactured by CP. In addition to its extremely rigid structure, it stands out for its unique crown shape adapted to the high level of compression of the combustion chamber. The compression ratio (14.4: 1) and the reduced oscillating masses give the engine an extremely responsive character..

Balance shaft

To compensate for the inertia force generated by the 250 SX-F, the engine is fitted with a multifunction balancer shaft. In addition to its beneficial effect on the vibration level, the latter is also responsible for driving the timing chain and the water pump..


The new DS (Diaphragm Steel) clutch features a durable one-piece clutch housing and main gear (made of heavy-duty billet steel), providing rock-solid reliability. It is fitted with extremely heat-resistant steel motor friction discs preloaded by a diaphragm spring. The function of this system is to optimize the clutch and instantly transmit the available power to the rear wheel as soon as you release the clutch. This type of design has the effect of significantly reducing the force exerted on the clutch, which is even more true with the Brembo hydraulic system..

Electric starter

Every minute is precious in competition. The electric starter allows you to get back into the race without wasting time. The electric starter, standard on the KTM 250 SX-F, uses Mitsuba’s robust electric motor. The foolproof reliability of this device saves precious start-up time at crucial points in the race..

Mapping selector on the handlebars

All 4-stroke models have a handy mapping selector on the handlebars, which allows you to act on traction control and departure control and to switch between power curves (Standard Advanced). Traction control is a unique function with a new setting on the 2019 models. It guarantees more efficient traction and better control of the bike during acceleration phases, especially on demanding tracks. This function can be activated, even in full action, by means of the map selector·on the handlebars. When the engine is at idle, all you have to do is press both switches simultaneously to activate the start control as well, and thus leap out of the gate more quickly. Thanks to a new set-up, the starting control can now take advantage of the traction control to limit wheel slip and gain traction. In addition to standard engine modes, the mapping selector provides access to other engine modes for maximum stroke options.


Maintaining optimum engine temperature is essential to ensure consistent power delivery. For this purpose, the KTM 250 SX-F can count on new radiators lowered by 12 mm compared to its predecessor. This position, perfectly suited to the design of the new spoilers, lowers the center of gravity and improves ergonomics. Thanks to computational fluid mechanics (CFD) computational simulation calculations and the clever cooling system implemented, this innovative system ensures that engine components are kept at the ideal temperature to guarantee the highest level of performance, whatever the are the conditions. The special protections fitted to the radiators not only serve to protect them from projections of stones and other debris, but also to distribute the impact force of the shock around the radiators..


The new exhaust system, provided on all 4-stroke models, gives the engine a smoothness and liveliness that are hard to match. It has a new exhaust manifold (specific to the model) and a small additional chamber, that is to say an evolved resonator called FDH (Flow Design Header). The silencer benefits from a new aluminum casing and a new end cap. The interior of the silencer has also been reworked. The new structure allows the exhaust to be removed without having to remove the shock absorber and facilitates access to the latter. It has another advantage from the point of ergonomics, because it refines the silhouette of the motorcycle while respecting the regulatory noise emission levels..


The KTM 250 SX-F relies on a new high-tech steel frame capable not only of optimizing the rider’s feel, but also of providing excellent feedback. The flexibility of the frame has been specially designed to increase the agility and stability of the motorcycle at high speeds and to make the riding experience as intuitive as possible..


The completely redesigned frame of the KTM 250 SX-F promotes the dynamic riding styles that are a must in the MX2 class. As with the rest of the SX range, the chromium-molybdenum steel frame consists of hydroformed tubes assembled by automated welding, in order to guarantee the highest level of quality. The rigidity has been optimized to enhance handling. The excellent cohesion with the WP suspensions also offers the perfect compromise between agility and stability at high speed. With the self-cleaning “zero dirt” footrests that won’t jam when pulled back into position, you are in complete control, whatever the conditions. All 4-stroke model frames feature three new brackets to facilitate the mounting of an optional composite skid plate (offered in the KTM PowerParts accessory line). The frame of all 2019 SX models inherits a very durable powder coating (like on KTM Factory machines) and standard frame guards. The new rear buckle, made of lightweight aluminum, has been lengthened by 40mm to promote mobility in the saddle and improve the stability of the rear shell.

Swinging arm

The KTM 250 SX-F’s new one-piece swingarm, obtained by high-pressure die-casting, has been designed to offer rock-solid resistance while keeping weight to a minimum. The extra 5mm of play in the axle housing allows the wheel to move backwards to improve stability on chaotic tracks. The chain measurement marks shown on the swingarm are visible from above, which greatly facilitates adjustments.


Equipped with ultra-light CNC machined hubs and premium Excel rims, the wheels of all SX models guarantee maximum stability despite a limited weight. The aluminum spoke heads on the 2019 models have been revised to limit the frequency at which the spokes need to be retensioned. The wheels are fitted with the latest generation Dunlop Geomax MX 3S tires, to maximize power transfer to the ground and gain stability.

Front suspension

All full-size SX models feature the ultra-light WP AER 48 fork. The legs of this 48mm inverted air fork have different function, damping functions are on the right, the air spring is on the left. The left fork leg has a dual chamber and air cartridge system to prevent pressure loss. Should the outer seal ever leak, the pressure exerted inside the inner cartridge will keep the motorcycle in its normal position. The extremely easy to adjust air spring can be adjusted to the weight of the rider using a single valve and the air pump supplied with the motorcycle. The right fork leg includes a cartridge specifically designed to meet the demands of the single damping arm design and can be adjusted to suit track conditions or rider preferences. All you have to do is turn the dial 30 notches to the desired position (compression up and rebound down). New damping settings on 2019 models improved front axle control and feel.


State-of-the-art Brembo brakes are standard equipment on KTM motocross bikes. Combined with Wave brake discs renowned for their lightness, they provide the braking power expected by the most daring riders..

Fuel tank

All models in the SX range feature a new, ultra-light polyethylene fuel tank. The capacity on standard size SX models is still 7 liters, but the shape of the tank is more ergonomic. The fuel tank cap with internal thread ensures easy and reliable closing. To ensure better fuel pump reliability on 4-stroke models, KTM engineers have chosen to route the hoses from the inside..

Air filter housing

The KTM 250 SX-F’s air filter housing has been completely redesigned to optimize flow dynamics. Associated with the new intake snorkels, it ensures an exceptional power deployment and level of acceleration. In addition to the obvious performance gain, the new design also serves to better protect the air filter against clogging. The rigid support for the large Twin-Air air filter has been designed to minimize installation errors. As on previous models, filter maintenance is carried out in record time and without tools, an original feature, typically KTM.


The saddle of all SX models has been redesigned to confirm the improvements made in terms of ergonomics. The saddle cover now incorporates silicone bands designed to optimize grip and feel. A long screw inserted on the side helps to better fix the saddle to the motorcycle and makes handling easier and safer.


All full-size SX models feature the same super strong aluminum tapered handlebar, manufactured by NEKEN. Two positions are possible for the handlebar trigger guard with shock absorber pads. Right: an ODI vulcanized handle available as standard; on the left: an ODI lock-on handle as comfortable as it is practical, thanks to its mounting system without glue or wire. The handlebar foam has also been revised as well as the hand guard which is now much easier to put on or take off. With this handlebars, victory stretches out its arms to the pilots.

Battery and wire harness

To start the engine every time, especially in cold weather, the starter motor of the SX-F models is powered by a new, ultra-light and more efficient 2 Ah lithium-ion battery. The voltage regulator / capacitor assembly now brings all the electrical components together under the saddle, to make the system even more reliable.

What you must remember





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      250 SX-F 2018
      250 SX-F 2018

      Model marketed in


      The technical aspect

      2019 KTM 250 SX-F

      • Frame
      • Frame: Central tubular steel frame
      • Tank: 7 liters
      • Seat height: 950 mm
      • Dry weight: 99 kg
      • Train before
      • WP inverted telehydraulic fork Ø 48 mm, deb: 310 mm
      • 1 disc Ø 260 mm, 2 piston caliper

      KTM 250 SX-F 2019 technical

      • Transmission
      • 5-speed gearbox
      • secondary by chain
      • Rear axle
      • WP mono-shock, deb: 300 mm
      • 1 disc Ø 220 mm, 1 piston caliper
      • Motor
      • Single cylinder
        in line
        , 4 stroke
      • Cooling: by water
      • Injection Ø 44 mm
      • 2 ACT
      • 4 valves
      • 249.90 cc
        (78 x 52.3 mm)
      • ≈ 45
      • Weight ratio /
        : 2.20
        kg / hp
      • Compression: 14.4: 1
      • Crit’air:

      Detached pieces


      chain kit


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