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The KTM 250 SX is certainly what comes closest to the ideal combination of weight and power or between performance and control. With its high-performance 2-stroke engine and state-of-the-art chassis, it is undoubtedly one of the fastest 250cc 2-stroke on the circuit.. This racing beast is the preferred choice for speed enthusiasts who particularly like the characteristic sound of 2 strokes..
Motor and muffler
Present for many years on motocross tracks, the KTM 2-stroke are among the fastest motorcycles to date. After years of development, these engines have now become the benchmark in terms of performance and technology and offer the ideal compromise between power, weight and control. More melodious than ever, especially at the highest speeds, the KTM 2-stroke have aroused the enthusiasm of the public and continue to make us vibrate today..
Motor
The 250 SX’s engine is the ultimate in 2-stroke technology, featuring a vibration-damping balance shaft and a highly reliable hydraulic DDS clutch. The TVC exhaust valve system is a major asset of the KTM 250 SX engine, rightly considered to be the most competitive 2-stroke in its class. 5-speed gearbox adds to driving pleasure.
Cylinder
The cylinder of the 250 SX, with a bore of 66.4 mm, has a TVC exhaust valve system. The exhaust outlet has been machined to ensure more precise operation of the exhaust valve control and to increase the overall level of performance. It is also possible to easily and quickly change the character of the engine thanks to the two springs provided for this purpose, so as to find the ideal settings (depending on the track or the preferences of the pilot). The cylinder head side mounting brackets are made of aluminum to almost completely dampen vibrations.
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.
Gearbox
The very strong 5-speed gearbox lends itself to all motocross tracks. The gears are perfectly matched to the power delivered by the 250 cc engine. Another strong point of this 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.
Balance shaft
No more numb hands or feet. The engine design allowed for the addition of a lateral balance shaft which helps to minimize vibration. Driving at a sustained pace for long hours is therefore all the less taxing.
Clutch
The 250 SX is fitted with a heavy-duty DDS (Damped Diaphragm Steel) clutch developed by KTM. This features a wear-free steel clutch housing and heat-resistant clutch discs. The use of a diaphragm spring instead of the usual coil springs also gives it greater flexibility. The diaphragm spring also has the advantage of being compact, which makes it possible to integrate a damping system in the clutch hub, to gain traction and durability. The Brembo hydraulic clutch system is also distinguished by its precision and progressiveness..
Carburetor
The 250 SX is fitted with a MIKUNI TMX carburetor. The settings of this 38mm flat-valve carburetor are matched to the air filter housing and exhaust structure to ensure a more linear and better balanced power delivery across the entire rev range..
Contact
All 2-stroke models have a CDI box and advanced components designed to improve engine behavior when starting. The ignition curves have not changed.
Crankshaft
At the heart of the engine, the crankshaft, with a stroke of 72 mm, guarantees superior maximum torque and power. Perfectly balanced, it is associated with a balance shaft to minimize vibrations. Ideally placed for optimal mass centralization, the crankshaft helps to enhance the agility and handling of the bike..
Cooling
Maintaining optimum engine temperature is essential to ensure consistent power delivery. The position of the radiators of the 250 SX, perfectly adapted to the design of the spoilers, makes it possible to lower the center of gravity and to reinforce the ergonomics. Thanks to digital fluid mechanics (CFD) and the clever cooling system implemented, this innovative system ensures that the engine components are kept at the ideal temperature to guarantee the highest level of performance, whatever 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..
Quiet
The exhaust system gives the engine a smoothness and liveliness that are hard to match. Its narrow shape brings a real plus in terms of ergonomics, while respecting the noise emission levels recommended in competition.
Frame
The chassis contributes to the feeling of osmosis between the pilot and his machine. The 250 SX’s chassis has not only been designed to mitigate the effects of the many irregularities in motocross terrain, but also to provide excellent feedback to the rider. The high-tech chrome-molybdenum steel frame provides the flexibility to absorb bigger shocks and boost the bike’s agility and stability at high speeds. On the 2019 model year, the engine was lowered by 1 ° from the swingarm axis, to improve handling and front wheel grip. The same is true for the 2020 version. The damping characteristics of the suspensions have been optimized on the 2020 version. The suspension settings have in particular been revised to provide additional flexibility and comfort. Combined with a powerful and dynamic chassis, these suspensions reinforce the exhilarating behavior of the 250 SX..
Framework
The frame is made of hydroformed tubes in chromium-molybdenum steel, assembled by automated welding, in order to guarantee the highest levels of quality. The rigidity has been specially designed to guarantee unparalleled handling. The excellent cohesion with the 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. The frame of all SX models inherits the very durable lacquer coating (used on KTM Factory machines) and standard frame protectors. The rear buckle, made of lightweight aluminum, reinforces the stability of the rear shell and provides excellent support for the rider, despite its low weight.
Swinging arm
The one-piece swingarm, obtained by high-pressure die-casting, has been designed to offer rock-solid strength at minimal weight. It allows a wide range of adjustments at the rear wheel and makes it possible to reduce the wheelbase to increase handling on narrow and winding tracks or, on the contrary, to increase the wheelbase to promote stability on fast sections. The chain measurement marks shown on the swingarm are visible from above, which greatly facilitates adjustments.
Wheels
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 nipples have been revised to limit the frequency at which it is necessary to retighten the spokes. The wheels are fitted with latest generation DUNLOP Geomax MX 3S tires, to maximize power transfer to the ground and gain stability.
Front suspension
All full-size KTM SX models feature the ultra-light WP XACT AER fork. The arms of this 48mm USD air fork have a different function: damping is 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 damper arm design and can be adjusted to suit track conditions or rider preference. To fine-tune each of these settings (compression from the top and rebound from the bottom), all you have to do is turn the new 30-notch dial provided for this purpose above each fork leg..
Rear suspension
The WP XACT DDC shock absorber, present on all KTM SX models, has been developed taking into account the architecture of the frame and the swingarm, just like the link system and the WP XACT AER fork. Beyond its purely functional aspect, this little gem seduces by the care taken in the finishes, and in particular by its high-quality machined and anodized components. Fully configurable in high speed and low speed compression, it can be adapted specifically to track conditions or rider preferences.
Triple trees
All KTM SX models use high quality CNC machined triple trees, a hallmark of KTM. To account for the flexibility of the frame and fork, engineers have firmed the upper triple clamp (22mm offset on all models). The front axle, working in perfect harmony with the frame, makes the bike even more stable and agile. Two positions are possible for the handlebar trigger guard with damping rubber intended to attenuate vibrations. Hour meter, standard on the upper triple clamp of all SX models, tracks hours spent in the saddle and indicates when it’s time for service.
Brakes
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 KTM SX range have an ultra-light polyethylene fuel tank. The shape of this tank has been designed to be more ergonomic, while maintaining the same capacity (7 liters). Fuel tank cap with internal thread ensures easy and reliable closing.
Air filter housing
The 250 SX’s air filter housing optimizes flow dynamics. Combined with the intake snorkels, it ensures maximum power deployment and excellent recoveries. In addition to the obvious performance gain, the 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.
Ergonomics and comfort
The feeling of being one with the motorcycle depends mainly on the ability of the rider to transfer body weight quickly and the efficiency of the maneuver. Particular attention has been paid to the fairing and ergonomics of the motorcycle to guarantee an optimal level of performance. To allow the rider to find a more natural riding position and to maintain perfect control of the motorcycle, it is possible for him to adjust the position of the handlebars according to his preferences and the conditions. As the rider primarily interacts with the saddle, footrests and handlebars, these three contact points play a key role in balance and control. To stay one step ahead of the competition, a pilot is above all looking for a machine that combines power and agility. The 2020 250 SX, like all models in the SX range, perfectly meets these conditions and offers cutting-edge ergonomics..
Saddle
The saddle of all KTM SX models confirms the progress made in terms of dynamism and ergonomics. The saddle cover 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.
Handlebar
All full-size KTM SX models feature the same super strong aluminum profile handlebars, 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. Handlebar features handlebar foam as well as hand guards that are easy to put on or take off.
Footrest
Sophisticated ‘zero dirt’ footrests prevent gear selector clogging even when driving through deep ruts.
Dressing and graphics
The 250 SX has become a true icon for fans of 2-stroke motorcycles. Even if the characteristic sound of this engine invites nostalgia, this mechanism has undergone many changes over the years. The KTM factory riders collaborated on the development of the fairing with the KTM R&D specialists and the design agency Kiska GmbH, with a single watchword: to create a perfect harmony between the rider and the machine and to offer a motorcycle to the cutting edge of modernity. Particular attention has been paid to the contact points, so as to guarantee total freedom of movement for the pilot and optimize control of the vehicle. The particular shape of the front and rear hulls is a perfect example of the ingenuity of the design: it guarantees maximum stability, for minimum weight..
Software and electronics
The 250 SX has electronics to match its ambitions. Simplicity of 2-stroke in its purest form, the hour meter (available as standard) records the hours spent in the saddle while the tachometer (available as an option) allows you to find the ideal speed.
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Replaces
250 SX 2019
Model marketed in
2012
2013
2014
2015
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2017
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2020
The technical aspect
2020 KTM 250 SX
- Frame
- Frame: Central tubular steel frame
- Tank: 7.5 liters
- Seat height: 950 mm
- Wheelbase: 1,485 mm
- Dry weight: 95 kg
- Train before
- WP inverted telehydraulic fork Ø 48 mm, deb: 310 mm
- 1 disc Ø 260 mm, 2 piston caliper
- 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
, 2 stroke - Cooling: by water
- Carburetor Ø 38 mm
-
249 cc
(66.4 x 72 mm) -
≈ 55
ch - Weight ratio /
power
: 1.73
kg / hp - Crit’air:
Detached pieces
exhaust
motor
fluid
electricity
filtration
braking
chain kit
Competitors
Gallery
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