KTM 250 SX 2020

Produktinfo

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.

Motor og eksos

Motor og Eksos

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.

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 […]

IGNITION

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

EXHAUST

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.

ENGINE

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 […]

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 […]

CRANKSHAFT

At the heart of the engine, the crankshaft delivers a 72 mm stroke that produces optimal torque and revs. It is ideally balanced and with the added aid of a counter balancer shaft, minimum vibration is guaranteed. The crankshaft is situated in the perfect position to centralize mass, contributing to better agility and handling.

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 […]

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 […]

CLUTCH

The KTM 250 SX is fitted with the extremely durable, KTM-developed DDS clutch (damped diaphragm steel), with a wear-free steel basket and heat resistant clutch plates. It uses a diaphragm spring instead of the usual coil springs, which results in considerably easier clutch action. The diaphragm spring is also compact enough to allow for a […]

CARBURETOR

The KTM 250 SX is fitted with a MIKUNI TMX carburetor. The settings on the 38 mm flat slide carburetor perfectly suit the airbox and exhaust design, providing smooth, controllable power all the way through the rev range.

BALANCER SHAFT

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.

Chassi

Chassi

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.

WHEELS

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 […]

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 […]

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 […]

REAR SUSPENSION

All KTM SX models feature a WP XACT 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 […]

FUEL TANK

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 7 liter fuel capacity. The filler cap has an inside thread that makes for easy and reliable closure.

FRONT SUSPENSION

All full-size KTM SX models are fitted with the super-lightweight WP XACT 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 […]

FRAME

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” […]

BRAKES

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.

AIRBOX

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 […]

Ergonomi og komfort

Ergonomi og komfort

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.

SEAT

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 safe and easy to handle.

HANDLEBAR

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 […]

FOOTPEGS

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.

Bodywork og dekaler

Bodywork og dekaler

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.

DECALS

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.

Programvare og elektronikk

Programvare og elektronikk

Absolute performance purity is the name of the game when it comes to electronics and the new 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.

Tekniske detaljer

TECH DETAILS

Engine
Design
1-cylinder, 2-stroke engine
Displacement
249 cm³
Bore
66.4 mm
Stroke
72 mm
Starter
Kickstarter
Transmission
5-speed
Clutch
Wet multi-disc clutch, hydraulically actuated
EMS
Kokusan
Chassis
Frame design
Central double-cradle-type 25CrMo4 steel
Front suspension
WP XACT-USD, Ø 48 mm
Rear suspension
WP XACT Monoshock with linkage
Suspension travel (front)
310 mm
Suspension travel (rear)
300 mm
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 °
Ground clearance
375 mm
Seat height
950 mm
Tank capacity (approx.)
7.5 l
Weight READY TO RACE (without fuel)
95.5 kg
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