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The new KTM 250 SX with its all-new engine has one of the best power-to-weight ratios in the world of dirt, forming the ultimate fist against more complex 4-stroke rivals. With the grunt to devour all sorts of tracks and terrains, and a lightweight chassis keen to skim the surface, this lovechild of KTM’s R&D and Motorsport departments is born to lead the next pack of winners into a hazy blue future.


The engine of the 250 SX has been known and

respected for being the most powerful 2-stroke

engine in its class. But we thought the segment

could use an extra push and a solid statement:

2-strokes have a future at KTM. Their

outstanding power-to-weight ratio, low cost and

simplicity see to that. Putting our money where

our mouth is, we gave the 250 SX engine an all

new architecture with a new shaft arrangement

for better mass centralization, a new cylinder

with twin-valve controlled power valve, a new

counter balance shaft for less engine

vibrations, a 5-speed transmission and a

hydraulically operated DDS clutch. This

compact firecracker truly outshines the

competition with its ripping performance and is

the right choice for lovers of low purchasing and

maintenance costs. Oh, and of course don’t

forget that belly tingling 2-stroke symphony

when you’re on the pipe.


The newly developed cylinder of the 250 SX -

with a bore of 66.4mm - has all-new ports and

is fitted with an overhauled power valve system.

This system features a sophisticated

mechanism for the lateral support exhaust

ports, providing smooth and controllable power

on tap. Furthermore, it’s possible to change the

bike’s mood in seconds thanks to two supplied

powervalve springs. Limitless settings for

different tracks and preferences are up for

grabs. Throw everything you have at it; new

water jackets in the cylinder and head will take

care of excess heat and reworked lateral

cylinder head brackets allow a more efficient

fixation of the engine to the frame via

lightweight  head stays. Yes, this is a serious

piece of kit.


These all-new die-cast engine cases feature a

8mm higher clutch shaft and a 27mm higher

crankshaft, resulting in better mass

centralization. Which is nice if you care about

sweet rideability. In addition, it allows the

implementation of a counter balance shaft. So

your ride will be as relaxed as it is rapid. Plus,

your new favorite engine will keep looking as

fresh as the day you bought it: redesigned

engine covers feature a smart surface structure

in order to reduce the wear caused by the

rider’s boots.


The 250 SX employs the KTM-developed DDS clutch (damped diaphragm steel) with a

wear-free steel basket and extremely heat resistant clutch plates. This clever design employs a

diaphragm spring instead of the usual coil springs, which makes for a considerably easier clutch action.

A diaphragm spring also leaves sufficient space for a damping system to be integrated into the clutch hub.

The goal was traction, yes, but durability as well. On top of that, it is fitted with a lighter basket, a

reworked inner hub and a pressure plate providing better oil supply and unsurpassed cooling.

Of course, light operation and telepathic amounts of control are what make this particular clutch,

a hydraulic Brembo clutch.      


Say goodbye to numb feet and hands. The new

engine design allows the implementation of a

lateral counter balance shaft in order to reduce

the vibration level drastically (50% lower level

on handlebar and foot pegs). You know what

that means: more comfort, more smiles.


This reworked 5-speed gearbox has the same

gear ratios as its predecessor, but our

engineers took a close look at the mechanism

in order to provide you with more precise and

easier shifting. Keeping safety in mind, an

advanced ´No Dirt´gear lever design prevents

muck from blocking the joint. Because even dirt

lovers hate mud when it’s in the wrong places.


The engineers meticulously tuned the

expansion chamber for maximum power. An

advanced 3-D production process now

guarantees higher precision manufacturing, so

this little screamer is as tough as it is strong.


Its 72mm stroke stayed, the rest is brand new. Rebalanced, revamped and

set-up with a counter balance shaft to kill vibrations, not your vibe.      


As of model year 2017, all KTM 2-stroke

models are fitted with new MIKUNI TMX

carburetors, replacing the Keihin products. This

38mm flat slide carb lives to provide smooth

and controllable power all the way up to the

limiter. And it’s less sensitive to different

altitudes and temperatures, so you can pin it

wherever, whenever.


KTM engineers just love dropping weight year after year. The result: the 2017 SX

models are the slimmest, lightest dirt bikes out there.


The airbox design offers maximum protection of the air filter against soiling,

while ensuring maximum airflow. The large twin-air filter is mounted in a stiff cage,

which at the same time holds the system in place. This design is so simple,

you could still pop a fresh one in with a face full of mud. Without tools. In seconds.  


The cast aluminum design offers low weight and a perfect flex behavior.

The single-component casting process eliminates any inconsistencies

and inherent weak points created by welding. It’s better looking too.      


Tailored to meet the needs of the world’s fastest backsides, this durable

seat offers great comfort. For MY2017, a new cover pampers its riders

even more with better feel and grip.      


The high-tech, lightweight chrome-moly steel frame has a knack for easy

handling, outlandish rideability, precise cornering and excellent stability.

You can also count on high torsional rigidity and low longitudinal stiffness.

This results in better absorption of the energy created from the front and rear

suspension, sucking up jumps and bumps. In short: more comfort and less

rider fatigue. Laterally attached, lightweight  engine head stays

(the connection between cylinder head and frame) contribute to  precise

cornering and a reduced vibration level. The engineers were able to pull

off all that, while making their frame a big fat kilogram lighter than that of

the lightest competitor on the market. In addition, it is easier to maintain,

easier to work on and supplies more space for the tank and other

components. The bike also features an extra-light subframe made of stable aluminum profiles,

which tiptoes the scales at less than 900g.  


A lightweight polyethylene tank with a capacity of 7.0 liters of juice.

The filler cap has an inside thread, which makes for easy and reliable closure.


KTM’s proven cooling system routes the coolant from the cylinder head

through the frame triangle, directly to aluminum radiators made by WP.

Due to flow optimized internal circulation and CFD-calculated air ventilation,

the system is superbly efficient. In addition, well thought-out radiator

guards integrated in the front part of the spoilers provide protection

in case of crashes. Which is also pretty cool.      


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 MY2017 EXC models, which are 6mm

higher than the SX versions.      


KTM engineers sure know how to handle handlebars. This tapered one,

made of high-strength aluminum by NEKEN, is fixed in damped rubber

mountings and has two different positions. From MY2017 onwards, the lower

handlebar clamps are separated, while on the upper side a new bridge-type

clamp guarantees more torsional stiffness. It’s also easier to replace the

bar in case it gets twisted in a nasty crash. An ODI volcanized grip sits on

the right, while on the left side of the bar a comfortable ODI lock-on grip is mounted,

which does not require any wire or glue to be fixed.      



Featuring lightweight, CNC machined hubs and high-end Excel rims, they

guarantee maximum stability and minimal unsprung weight.

The wheels are shod with the latest Dunlop Geomax MX 3S tires.      


The WP monoshock has been developed with the entire frame and swingarm

architecture in mind, including the linkage system and the WP AER 48

front forks. It features machined and black anodized components and

is a valuable, high-end product compared to roughcast reservoirs.

A new setting and a softer spring perfectly match the reworked front-end

set-up and its sparkling WP color scheme lets everyone know you

have excellent taste in suspension.      


You couldn’t brake any harder, better, faster or stronger. These high-tech Brembo

babies are combined with lightweight wave discs made by Galfer. For MY2017,

the rear brake features a 10mm longer brake pedal and you get new,

less aggressive brake pads all round.      


The lightweight WP AER 48 front fork, a 48mm USD air-sprung fork developed

by WP in close collaboration with KTM, is a split fork with separate functions

for each leg. That means damping functions are on the right side, whereas

the air spring is in the left. This left leg features a two-chamber system

with a capsuled air cartridge to prevent loss of air pressure. Should the outer

seal start to leak, the internal cartridge pressure will keep the bike in position.

The air spring is easy to adjust to any rider weight via a single air valve.

No special tools are required; the air pump supplied with the bike will do just fine.

The right fork leg integrates a damping cartridge that tailors to all your damping needs.

It can be adjusted to the track conditions and the rider’s preferences with

a twist of a dial (compression from the top, rebound from the bottom, 30 clicks each).

For MY2017, the AER 48 also features redesigned outer tubes with better bending

characteristics, smoother operation and less friction. Plus: they’ve lost some weight

(265g). Right off the dealer floor, these forks are more comfortable and more sensitive than ever.

But you can still hammer the hell out of them


Top quality, CNC machined triple clamps have been something of a

KTM trademark for years. Ensuring a precise handling, they perceptibly

support the flex characteristics, and with it the action of the forks. For

MY2017, the upper triple clamp specifically features a redesign in conjunction

with the new fork tubes. The rubber damped handlebar fixation has also

been reworked and the lower handlebar clamps are now separated, while

on the upper side a new bridge-type clamp guarantees more torsional

stiffness and can easily be replaced in case it gets twisted due to a crash.

In addition, an hour meter is fitted at the upper triple clamp in order to

let the rider know it’s time for a service. Or a cold drink. 


KTM R&D, Kiska Design and all our factory riders had their say

in shaping the plastics. Their goal: complete harmony between

rider and bike. And so it turned out. Perfect ergonomics and contact points,

maximum freedom of movement, a low seat height and sweet comfort,

especially in the rear part of the seat. The I-beam structures of the front

and rear fenders are prime examples of such an intelligent design, guaranteeing

maximum stability and a low weight thanks to well thought-out construction

and mounting. Plus: they stay cleaner for longer.      


A new, tailor-made kit, fit for a king. Because in this sport, champs deserve to look

the part regardless of the dirt.      



Design 1-cylinder 2-stroke engine
Displacement 249 cm³
Bore 66.4 mm
Stroke 72 mm
Starting aid Kickstarter
Transmission 5-speed
Primary drive 26:73
Secondary gear ratio 14:50
Clutch Wet, DDS multi-disc clutch, Brembo hydraulics
EMS Kokusan                                                                                            


Frame Chrome-molybdenum steel central-tube frame
Front suspension WP-USD, AER 48, Ø 48 mm
Rear suspension WP shock absorber with linkage
Suspension travel Front 310 mm
Suspension travel Rear 300 mm
Brake system Disc brakes
Brake discs - diameter Front 260 mm
Brake discs - diameter Rear 220 mm
Chain 5/8 x 1/4"
Steering head angle 63.9 °
Wheel base 1485 ± 10 mm
Ground clearance (unloaded) 375 mm
Seat height (unloaded) 960 mm
Total fuel tank capacity approx. 7 l
Unleaded premium fuel (95 octane), mixed with 2-stroke engine oil (1:60)
Weight without fuel approx. 95.4 kg


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