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141614_KTM 125 SX 90de right MY2017
141614_KTM 125 SX 90de right MY2017
141615_KTM 125 SX right front MY2017 studio
141616_KTM 125 SX right rear MY2017studio


Utsalgspris kr65.900


The whip cracking KTM 125 SX has been buzzing at the front for years. If it is up to us, it stays there for many more seasons to come. A compact build and the lowest weight out there team up for the win with a glorious 2-stroke engine, fitted in a state-of-the-art chassis. Get shredding, youngsters.


The latest 125 SX engine is the most powerful and most competitive engine in its class; a clear statement that 

KTM is keen on keeping 2-stroke technology at the forefront of development. The secret to their success 

is an outstanding power-to-weight ratio, low costs and simplicity. This 125cm3 ripper has been developed with 

the latest KTM engineering know-how and the most advanced technology available. The results: class-leading 

power across the rev range, while being extremely compact and ultra-light at a mere 17.2kg. Our work here is done, 

scorching lap times are yours for the taking.


This compact cylinder with a 54mm bore features acutting-edge power valve unit with a sophisticated mechanism

for the lateral support exhaust ports. Matched to a twin-component cylinder head, it is KTM’s secret to all-round grunt.

The layout of the water jackets in the cylinder and head guarantees efficient heat dissipation when the going gets tough.      


For the latest engine generation the KTM engineers designed lightweight die-cast engine

cases featuring a high crankshaft position located close to the center of gravity, which

results in optimal mass centralization and outstanding rideability. In addition, the engine

body is extremely compact, while still able to house an optional electric starter.


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.


A robust 6-speed transmission was designed specifically for the small 2-stroke engine, its

gear ratios perfectly in sync with the 125’s power band. The latest production technologies

allowed for compact dimensions and minimal weight. 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.


This reliable piece of engineering has been skillfully balanced to guarantee minimal vibration. In its latest form,

it allows an increase of the displacement to 144cm3 just by replacing cylinder, piston and head. There’s no more need to

change the crankshaft. Two-in-one in no time.      


The engineers meticulously tuned the expansion chamber for maximum torque and

power, so this little screamer is as tough as it is strong.

87.2 kg

The main target for the KTM engineers when developing the SX models was a massive weight reduction compared

to the previous generation. The result: the current SX models are the slimmest, lightest bikes in the competition.      


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. 


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 systemwith 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. 


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 


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 124.8 cm³
Bore 54 mm
Stroke 54.5 mm
Starting aid Kickstarter
Transmission 6-speed
Engine lubrication  
Primary drive 23:73
Secondary ratio 13:50
Clutch wet multi-disc clutch, Brembo hydraulics
EMS Kokusan



Frame 25CrMo4 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 Front Disc brake
Brake system Rear Disc brake
Brake discs - diameter front 260 mm
Brake discs - diameter rear 220 mm
Chain 5/8 x 1/4"
Steering head angle 63.9 °
Wheelbase 1485 ± 10 mm
Ground clearance, unloaded 375 mm
Seat height, unloaded 960 mm
Fuel tank capacity, approx. 7 l
Unleaded premium fuel (98 octane), mixed with 2-stroke engine oil (1:40)
Weight without fuel, approx. 87.2 kg
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