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The whip cracking KTM 125 SX has been at the front for years. With phenomenal performance on tap, it will be there for many more seasons to come. A compact chassis and the lowest weight out there is teamed up with a high performance 125cc 2-stroke engine for a surefire trophy collection. Get shredding, youngsters.



The latest KTM 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 125cc 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;

now it’s up to you to collect the trophies.





This compact cylinder with a 54mm bore features a

cutting-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.




The KTM engineers designed lightweight die-cast

crankcases featuring a high crankshaft position located

close to the center of gravity, which results in optimal

mass centralization and outstanding rideability.






The KTM 125 SX is fitted with a MIKUNI TMX carburetor.

This 38mm flat slide carb lives to provide smooth and controllable

power all the way up to the rev limitation. With a new intake

manifold the carburetor is turned 7° in order to reduce the

overflow of fuel.  And it’s less sensitive to different

altitudes and temperatures, so you can pin it

wherever, whenever.




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 144cc

just by replacing cylinder, piston and head. There’s no

more need to change the crankshaft. Two-in-one in no time





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. A reworked 3rd, 4th

and 5th gear further improve reliability. The latest

production technologies allowed for compact dimensions

and minimal weight. Keeping safety in mind,

an advanced ´No Dirt´ gear shift lever design prevents

dirt from blocking the joint.





The engineers meticulously tuned the resonator

chamber for maximum torque and power, so this

little screamer is as tough as it is strong.



All 2-stroke models feature a new CDI control unit with an

advanced hardware which improves the starting behavior

of the engine. The ignition curves remain unchanged.



KTM engineers just love dropping weight year after year.

The result: the 2018 KTM SX models are the

slimmest, lightest dirt bikes out there.



The air filter box 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 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, engine head stays (the connection between

cylinder head and frame) are now made of lightweight

aluminum. They contribute to more 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.




Sophisticated ´No Dirt´ footpegs prevent clogging

of the footpeg pivot, even when digging in deep ruts.

Looking for a higher riding position? Then just mount

the footpegs of the MY18 KTM EXC models, which are

6mm higher than the SX versions.



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.



KTM engineers sure know how to handle handlebars.

This tapered one, made of high-strength aluminum,

is fixed in damped rubber mounts and has two different

positions.. ODI lock-on grips make grip changes easy

and do not require any wire or glue to be secured.



KTM’s proven cooling system routes the coolant from

the cylinder head through the frame triangle, directly

to aluminum radiators made by WP. Thanks to flow

optimized internal circulation and CFD-calculated ventilation,

the system is superbly efficient. In addition, new radiator

protections improve heat dissipation. Especially in the mud.

They are also integrated into the front part of the

shrouds to protect the radiators in a crash.





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.






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 R&D, KISKA Design and all our factory riders

had their say in shaping the plastics with one goal:

complete harmony between rider and bike. Perfect ergonomics

and contact points provide maximum comfort in

movement on the SX. The I-beam structures of the

front and rear fenders guarantee maximum stability

and a low weight thanks to well thought-out construction

and mounting. They also stay cleaner for longer.



A new, tailor-made kit and a Factory orange frame.

Because in this sport, champs deserve to

look the part regardless of the dirt.


Shock absorber

The WP shock absorber has been developed with the

entire frame and swingarm architecture in mind, including

the linkage and the WP AER 48 front fork. It features

machined and black anodized components and is

a valuable, high-end product compared to roughcast

reservoirs. A new, confidence inspiring setting with

improved damping characteristics perfectly matches the

front-end setup 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 2-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 fork 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). Right

off the dealer floor, this fork (with reworked damping characteristics)

is more comfortable and more sensitive than ever. But

you can still hammer the hell out of it.


Top quality, CNC machined triple clamps have been a

KTM trademark for years to ensure precise handling.

The rubber damped handlebar fixation allows for

two positions and an hourmeter is fitted in order

to let the rider know it’s time for a service.



These high-tech Brembo babies are combined with

lightweight Wave brake discs. You couldn’t

brake any harder, better, faster or stronger.











Design 1-cylinder, 2-stroke engine
Displacement 124.8 cm³
Bore 54 mm
Stroke 54.5 mm
Starting Kickstarter
Transmission 6-speed
Primary drive 23:73

Secondary gear ratio

Clutch wet multi-disc clutch, Brembo hydraulics
EMS Kokusan




Frame design

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

Front brake

Disc brake

Rear brake

Disc brake

Front brake disc diameter

260 mm

Rear brake disc diameter

220 mm


5/8 x 1/4"


Steering head angle

63.9 °


1485 ± 10 mm

Ground clearance

375 mm

Seat height

960 mm

Tank capacity (approx.)

 7 l

Weight READY TO RACE (without fuel)

87.2 kg


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