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‘XC’ means cross country. ‘W’ represents its wide-ratio transmission. ‘KTM’ stands for winning. This model is a race-ready bike built for closed course Enduro rides or races that don’t require an homologated motorcycle. And for riders who don’t want to drag around the extra weight that comes with homologation requirements. The KTM 125 XC-W simply is the lightest Enduro bike money can buy, while still being a heavyweight in terms of power. When the going gets tough, the tough get an XC-W.


The KTM 125 XC-W engine is the most powerful and most

competitive engine in its class, providing precisely the kind

of power an Enduro rider wants. This 125cc ripper has been

developed with the latest KTM engineering know-how and the

most advanced technology available. The results: whopping

power and mountain conquering torque across the entire

rev range, while being extremely compact and light.


Cylinder and cylinder head

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. A 150cc cylinder, head and piston unit can

now also be fitted to this engine base, converting

it to a 150 without replacing the crankshaft. And to top

this power pack off, lightweight, lateral brackets allow

an efficient fixation of the engine to the frame.

What’s not to like?


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.



The KTM 125 XC-W 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° to reduce the overflow

of fuel. And it’s less sensitive to different altitudes and

temperatures, so you can pin it wherever, whenever.



The clutch is activated by a hydraulic system made by Brembo.

This reliable and self-adjusting unit guarantees light operation

and highly controllable modulation.


Exhaust system

The engineers meticulously tuned the pipe for maximum power,

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



A wide-ratio 6-speed Enduro transmission was designed

specifically for the small 2-stroke Enduro 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 shift lever

design prevents muck from blocking the joint. Because even

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



The design of the new 125cc engine allows the option to

the customer to fit an E-starter. A KTM PowerParts kit includes

all the hardware needed to convert the bike. Even though

the overall weight rises slightly, there are clear benefits having

the magic button, especially for the ones looking to compete

on an extreme level.



This little gem is optimized for maximal reliability and its

shape fits brilliantly to the state-of-the-art cylinder layout.



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 shedding weight. The result: the

current KTM XC-W’s are the slimmest, lightest bikes in

the Enduro scene.



This design allows for an optimized mounting position of the PDS

shock absorber, providing more progressive action. Furthermore,

the cast aluminum design guarantees low weight and a perfect

flex behavior. The single-component casting process also

eliminates any inconsistencies and inherent weak points

created by welding. And it’s better looking.



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 a reduced vibration level. Two threaded inserts in the

lower cradle tubes allow for safe fixation of an optional skid plate.

The engineers could 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 smudging up the pegs,

even when digging in deep ruts. The pegs on the Enduro

models are 6mm higher than the ones used on SX versions, which

benefits ground clearance. But you can swap them at will.


Rear suspension

The PDS is kind of a KTM trademark where the shock absorber

is directly connected to the upper side of the swingarm. This

setup boasts the best possible mounting geometry and

provides amazingly progressive damping. The shock absorber

is mounted close to the centerline, which means nearly symmetrical

loads for the swingarm and frame and more space for the

exhaust system. A second piston works together with a closed

cup (instead of a needle) towards the end of the stroke and is

supported by a progressive shock spring for exceptional bottoming

resistance. Various machined and anodized components

and a distinctive WP color trim make this a valuable, high-end

product compared to the less refined shock absorbers of

the competition.


Front suspension

The WP Xplor 48 upside-down fork is a split fork developed

by WP in close collaboration with KTM. It is fitted with a

spring on both sides but features separated functions for

each fork leg: compression damping is fitted on the left

side, while rebound is on the right. The forks can easily

be adjusted for compression and rebound with the twist

of a dial on the top of the forks. New outer fork tubes and

a reworked setting make for more sensitivity, improved damping

behavior and a reduced weight. In addition, a sealed hydro-stop

guarantees excellent resistance to bottoming-out. Due

to high-quality materials and a state-of-the-art production

process, the new WP Xplor 48 fork – with approx. 300mm of

travel – has outstanding response and damping characteristics.

A comfortable preload adjuster can be retrofitted and allows

for a simple spring preload setting in three steps without

tools (standard, +3mm, +6mm).


Triple clamp

The XC-Ws are fitted with forged triple clamps with an offset

of 22mm, ensuring a solid grip of the fork and precise handling.

The handlebar is adjustable forwards and backwards over

4 positions, so the XC-W will fit you like your favorite gloves.



You can’t brake any harder, better, faster or stronger. High-tech

Brembo calipers are combined with lightweight Wave brake discs.

The steel-flex front brake hose has efficient protection and

there’s an integrated channel for the speedometer cable.

First you outrun them, then you outbrake them.



KTM engineers know how to handle handlebars. This tapered unit,

made of high-strength aluminum by NEKEN, features a throttle

assembly with a robust aluminum body and easy free-play

adjustment. An ODI volcanized grip sits on the right, while on

the left side of the bar a comfortable ODI lock-on grip

requires no glue or wire to secure it.


Air filter box

The air filter box design offers maximum protection of the air filter

against soiling, while ensuring maximum airflow in a quiet way.

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.


Fuel tank

A lightweight polyethylene tank with a capacity of 10 liters. You

will always be able to see how much fuel there’s left

at a glance, thanks to the see-through plastic. By pushing the

orange release button in the center of the fuel tank cap,

the bayonet mechanism makes refueling quick and easy.



The KTM 125 XC-W wheels feature lightweight, CNC machined hubs

and high-end Giant rims guaranteeing maximum stability at

minimum weight. The wheels are fitted with the latest MAXXIS

tires. Take them wherever you like, traction will be waiting.


Cooling system

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.



KTM R&D, KISKA Design and the factory racers 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 XC-W. 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. Clever brake hose routing on the front

number plate prevents wear and tear.



New graphics convey the READY TO RACE character

of the 2018 KTM XC-W model line.









Design 1-cylinder, 2-stroke engine
Displacement 124.8 cm³
Bore 54 mm
Stroke 54.5 mm
Starting aid Kickstarter
Transmission 6 speed
Primary ratio 23:73
Secondary ratio 13:50
Clutch wet multi-disc clutch, Brembo hydraulics
EMS Kokusan


Frame Design 25CrMo4 steel central-tube frame
Suspension travel (front) 300 mm
Suspension travel (rear) 310 mm
Brake system Disc brakes
Brake discs - diameter Front 260 mm
Brake discs - diameter Rear 220 mm
Chain X-Ring 5/8 x 1/4"
Steering head angle 63.5 °
Wheel base 1471 ± 10 mm
Ground clearance (unloaded) 370 mm
Seat height 960 mm
Total fuel tank capacity approx. 9.5 l
Weight without fuel approx. 100 kg
Weight READY TO RACE (without fuel) 91 kg
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