KTM 125 XC-W 2018:MINIMAL FUSS, MAXIMUM FUN
‘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.
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.
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 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).
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.
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.
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|
|Clutch||wet multi-disc clutch, Brembo hydraulics|
|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|