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Home / Bikes /Enduro / 250 EXC

250 EXC

ktm-250-exc

A 2-stroke of genius

When the smoke clears, you’ll be the last rider standing. The KTM 250 EXC is one of the best pound-for-pound fighters in the world of Enduro, pummeling it’s more complex 4-stroke rivals. All muscle, no fat: this 2-stroke machine is as lean as it is powerful.

Engine

Engine

The engine of the KTM 250 EXC has been known and respected for being the most powerful 2-stroke engine in its class. 2-strokes really do have a future at KTM. Their outstanding power-to-weight ratio, low cost and simplicity see to that. The KTM 250 EXC engine has been optimized for mass centralization, comes with a twin-valve controlled power valve, a balancer 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 snarl when you’re on the pipe.

Cylinder

This compact cylinder with a 66.4mm 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.

Crankcases

Crankcases

These die-cast crankcases allow the implementation of a balancer 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: its engine covers feature a smart surface structure in order to reduce the wear caused by the rider’s boots.

Transmission

Transmission

This 6-speed Enduro transmission features an Enduro-specific wide-ratio specification and provides precise and easy shifting. 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.

Balancer shaft

Balancer shaft

Say goodbye to numb feet and hands. This engine design allows the implementation of a lateral balancer shaft in order to keep the vibrations to a minimum. You know what that means: more comfort, less fatigue, bigger smiles.

Clutch

Clutch

The KTM 250 EXC employs the KTM-developed DDS clutch (damped diaphragm steel) with a wear-free steel basket, extremely heat resistant clutch plates and new, nitrated steel liners. This clever design employs a diaphragm spring instead of the usual coil springs, making for considerably easier clutch action. A diaphragm spring also leaves sufficient space for a damping system to be integrated into the clutch hub. The goal is traction, but durability is as well. Light operation and telepathic amounts of control are standard with this hydraulic Brembo actuated clutch.

Carburetor

The KTM 250 EXC 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. It gets a new setting too, improving power delivery and rideability.

Exhaust system

Exhaust system

The engineers meticulously tuned the pipe for maximum torque and power, so this little screamer is as tough as it is strong.

Ignition

Ignition

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.

Featherweight

KTM engineers just love dropping weight year after year. The result: the 2018 KTM EXC models are the slimmest, lightest dirt bikes out there.

Frame

Frame

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 aluminum 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.

Footpegs

Footpegs

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 models, which benefits ground clearance. But you can swap them at will.

Air filter box

Air filter box

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.

Handlebar

Handlebar

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.

Swingarm

Swingarm

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.

Fuel tank

Fuel tank

A lightweight polyethylene tank with a capacity of 9.5 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.

Wheels

Wheels

The EXC wheels feature lightweight, CNC machined hubs and high-end Giant rims guaranteeing maximum stability at minimum weight. The wheels are fitted with MAXXIS tires – perfect for surefooted performance off-road and stability on-road.

Cooling system

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.

Bodywork

Bodywork

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 EXC. 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.

Graphics

Graphics

A new, tailor-made kit and a Factory orange frame. Because in this sport, champs deserve to look the part regardless of the dirt.

Rear suspension

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

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

Triple clamp

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 EXC will fit you like your favorite gloves.

Brakes

Brakes

These high-tech Brembo babies are combined with lightweight Wave brake discs. You couldn’t brake any harder, better, faster or stronger.

Battery & Wiring harness

Battery & Wiring harness

A strong lithium ion battery breathes life into the engine and contributes to low vehicle weight. The lightweight battery and wiring harness are centralized in a compartment above the air filter box, allowing the mechanic to remove the subframe without getting in conflict with the electronics. A happy mechanic is a good mechanic.

Engine

  • Design

    1-cylinder, 2-stroke engine

  • Displacement

    249 cm³

  • Bore

    66.4 mm

  • Stroke

    72 mm

  • Starter

    Kick and electric starter

  • Transmission

    6-speed

  • Primary drive

    26:73

  • Secondary gear ratio

    14:50

  • Clutch

    wet multi-disc clutch, Brembo hydraulics

  • EMS

    Kokusan

Chassis

  • Frame design

    Chrome-molybdenum steel central-tube frame

  • Rear suspension

    WP Xplor PDS shock absorber

  • Suspension travel (front)

    300 mm

  • Suspension travel (rear)

    310 mm

  • Front brake

    Disc brake

  • Rear brake

    Disc brake

  • Front brake disc diameter

    260 mm

  • Rear brake disc diameter

    220 mm

  • Steering head angle

    63.5 °

  • Wheelbase

    1482 ± 10 mm

  • Ground clearance

    370 mm

  • Seat height

    960 mm

  • Tank capacity (approx.)

    9.5 l

  • Weight READY TO RACE (without fuel)

    100 kg

The illustrated vehicles may vary in selected details from the production models and some illustrations feature optional equipment available at additional cost.
All information concerning the scope of supply, appearance, services, dimensions and weights is non-binding and specified with the proviso that mistakes, printing, setting and typing errors may occur; such information is subject to change without notice.