2014 KTM 250 SX

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Weighting just 96.3 kg, and powered by a 1-cylinder, 2-stroke, water-cooled engine the 2014 KTM 250 SX offers the best power to weight ratio in its class. The engine is housed by a lightweight chassis that further enhances the motorcycle’s performances.

Compared to the previous generations, the 2014 250 SX’s engine has been improved with a redesigned reed valve housing featuring Boyesen high-performance reeds. You also get a revised carburetor setting.

Other upgrades made to the 2014 model year include, an improved seat, a new fuel tank and new classy graphics.

The suspension is kept in check by a rear monoshock and a 48mm upside-down front fork signed by WP Suspension. For enhanced versatility, compression and rebound damping can be adjusted to the track conditions. For 2014, the engineers have also revised the chain guide to increase reliability while lowering the weight.

Hit the jump for more information on the KTM 250 SX.


KTM 250 SX

Power up

The 250 SX is considered to be the motocross bike with the best power-to-weight ratio. The lightweight 2-stroke engine scores with unrivaled performance, wrapped into an extremely lightweight chassis - a serious competitor for the more complex 4-stroke contenders.

2014 KTM 250 SX Key Features:

KTM 250 SX

Unrivaled handling:


The wheels use lighweight, CNC-machined hubs, high-end Excel rims and spokes coated in black with lightweight aluminum nipples to achieve maximum stability at minimum weight. The OEM Dunlop Geomax MX51 tires deliver perfect traction and outstanding performance.


High-Tech Brembo brakes have always been standard equipment on KTM offroad bikes. Combined with the lightweight Wave discs, they are the ultimate solution in braking technology. The SX models gain a newly-developed master cylinder with a new reservoir, a smaller piston diameter and optimized lever kinematics. Combined with optimized brake pads, this makes for another perceptible improvement of front brake performance and action.

Top performance:

KTM 250 SX


A new DDS clutch (Damped Diaphragm Steel) with a wear-free steel cage is fitted to the new KTM 250 SX engine, allowing use of thin steel discs for minimum overall width. The diaphragm spring, which preloads the package, not only reduces the operating force required to pull the clutch, but also provides space for integrated hub damping. The result: more traction and protection for the transmission. And with updated hydraulic clutch actuation from Brembo, the rider has everything under control right from the start.


In 2014, the 250 SX engine has been improved with a redesigned reed valve housing featuring Boyesen high-performance reeds for better responsiveness. A revised carburetor setting and ignition curve also allow for increased performance.

Cylinder head:

The 250 SX has a new cylinder head with optimized combustion chamber. The benefit is more efficient combustion for better response and increased torque over the entire load and engine speed range. A new CDI box with optimized ignition mapping has been fitted for more effective combustion for better power delivery and optimum rideability.

Top ergonomics:

KTM 250 SX

Air box:

The airbox design offers maximum protection of the air filter against soiling while ensuring maximum airflow for top performance. The Twin Air filter can be changed without tools in seconds, a standard for KTM.


Ergonomically perfect, the seat has received an improved foam core, ensuring greater comfort and durability.


In shaping the bodywork, the KTM designers’ ergonomic and design focus was to achieve complete harmony between rider and bike, down to the finest details. The front fender is a prime example of a moulded polymer component gaining maximum stability through a well thought-out structure and mounting.

Fuel tank:

All models of the SX range have a new, lightweight polythene tank with a capacity of 1.98 gallons. The new filler cap with the inside thread makes for an easier and reliable closure.


New classy graphics with clear lines visually underscore the exacting standards of what KTM deems a true, cutting-edge motocross bike.


All SX models are fitted with the super strong, tapered Renthal Fatbar 827 whose bend is especially well suited for the requirements of motocross. The proven standard KTM mount allows to fix the handlebar in four different positions. A large Renthal crash pad in a classy combination of black and silver, offers effective crash protection for the rider.

Superiror chassis:

KTM 250 SX

Triple clamps:

Top-quality, CNC-machined triple clamps have been something of a KTM trademark. Ensuring a precise handling, they perceptibly support the flex characteristics, and with it, the fork’s action.


Designed using the latest in calculation and simulation software, the design and wall thickness of the cast aluminum swingarm have been optimized for minimum weight at optimum stiffness and precisely defined flexibility provides perfect stability at minimum weight. For 2014, the engineers have revised the chain guide to increase reliability while lowering the weight.


The rear monoshock as well as the 48mm upside-down front fork by WP Suspension guarantee the best response and damping characteristics. In 2014, the fork has more reserves against bottoming out thanks to their optimized setting. Of course, compression and rebound damping can be adjusted to the track conditions and the rider’s preferences with a twist of the wrist - the rear monoshock even has separate high and low speed adjustments.


The state-of-the-art frame design made of lightweight, high-strength chromoly steel sections combines maximum longitudinal stiffness with optimum torsional rigidity. It guarantees easy handling and precise cornering, but also outstanding stability.


KTM 250 SX
Engine type1-cylinder 2-stroke engine, water-cooled, with reed intake and exhaust control
Displacement249 cm³ (15.19 cu in)
Bore66.4 mm (2.614 in)
Stroke72 mm (2.83 in)
Starting aidKick starter
Gearbox5-gear, claw shifted
Primary transmission26:72
Secondary ratio13:48
ClutchMultidisc clutch in oil bath/hydraulically activated
IgnitionContactless controlled fully electronic ignition with digital ignition adjustment, type Kokusan
FrameCentral tube frame made of chrome molybdenum steel tubing
ForkWP Suspension Up Side Down 4860 MXMA CC
Shock absorberWP Suspension 5018 BAVP DCC
Suspension travel Front300 mm (11.81 in)
Suspension travel Rear317 mm (12.48 in)
Brake systemDisc brakes, brake calipers on floating bearings
Brake discs - diameter Front260 mm (10.24 in)
Brake discs - diameter Rear220 mm (8.66 in)
Chain5/8 x 1/4"
Steering head angle63.5°
Wheelbase1,495±10 mm (58.86±0.39 in)
Ground clearance unloaded385 mm (15.16 in)
Seat height unloaded992 mm (39.06 in)
Total fuel tank capacity, approx.7.5 l (1.98 US gal) Super unleaded gasoline (95 octane), mixed with 2-stroke engine oil (1:60)
Weight without fuel, approx.96.3 kg (212.3 lb.)

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