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The KTM 50 SX is a true KTM for young MX riders aged from around 4 to 10 years old and up to a body height of 1.30m. It is a genuine dirt bike that, like its bigger siblings, is produced with top-quality components. This makes the KTM 50 SX the first choice as a stepping stone into the world of MX or for the first racing step on the ladder. With the youngster in mind this package has an engine that delivers steady, controllable power, incorporating an automatic clutch that is ideal for novice riders. This model features revolutionary WP AER 35 front fork, fully adjustable rear suspension, ultra cool graphics and the ability to make going fast, fun. And safe.



The modern, extremely compact 2-stroke engine

fitted with an automatic clutch sets the standard

in its class with improved power and power band

due to a new pipe. Thanks to the 3-shaft design,

the crankshaft is close to the bike’s center of gravity.

This does not just benefit the handling, but also

allows for a flow optimized intake angle into the

reed valve – a prerequisite for maximum performance.



For absolute beginners the engine power can be

reduced to a moderate 5.5hp using a kit

from the PowerParts program.



The exhaust system provides a high output and

a smooth power delivery over the entire rev range.



The high performance cylinder sets in conjunction

with the pipe and reed intake system the performance

standard within the highly competitive 50cc class.




Developed by KTM, the centrifugal multi-disc automatic

clutch provides manageable acceleration and makes riding

this motorcycle the easiest thing in the world. It can be

adjusted to the specific requirements of the track and

the rider in minutes and without any special tools.



The bodywork is derived from the full-size SX

models and provides perfect ergonomics,

well thought-out contact points for the rider and

maximum freedom of movement. In addition, smart

design solutions for the new front and rear fenders

are prime examples of an intelligent design, which

guarantees maximum stability through a well

thought-out structure and mounting.  



The modern frame produced by WP Performance Systems

is made of lightweight, high strength chromoly steel

profiles and combines maximum longitudinal stiffness with

optimum torsional rigidity. It guarantees easy handling

and precise cornering, but also outstanding stability.




Derived from the full-size SX bikes, the graphic design

makes the new 50 SX look even cooler. Its frame has a

super rugged polymer coating in cheeky black.



Like the big KTM bikes, the 50 SX has a liquid cooling

system, which even cools the crankcase. Generously

sized radiators ensure outstanding heat dissipation

for high reliability, even under extremely heavy duty.     



Made of high quality aluminum alloy, the handlebar

offers top stability and safety. A slide pad on the

handlebar brace protects our dearest from

rough contact.      



The KTM 50 SX has a modern, fully adjustable air

fork: the WP AER 35, made by WP Suspension.

This upside-down front fork with 35mm tube diameter

and 205mm of travel ensures outstanding comfort,

damping characteristics and directional stability.

Another main benefit for junior riders is

that the air spring fitted in the left fork leg can

be adjusted perfectly to the rider’s weight just

with a simple air fork pump.



On the rear wheel a WP shock absorber linked directly to

the swingarm provides excellent damping performance

and is fully adjustable in order set the damping perfectly

to rider’s preferences and track conditions. The rear

wheel travel is 185mm.



Like the big KTM factory racers, the 50 SX has super

lightweight, black anodized, aluminum rims providing

highest strength and safety. The OEM knobbly MAXXIS

tires grip superbly on any surface.


The 50 SX is fitted with front and rear hydraulic brakes

by Formula combined with lightweight wave discs

that are easy to control even for the youngest riders.

This ensures the best deceleration and the highest

standard when it comes to safety.






Design 1-cylinder, 2-stroke engine
Displacement 49 cm³
Bore 39.5 mm
Stroke 40 mm
Starting Kickstarter
Transmission Single-speed automatic
Primary drive 61:33

Secondary gear ratio

Clutch Centrifugal clutch (adjustable)
EMS Seletra 2p D36



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