The 50 SX is a true READY TO RACE KTM for young MX riders. It is a genuine dirt bike that, like its bigger siblings, is produced with top-quality components. This makes the 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 allows the rider to concentrate on the track, not shifting. This year’s model features revolutionary WP AER 35 front forks, fully adjustable rear suspension, a new exhaust, ultra-cool graphics and a lot of detail improvements that make going fast fun.

Specifications

Engine
Bore x Stroke	39.5 mm x 40 mm
Displacement	49 cm³
Emission	Seletra 2p D36
Engine	1-cylinder, 2-stroke engine
Fuel Capacity	2.3 l
Starter	Kickstarter
Transmission	Single-speed automatic

Chassis
Brake Front	Disc brake 160 mm
Brake Rear	Disc brake 160 mm
Chain	1/2 x 3/16″
Frame	Central-tube frame with double-cradle
Steering head angle	66°
Suspension Front	WP-USD, AER 35, Ø 35 mm
Suspension Rear	WP shock absorber
Suspension Travel	front: 205 mm / rear: 185 mm

Dimensions
Ground Clearance	252 mm
Seat Height	684 mm
Weight	41.5 kg without fuel
Wheelbase	1032 ± 10 mm

Transmission
Ratios	(Secondary) 11:40

General Information
Clutch	Centrifugal clutch (adjustable)
Primary Drive	61:33

Features

All

• Bodywork – The bodywork is derived from the full-size SX models and provides perfect ergonomics with 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.
• Brakes – 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.
• Clutch – 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.
• Cylinder – The high performance cylinder features a pressure controlled exhaust valve (PCEV) and provides an unrivaled performance within the highly competitive 50 cc class.
• Engine – The modern, extremely compact 2-stroke engine fitted with an automatic clutch sets the standard in its class with improved power due to a new exhaust 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.
• Exhaust – A newly developed exhaust pipe provides a higher output and a smoother power delivery over the entire rev range, making the new 50 SX even more competitive than before.
• Frame – 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.
• Front Suspension – The new 50 SX is the first model in its class fitted with a modern, fully adjustable air fork: the AER 35, made by WP Suspension. Beside a massive weight reduction of 1.6 pounds, the newly developed upside-down front forks with 35mm tube diameter and 205mm of travel ensure 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 and simply to the rider’s weight just with an air fork pump.
• Graphics – 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 black.
• Handlebars – Made of high quality aluminum alloy, the handlebars offer top stability and safety. A crash pad on the handlebar brace protects from unintended contact.
• Power Reduction Kit – For absolute beginners the engine power can be reduced to a moderate 5.5hp using a kit from the PowerParts catalog.
• Radiator – 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.
• Rear Suspension – On the rear wheel a WP monoshock linked directly to the swingarm provides excellent damping performance and is now fully adjustable in order set the damping perfectly to rider’s preferences and track conditions. The rear wheel travel is 185mm.
• Swingarm – The 50 SX is fitted with a lightweight cast aluminum swingarm. Conceived using the latest in calculation and simulation software, the design and wall thickness have been made for minimum weight at optimum stiffness and precisely defined flexibility. In addition it features a robust 2-compound chain guide similar to the full-size models.
• Wheels – 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.