For 8 years, the KTM 250 SX-F has been a safe bet in the MX2 world championship. And the new generation features a brand new, even lighter engine and improved fuel injection system. In short, a real concentrate of performance, which will redefine the MX2 class. With a new frame and a new fairing, the new KTM 250 SX-F 2013 is a motorcycle built for victory that will dominate the MX2 class..
A completely new architecture, without a kick starter, with a new die-cast crankcase. Why all this? To reduce weight. In addition, a new elastic and highly resistant aluminum alloy protects the engine of the KTM 250 SX-F 2013 against damage.
Cylinder head and pistons
The bore-to-stroke ratio of the 2013 KTM 250 SX-F reduced stroke slightly to increase peak power. The new cylinder now features a 78mm bore (previously 76mm) to accommodate larger valves. The forged piston (cabinet concept) is lighter despite a larger diameter. This reduces moving masses and achieves high rpm and more power..
The aim was to reduce vibrations despite a higher rpm. This is why the new KTM 250 SX-F engine also has a lateral balance shaft which also serves as a drive gear for the timing chain and for the water pump..
The Keihin Engine Management System with electronic fuel injection has been significantly improved on the 2013 KTM 250 SX-F. Air supply optimized by a new throttle body with 44 mm passage instead of 42 mm and the new injectors further boost performance. The throttle position sensor (TPS) is more resistant against damage and is equipped with a plastic protection against stone throwing. The connectors are now protected against steam by means of rubber eyelets. The cable harness has been simplified and the quality of cables and connectors optimized. In addition, an optional Map-Select-Switch enables various additional engine characteristics to be activated with the push of a button on the handlebars..
Read on if you want to know what a champion transmission is. The heart of the new DOHC engine is the new cylinder head with dual overhead camshafts and DLC coated rocker arms that actuate titanium valves. Channels that optimize flow and enlarged intake valves (32.5mm intake, 26.5mm exhaust) deliver 10% more gas flow and significantly improved performance. The camshafts of the 250 SX-F 2013 have also been overhauled (new timing diagrams, more stroke), to significantly increase power in high revs (max. 14,000 rpm instead of 13,400 rpm). min) compared to the previous model.
Very modern, the frame design made of lightweight, high-strength chrome-molybdenum profile tubes guarantees the perfect blend of longitudinal stiffness and torsional stiffness. This not only provides good handling and precise steering, but also excellent driving stability. The four-stroke frames shine on the 2013 models by stiffening the frame triangle and thinner-walled tubes. This improves stability (increased resistance to torsion) while reducing weight. The optimization also focused on the engine mountings to the cylinder head as well as their connection to the frame. The frames of the KTM 250 SX-F feature a new color and remain a benchmark in terms of weight and stability.
Further upgraded, the 48mm closed-cartridge inverted fork benefits from fully optimized tuning and a new oil specification for perfect alignment with new frames and engines. This new oil is much more resistant to wear and guarantees more constant damping both over the duration of the stroke and over the life cycle. The new lower triple clamp is 80g lighter, and like the upper triple clamp, it has been CNC-milled from high-quality aluminum to significantly improve the damping and response characteristics of the fork..
The WP Monoshock shock absorber has been further improved and now stands out, together with the KTM steering system, with a completely redesigned tuning for optimized damping, improved grip and even more reserves against shocks. Of course, the rebound / compression damping (High and Low speed) can be adjusted in no time to suit the rider and the track..
At the wheels, lightweight CNC machined hubs as well as premium EXCEL rims and new black coated spokes with lightweight aluminum nipples ensure minimal weight for maximum stability. Pirelli Scorpion tires (MX Mid Soft 32) are synonymous with griptraction and guaranteed performance. The KTM 250 SX-F benefits from a reinforced axle from 20 mm to 25 mm for the rear wheel for more stability.
The completely redesigned fairing is a clear signal, and not just from an aesthetic point of view, that the 2013 vintage represents a whole new generation of SX. In particular the ergonomics and functionality of the new plastics are designed so that the entire chassis and engine form a whole in every detail, in perfect harmony with the rider. Tank and deflectors have been given a makeover as have the covers of the air box and the front fender, plate included. We can for example point out the front fender, which no longer has any ribs on its inner face in order to avoid any accumulation of mud. This innovative structure, combined with improved attachment of the mudguard to the triple tree, results in an increase in lateral torsion resistance of up to 50%..
Info credit: KTM France
Photo credit: KTMimages
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250 SX-F 2012
Model marketed in
The technical aspect
KTM 250 SX-F 2013
- Tank: 7.5 liters
- Wheelbase: 1495 mm
- Dry weight: 102 kg
- Train before
- Secondary chain transmission
- Rear axle
(78 x 52.3 mm)