250 SX-F - THE NEW BENCHMARK
As demonstrated by five consecutive world championship titles between 2008 an 2012, the 250 cc fourstroke offers KTM riders the best balance of performance and handling in the MX2. For 2013, a completely new and significantly stronger engine with a shorter stroke and a larger bore will lift the 250 SX-F to an even higher level. The design of the new DOHC cylinder head has larger ports, an optimised combustion chamber, larger intake valves and new camshafts. The newly designed cylinder houses an extremely lightweight piston. The new crankshaft carries less inertia and has a connecting rod with plain bearings. The engine cases are produced in high pressure die cast instead of sand cast. The engine is now fitted with a counter balancer shaft for reduced vibrations and with a new clutch. As all MY 2013 fourstroke engines the 250 SX-F is equipped with a new Keihin engine management system and fuel injection which allows for higher gas flow and improved spray. Moreover the 250 SX-F is benefitting from a significantly revamped chassis. The new suspension scores with even higher reserves against bottoming out, improved responsiveness, and even better tracking stability. The 250 SX-F for 2013 is once again programmed for victory to win the MX2 World Championship title again.

350 SX-F - A CLASS OF ITS OWN
Nearly the power of a 450, combined with the agility of a 250 – by winning the MX1 World Championship 2012, Antonio “Tony” Cairoli has now proven the potential of the 350 SX-F for the third year running. In order to keep the advantage over 450 cc MX1 contenders, KTM improved the performance of the 350 SX-F once again. For 2013 new ports in the DOHC cylinder head provide better gas flow, stronger intake valve springs and a lighter piston allow higher rpm. The crank shaft is stiffer and lighter than before and wears a pressure lubricated plain bearing for the connecting rod. The engine cases are produced in high pressure die cast instead of sand cast which allows a massive weight reduction by thinner walls. As all MY 2013 four-stroke engines the 350 SX-F is equipped with a new Keihin engine management system and fuel injection which allows for higher gas flow and improved spray. Moreover the 350 SX-F is benefitting from a significantly revamped chassis with new triple clamp, reworked frame and swingarms, stronger rear wheel axle, and modified settings. The new suspension scores with even higher reserves against bottoming out, improved responsiveness, and even better tracking stability.

450 SX-F - SHEER POWER UNDER FULL CONTROL
If raw power is called for, nothing can replace displacement, as amply demonstrated by Ryan Dungey winning the AMA Motocross Championship 2012. The newly developed OHC four valve engine for 2013 has a major advantage in terms of weight and power. The design of its new cylinder head is based on the 450 EXC engine but features newly developed ports, combustion chamber and valve train. The piston is lighter now and the connecting rod features a pressure lubricated plain bearing. The engine cases are produced in high pressure die cast instead of sand cast which allows a massive weight reduction and a more compact engine. As all MY 2013 four-stroke engines the 450 SX-F is equipped with a new Keihin engine management system and fuel injection. Moreover the 450 SX-F is benefitting from a significantly revamped chassis with new triple clamp, reworked frame and swingarms, stronger rear wheel axle, and modified settings. The new suspension scores with even higher reserves against bottoming out, improved responsiveness, and even better tracking stability. It never was easier to master the sheer power of the 450SX-F.