The 2013 KTM 350 SX-F comes with a set of improvements for 2013 which include an upgraded engine, an improved chassis and a fresh look.
The motorcycle is built on a light, high strength, frame made of chrome-molybdenum steel section tubes which offer a perfect combination between longitudinal and torsional stiffness. It’s also worthy of being mentioned that the frame bears a new color on the KTM 350 SX‑F 2013.
The motorcycle rides on an improved 48 mm upside-down fork which has been optimised with completely revamped settings. Out back there is a new cast aluminum swingarm developed to offer minimum weight with optimum stiffness and sufficient flex. For the KTM 350 SX‑F 2013, engineers have redesigned the rear section of the swingarm to allow installation of a thicker rear wheel axle (25 mm instead of 20 mm).
Hit the jump for more information on the 2013 KTM 350 SX‑F.
For 2 years now, the KTM 350 SX‑F has been demonstrating that races are not decided by displacement. This unique bike supplies the power and performance of a 450 combined with the handling of a 250. Now the serial winner is entering MY 2013 with a revamped engine, an improved chassis and new bodywork.
The modern frame design of lightweight, high strength, chrome-molybdenum steel section tubes guarantees an ideal mix of longitudinal and torsional stiffness, resulting not only in easy handling and precise steering behaviour, but also in excellent ride stability. The four-stroke frames impress in MY 2013 with a stiffening of the frame triangle and thinner-walled down tubes. This leads to an improvement in tracking stability (increased torsional stiffness) accompanied by a reduction in weight. The engine braces to the cylinder head have also been optimised, along with their attachment to the frame. The frame bears a new colour on the KTM 350 SX‑F 2013 and it is still the benchmark in terms of weight and stability.
The further improved 48 mm upside-down fork featuring closed-cartridge technology has been optimised with completely revamped settings for perfect harmony with the new frame and engine. The new oil is significantly more wear-resistant and guarantees more consistent damping throughout both the course of a race and the bike’s life cycle. A new lower triple clamp is 80 g lighter and, just like the upper triple clamp, CNC-machined from high quality aluminium, whereby the steering characteristics and hence the responsiveness of the fork have been noticeably improved.
The cast aluminium swingarm has been developed with state-of-the-art calculation and simulation software and constructed, in terms of design and wall thickness, for minimum weight with optimum stiffness and sufficient flex. For the KTM 350 SX‑F 2013, engineers have redesigned the rear section of the swingarm to allow installation of a thicker rear wheel axle (25 mm instead of 20 mm) for the benefit of better tracking stability. Moreover, they have succeeded in reducing weight by more than 100 g by revising the bolts, cups and nuts on the linkage.
The wheels are fitted with lightweight, CNC-machined hubs and high-end EXCEL rims, plus new, black-coated spokes with aluminium nipples, guaranteeing the highest levels of stability while keeping weight to a minimum. The Pirelli Scorpion tyres (MX Mid Soft 32) stand for excellent traction and good performance. For the benefit of greater ride stability on the KTM 350 SX‑F 2013, the rear axle has been increased in diameter from 20 mm to 25 mm.
Brakes from Brembo are standard equipment on KTM motocross bikes and, together with lightweight wave brake discs, they are recognised as the measure of all things in terms of application and brake performance. At the rear wheel, the brake calliper carriers have been adapted to the larger axle diameter for MY 2013.
The advantage of the KTM 350 SX‑F has always been its weight. And now the bike’s heart is even lighter. Another 500 g and more have been lost thanks to the new die-cast housing. The extremely short-stroked DOHC power unit, equipped with the latest generation of EFI, excels with its even wider rev range and exceedingly efficient rideability. And, just like all KTM four-strokes, it can be activated with an electric starter.
The modifications to the 350 cm³ DOHC engine can be summarised very easily: more power at less weight. Flow-optimised ducts supply greater gas flow and therefore better cylinder charging. Strengthened valve heads and valve seats plus valve springs with a higher spring force make it possible for the lightweight titanium valves to withstand the increase in maximum engine speed from 13,000 1/min to 13,400 1/min. Or more simply said: more power for the new KTM 350 SX‑F 2013.
Factory bike or production bike? You’ll find no difference in the crankshaft. Just like last season’s KTM factory machines, the crankshaft on the new KTM 350 SX‑F 2013 is equipped with a revolutionary plain bearing in the lower conrod eye. In conjunction with the stiffened crankshaft and a lighter piston, this design is a key prerequisite for increasing the maximum engine speed to 13,400 1/min and the impressive peak performance of the 350 cm³ engine. But not everything revolves around pure power. One major benefit is an extension to the service intervals for the crankshaft; a benefit in terms of time and costs.