Motorcycle specifications KTM350 SX-F 2015 Thirst for MX

the 350 SX-F never ceases to amaze! In 2013, it won the MX1 World Championship for the third time running, and dominated the MX of Nations. Toni Cairoli clearly dominates this category aboard his 350 SX-F, and loves this ingenious concept that combines lightness, easy handling and a motor capable of soaring high up the revs. A unique recipe for success, which benefits professionals and amateurs alike.

frame

The modern frame design of SX models in lightweight, high-strength chromium-molybdenum steel tubing combines maximum longitudinal rigidity with optimum torsional rigidity. On the 2015 SX frame, a forged and milled crossbar connects the two halves of the frame and the tie-rod of the idler mechanism. The absence of welds ensures extremely precise manufacturing tolerances and enhanced safety, while saving 60 grams in weight.

return mechanism / shock absorber

Revamped for this 2015 model year, the shock absorber features a new return mechanism with optimized geometry. A more linear progression with a higher starting rate ensures greater stability while lowering the rear end. What's more, this new design saves a further 40 grams. Fully adjustable, the WP 5018 shock absorber has been perfectly optimized for this new transmission mechanism.

fork

Fully adjustable, WP Suspension's inverted fork has been perfectly matched to the rear shock absorber and the new 22 mm front axle (up from 26 mm) for the 2015 model year. The new axle provides better front-wheel feel, while also reducing weight by a further 40 grams. The new front wheel axle mountings have an offset of only 33 mm instead of 35 mm, providing greater stability with a higher caster angle. They also include new fork protectors that are 50 grams lighter.

fork tees

High-quality CNC-milled fork crowns have been part of KTM's standard equipment for years. They ensure precise handling and clearly emphasize the bending characteristics and hence the responsiveness of the telescopic fork. The new O-ring support for the lower fork head bearing, a redesigned tube and a new steering head bolt save a further 40 grams.

graphics

A new, more stylish deco kit with clear lines underlines the uncompromising demands of this modern off-road bike.

fairing

The aim of KTM designers was to create a more ergonomic and functional fairing, so that every detail of the bike is in perfect harmony with the rider. The plastic mouldings of the front mudguard are a model of solidity thanks to their sophisticated structure and fastening.

saddle

Perfectly ergonomic, the saddle features a tough foam core for enhanced comfort and strength.

air box

The airbox design ensures optimum protection of the air filter from dirt, and maximum air flow for enhanced performance. Changing the Twin Air filter in just a few seconds and without tools has long been standard at KTM.

fuel tank

All SX models feature a 7.5-liter fuel tank made of lightweight polyethylene. Four-stroke motocross models feature the same fuel pump system as four-stroke enduro models, allowing optional installation of larger tanks available in the PowerParts catalog or on enduro models.

handlebars

All SX models are equipped with super-strong Renthal Fatbar 827 tapered handlebars, shaped to meet motocross requirements. The tried-and-tested KTM system allows the handlebars to be fixed in a choice of four positions. The 2015 model has been fitted with softer two-component grips to protect the rider's hands.

wheels

When it comes to wheels, the 2015 version features black-coated Excel rims with lightweight CNC-machined hubs and spokes with light aluminum nipples, to ensure maximum stability for minimum weight. The new Dunlop Geomax MX 52 tires have been designed in collaboration with the KTM USA factory team and offer optimum traction and top performance. The new crowns save a further 50 grams on unsprung weight.

brakes

High-tech Brembo brakes have long been standard on KTM off-road bikes, with lightweight Wave disc brakes for optimum braking performance. Best-in-class motocross brakes, they remain unchanged on this 2015 version.

cylinder head

The DOHC cylinder head boasts optimally dimensioned channels for maximum gas flow and improved cylinder filling. Ultra-light titanium valves and DLC-coated rocker arms allow engine speeds in excess of 13,000 rpm, ensuring spontaneous power delivery and peak performance approaching that of a 450.

crankcase

The 350 SX?F's connecting rod assembly features a plain bearing in the lower connecting rod eye. Two pressed bushes are directly connected to the crank pin. The engine's pressure lubrication system supplies oil to the bearing. This construction is an essential prerequisite for the high revs and impressive peak performance of the 350 cm³ engine. Another decisive advantage for customers is the longer service intervals for the connecting rod, thanks to the plain bearing.

balancer shaft

To balance the masses, the 350 SX-F engine incorporates a multifunction balancer shaft that simultaneously drives the timing chain and water pump.

starter

The 250 SX-F engine features an electric starter as standard. This represents an undisputed advantage in the heat of competitive racing, even if it means a slight increase in weight.

clutch

The highly compact CSS (Coil Spring Steel) clutch features a wear-resistant steel bell and eight highly heat-resistant lined discs made of steel. The clutch bell of the 2015 model has been redesigned and lightened. The clutch springs are made from a new material that offers more consistent behavior both in severe operating conditions and over time. Brembo's hydraulically actuated clutch ensures easy, controllable modulation.

gearbox

The 5-speed gearbox has been specially adapted to the engine characteristics of the 350 SX-F, offering precise, easy gear changes.

engine Management System (EMS)

Keihin's Engine Management System (EMS), with electronic fuel injection, 44 mm throttle valves and the revolutionary injector position developed by KTM, ensures spontaneous response and maximum engine performance. The Map-Select-Switch available in the PowerPart catalog also enables various engine characteristics to be selected via the EMS. A User-Setting-Tool, also available as an option, lets you use a laptop to access motorcycle data and modify ignition and fuel injection mapping with just a few clicks.

News credit: KTM
Image credits: KTMimages