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Home / Bikes /MX / 350 SX-F

350 SX-F

ktm-350-sx-f

SHREDDING WITH NIMBLE AGILITY

The new KTM 350 SX-F continues to deliver a dominant mix of horsepower and agility. For 2019, it has gained even more performance and torque, bringing it ever closer to the power of a 450, without losing its 250-like agility. When you're looking for more than one advantage, this powerful, lightweight racer combines all your needs into one dominant package with serious championship pedigree to back it up.

CRANKSHAFT

CRANKSHAFT

The KTM 350 SX-F's crankshaft features a stiff design and utilizes a short, lightweight connecting rod, contributing to the incredibly dynamic and efficient power delivery. The big end bearing features two force-fitted bearing shells, which run directly on the crank pin. This design is a prerequisite for the extremely high engine speed levels and the unrivalled power of the 350cc. The design also enhances durability, allowing for long crankshaft service intervals - resulting in less effort and cost and more time spent on two wheels.

ENGINE & EXHAUST

Neatly arranged in a compact and light (26.6kg) construction, the engine of the 2019 KTM 350 SX-F features many new enhancements. A new clutch, improved transmission and a redesigned, lighter DOHC (double overheard camshaft) cylinder head, all contribute to making it stronger than ever before. Fitted with the latest electronic fuel injection system and a useful electric starter, just one push of a button fires up this impressively smooth and competitive engine.

CYLINDER HEAD

CYLINDER HEAD

The cylinder head on the KTM 350 SX-F is the gateway to its excellent power. For 2019, it has been reworked to further improve performance, as well as reduce the weight by an incredible 200 g. It features two overhead camshafts with a friction-optimized super-fine surface, connected to DLC coated finger followers, which activate four lightweight titanium valves (intake 36.3 mm, exhaust 29.1 mm). KTM engineers worked their magic to maximize the flow rate, resulting in optimal power band, with outstanding performance across the entire 13,400 rpm range.

CRANKCASES AND ENGINE COVERS

CRANKCASES AND ENGINE COVERS

The compact engine cases are manufactured using a high pressure die-cast production process that helps with weight reduction, while retaining strength and durability. The design allows for optimal shaft arrangements close to the center of gravity, resulting in ideal mass centralization and easier ride-ability. Plus, the new engine covers feature a smart surface structure that reduces wear caused by the rider's boots, keeping them looking as fresh as the day you bought it.

EXHAUST

EXHAUST

When it comes to improved power delivery and performance, the new exhaust on all 4-stroke models play a key role and packs a punch that is hard to beat. It features a new, model-specific header pipe with a further advanced resonator called FDH (Flow Design Header), which is a small chamber around the pipe. The silencer has a new profile aluminium sleeve and a new end cap, as well as a reworked internal design. The new shape allows the exhaust to be disassembled without removing the shock absorber and also provides better access to the shock. Another benefit of the new shape is slimmer ergonomics, making the bike feel narrower, without compromise to regulatory noise limits.

CHASSIS

The KTM 350 SX provides an unrivalled combination of agility and power. The chassis on this model plays an integral role in its renowned maneuverability and also provides accurate feedback between track and rider. For 2019, a new lightweight, high-tech steel frame was developed and has been optimized for more accurate rider feedback. Its refined flex characteristics ensure the bike soaks up those big hits while still delivering excellent agility and high-speed stability. The chassis also features additional innovative elements, like "no dirt" footpegs and new brackets for mounting an optional composite skid plate. Overall, every element of the chassis contributes to an intuitive, high performance ride like no other.

FRAME

FRAME

Like the rest of the SX range, the frame on the KTM 350 SX-F is professionally crafted from hydro formed Chromium Molybdenum steel tubes. The frame is robot welded to ensure the highest levels of consistent quality. The frame stiffness was improved for more nimble handling, while improved synergy with the suspension ensures excellent high-speed stability. The frame features "nodirt" footpegs with a simple but effective self-cleaning system that ensures the footpegs return to their original position, for total control in all conditions. On all the 4-stroke frames, three new brackets allow an optional composite skid plate which is offered in the KTM PowerParts program, to be fitted. The 2019 SX range frames feature the highly durable powder coating featured on the KTM Factory machines and come with standard frame protectors. The updated subframe is 40 mm longer and made from lightweight aluminium. It provides improved rear fender stability and easier movement across the seat.

SWINGARM

SWINGARM

The KTM 350 SX-F features a new one-piece gravity die-cast aluminum swingarm. This construction process offers exceptional strength at the lowest possible weight. For simpler and more accurate chain maintenance, the measurement markings are visible from above.

WHEELS

WHEELS

KTM uses lightweight, CNC-machined hubs and high-end Excel rims on all SX models, guaranteeing maximum stability and minimum weight. For 2019, the aluminum spoke nipples feature a reworked design, which conveniently reduces the frequency with which the spokes need to be tightened. The wheels are fitted with the latest Dunlop Geomax MX 3S tires, delivering maximum grip and stability and effectively transferring all the power to the ground.

FRONT SUSPENSION

FRONT SUSPENSION

All full-size SX models are fitted with the super-lightweight WP AER 48 front fork. It is a 48 mm USD air-sprung fork with separate functions for each fork leg, meaning damping functions are on the right side and the air spring is on the left. The left leg features a two-chamber system with a capsuled air cartridge, helping prevent loss of air pressure. Essentially, this means that in the rare case of a leaking outer seal, the internal cartridge pressure keeps the bike in a normal position. The air spring is exceptionally easy to use and can be adjusted to any rider weight via a single air valve and the air pump that is supplied with the bike. The right fork leg integrates a damping cartridge to fit single damping leg requirements and can be adjusted to the track conditions and the rider's preferences. (compression from top, rebound from bottom, 30 clicks each). For 2019, new settings on the damping side have improved the damping characteristics, providing great front end feel and control.

REAR SUSPENSION

REAR SUSPENSION

All SX models feature a DDC monoshock, which has been developed to work as a complete unit with the entire frame and swingarm architecture, as well as the linkage system and the AER 48 forks. It features high-quality machined and anodized components, which add a touch of class and give it appeal beyond just a functional necessity. Internally, the shock houses an updated main piston and new settings that provide improved damping characteristics, perfectly complimenting to the reworked front-end setup. It is fully adjustable, including high and low speed compression, allowing you to set the shock up precisely to suit any track and rider's preferences.

TRIPLE CLAMP

TRIPLE CLAMP

All SX models feature top quality, CNC-machined triple clamps and have become somewhat of a KTM trademark. For 2019, the triple clamp has been reworked with stiffer upper clamps (22 mm offset for all models) to suit the reworked frame stiffness and flex characteristics of the latest WP AER forks. The result is a front end that works in perfect harmony with the frame, improving overall handling and stability. The rubber damped handlebar fixation reduces vibration and also allows for some adjustment with 2 different mounting positions. An hour meter is fitted as standard on the upper triple clamp on all SX models, keeping the rider informed of the number of hours spent tearing up the track and when the next service is due.

BRAKES

BRAKES

High-tech Brembo brakes have always been standard equipment on all KTM motocross bikes. Combined with lightweight wave discs, the renowned system provides the highest level of braking efficiency, enabling you to out-brake the competition.

FUEL TANK

FUEL TANK

A lightweight polyethylene tank with a capacity of 7.0 liters. The fuel tank cap has an inside thread, which makes for easy and reliable closure.

AIRBOX

AIRBOX

The new airbox on the KTM 350 SX-F has been completely reworked to ensure better flow dynamics, and together with new intake snorkels, leads to optimal power and throttle response. Despite the obvious performance enhancements, the new design also offers maximum protection against soiling of the air filter. The large Twin-Air air filter is mounted on a cleverly designed stiff cage that minimizes incorrect installation. As found on previous models, filter maintenance is quick and easy and does not require tools - a standard, original feature from KTM.

ERGONOMICS & COMFORT

A rider's ability to work together with the bike depends on how quickly and easily he can maneuver around his motorcycle. In order to ensure optimal rider control, KTM has focused extensively on the best ergonomics for high-level performance. The neutral riding position is comfortable and, through various handlebar positions, can also be adjusted to suit every rider and condition. A rider's main interaction with the motorcycle comes through the bodywork, seat, footpegs and handlebars and these crucial contact points play a vital role in a rider's ability to maintain balance and control. When it comes to ergonomics, KTM chose to use only the best quality products, ensuring the KTM 350 SX-F, as well as the entire SX range, provide unrivalled feeling and control out on the track.

SEAT

SEAT

All SX models have a newly shaped seat, designed to match the improved ergonomics. The seat cover features newly developed silicone strips that provide better feel and grip for the rider. The seat is conveniently fixed to the bike using one long, lateral screw, making it safe and easy to handle.

HANDLEBAR

HANDLEBAR

All full-size SX models are equipped with the same high-strength aluminum tapered handlebar, made by NEKEN. The handlebar is fixed in rubber damped mountings, which allow for two different positions. The handlebars come standard with an ODI vulcanized grip on the right side and a comfortable ODI lock-on grip, which does not require any wire or glue, on the left. They also feature a reworked bar-pad with a newly designed cover that can be attached and removed a lot quicker and easier. These handlebars allow the rider to hold on to this bike's 450-like power, while riding it like a 250.

FOOTPEGS

FOOTPEGS

Sophisticated 'No Dirt' footpegs prevent clogging of the footpeg pivot, even when digging in deep ruts. Looking for a higher riding position? Then just mount the footpegs of the MY2018 EXC models, which are 6mm higher than the SX versions.

BODYWORK & GRAPHICS

The KTM 350 SX-F is a standout performer that has already made a huge impact in the industry. However, with the help of KTM's factory riders, as well as KTM R&D and Kiska Design, the new bodywork on this radical machine makes an even bigger statement than before. The new design features on all the 2019 SX models and achieves complete harmony between rider and bike, down to the finest details. The designer's main goal was to provide the perfect contact points for the rider to enjoy maximum freedom of movement and improved handling. The I-beam design for the front and rear fenders are prime examples of the intelligent design that appears in every element of the bodywork, guaranteeing maximum stability at the lowest possible weight. Simply riding a KTM 350 SX-F attracts the attention of onlookers, but the new graphics definitely makes them turn for a second look.

DECALS

DECALS

A new, tailor-made kit and a Factory orange frame. Because in this sport, champs deserve to look the part regardless of the dirt.

SOFTWARE & ELECTRONICS

The KTM 350 SX-F is a revolutionary motorcycle at the forefront of progression in motocross. It features innovative electronics that help to refine its incredible power-toweight ratio, maximizing power delivery. Activated by a multifunctional handlebar map switch, a rider has instant access to traction control, launch control and even alternative power curves. KTM's engineers have spent many hours pushing the extremes of performance, making electronics a necessary innovation that ensures the most effective power delivery. KTM SX-F models also have the advantages of a proven electric starter. Just one simple push of a button and you're READY TO RACE.

BATTERY & WIRING HARNESS

BATTERY & WIRING HARNESS

All SX-F models feature a new, more capable, super lightweight 2 Ah Lithium-Ion starter battery, ensuring even safer starting of the engine, especially in cold weather conditions. The packaging of the voltage regulator and condenser has been reworked to concentrate all the electrical components in a common area below the seat, making the entire system even more reliable.

TRANSMISSION

TRANSMISSION

The KTM 350 SX-F is now fitted with a new, more robust 5-speed transmission. The gear ratios were carried over from the predecessor, but all the gears feature improvements and reinforcements. Another highlight of the transmission is the no dirt gear shifter. Similar to the footpeg design, it prevents the build-up of dirt and ensures the next gear is always available, no matter what the conditions.

ENGINE MANAGEMENT SYSTEM

ENGINE MANAGEMENT SYSTEM

The state-of-the-art Keihin Engine Management System, with electronic fuel injection, features a new 44 mm throttle body. The injector position is unique and guarantees optimal atomization of the fuel and air on the way to the combustion chamber, resulting in instant response and maximum performance when opening the throttle. There are also separate systems for cold starting and idle adjustment, while an improved seal of the MAP sensor (MAP = Manifold-Absolute-Pressure) makes the system even more reliable. A reworked throttle cable mount allows for easy access and smoother routing of the cables. Additionally for 2019, the ECU features new maps which have been adapted to the new exhaust and cylinder head, regulating traction and launch control. It also provides different maps for each gear, according to the information received from the gear sensor, ensuring maximum power as you shift through the gears.

CYLINDER AND PISTON

CYLINDER AND PISTON

The 88 mm bore cylinder houses a lightweight, forged, bridged, box-type piston, made to the highest standards by CP. It has an extremely rigid structure and features a unique crown shape to suit the high-compression combustion chamber. The compression ratio is at 14:1 and thanks to the combination of low oscillating masses, the engine displays extremely lively characteristics.

BALANCER SHAFT

BALANCER SHAFT

The high engine speed of the KTM 350 SX-F produces a significant amount of inertia. To counter these mass-forces, the engine is fitted with a multifunctional counter balance shaft. It effectively reduces vibration, as well as drives the water pump and timing chain.

CLUTCH

CLUTCH

A newly developed DS (diaphragm steel) clutch, literally puts the control back in the hands of the rider. It features a durable, one-piece clutch basket and primary gear, made of high-strength billet steel, guaranteeing unbeatable reliability. It is fitted with extremely heat-resistant steel carrier friction discs, which are pre-tensioned by means of a diaphragm spring, ensuring the most effective disengagement of the clutch. This design substantially reduces the operating force required to pull the clutch and is made even easier with the Brembo hydraulic system.

E-STARTER

E-STARTER

The standard electric starter on the KTM 350 SX-F uses a proven starter drive and a strong starter motor made by Mitsuba. It provides quick and reliable starting, saving you precious time and energy when you need it most, always ensuring the strongest possible race finish.

HANDLEBAR MAP SELECT SWITCH

HANDLEBAR MAP SELECT SWITCH

Within easy reach of the left grip on all four-stroke models, is a multifunctional handlebar map switch, which features the innovative control functions; traction control; launch control and alternative power curves (standard <-> advanced). The TRACTION CONTROL is a unique feature which has a new setting for 2019. It guarantees more efficient traction and better control when accelerating the bike, especially in challenging track conditions. It can be activated on the handlebar map switch while riding. With a simple push of the two buttons at idle speed, the rider can also activate LAUNCH CONTROL, ensuring the most effective launch out of the gate. Thanks to a reworked set-up, the Launch Control now benefits from directly from the Traction Control, reducing wheel spin for maximum possible traction. The map switch also gives the rider the chance to select an alternative power map, besides the standard configuration, providing him with options during the race.

Engine

  • Design

    1-cylinder, 4-stroke engine

  • Displacement

    349.7 cm³

  • Bore

    88 mm

  • Stroke

    57.5 mm

  • Starter

    Electric starter

  • Transmission

    5-speed

  • Clutch

    Wet, DDS multi-disc clutch, Brembo hydraulics

  • EMS

    Keihin EMS

Chassis

  • Frame design

    25CrMo4 steel central-tube frame

  • Front suspension

    WP-USD, AER 48, Ø 48 mm

  • Rear suspension

    WP shock absorber with linkage

  • Suspension travel (front)

    310 mm

  • Suspension travel (rear)

    300 mm

  • Front brake

    Disc brake

  • Rear brake

    Disc brake

  • Front brake disc diameter

    260 mm

  • Rear brake disc diameter

    220 mm

  • Chain

    5/8 x 1/4"

  • Steering head angle

    63.9 °

  • Ground clearance

    370 mm

  • Seat height

    950 mm

  • Tank capacity (approx.)

    7 l

  • Weight READY TO RACE (without fuel)

    99.5 kg

The illustrated vehicles may vary in selected details from the production models and some illustrations feature optional equipment available at additional cost.
All information concerning the scope of supply, appearance, services, dimensions and weights is non-binding and specified with the proviso that mistakes, printing, setting and typing errors may occur; such information is subject to change without notice.