Motorcycle specifications KTM450 SX-F 2014 Large artillery

the 450 SX-F is a KTM designed to win; it draws its potential from a large-displacement engine and a perfectly matched chassis. Ryan Dungey won the 2012 AMA MX1 class title on this bike, and he had absolutely no reason to change models to defend his title. Not surprisingly, the compact SOHC engine and its innovative injection technology deliver raw but easily controllable power. The 450 SX-F stands out among the big four-strokes in terms of performance and handling. It's the right choice for all motocross riders who want maximum torque and power in the MX1 class, while retaining easily controllable handling.

eNGINE

The compact 60 hp powerhouse with overhead camshaft and all-new electronic fuel injection shines with unrivalled performance and even more efficient power delivery. The improved crankcase on the 2014 model year further reduces weight.

cYLINDER HEAD

In the 450 SX-F's cylinder head, an overhead camshaft drives four ultra-light titanium valves via the extremely robust, DLC-coated rocker arm on the intake side. This configuration allows engine speeds in excess of 11,500 rpm and contributes significantly to the unique performance of KTM's large-displacement engine. The 2014 model year incorporates a new triple-thickness cylinder head gasket that is even more robust under the most extreme conditions. The now lighter camshaft also features a reinforced automatic decompression mechanism.

pISTONS

The 95 mm-bore cylinder houses an extremely lightweight forged piston with a Box-in-Box design; its light weight makes a major contribution to the engine's low vibration level and high revs. Compression ratio is 12.6:1. The piston pin, optimized for the 2014 model year, ensures greater robustness.

eMBIELLAGE

The connecting rod assembly of the 450 SX-F, with 63.4 mm stroke, 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 the bearing with oil. This construction is an essential prerequisite for the high engine speeds and impressive peak performance of the 450 SX-F. Another decisive advantage for customers is the longer service intervals for the connecting rod, thanks to the plain bearing.

bALANCING SHAFT

The side-mounted balancer shaft also serves as a drive for the water pump. Thanks to perfect mass balancing and the engine's low moving masses, it has been possible to limit vibrations even at maximum engine speeds.

mOTOR HOUSING

For this new 2014 model, the engine crankcase, manufactured using the die-casting process, has been further improved. The elimination of the kick starter dome has saved even more weight than previous models.

eMBRAYAGE

The 450 SX-F engine features a DDS (Damped Diaphragm Steel) clutch developed by KTM, with a wear-resistant steel bell and extremely heat-resistant friction surfaces. A special feature of this design is the use of a spring washer instead of the usual spiral springs, which significantly reduces the force required. The stronger spring washer on the 2014 model year leaves space for the integrated shock hub: an advantage in terms of grip and durability. A drive cleat optimized for the 2014 model year now guarantees even greater strength. Brembo's hydraulically actuated clutch with new clutch cover ensures easy, controllable modulation.

gEARBOX

The 450 SX-F engine features a lightweight 4-speed gearbox, specially adapted to the characteristics of the large-displacement engine and with optimized gear geometry, new for the 2014 model year. For the US market, the 450 SX-F is equipped with a 5-speed gearbox, which is slightly heavier but better suited to the requirements of American customers.

eNGINE MANAGEMENT SYSTEM (EMS)

Keihin's Engine Management System, with electronic fuel injection, 44 mm throttle valves and the revolutionary injector position developed by KTM, ensures spontaneous response and maximum engine performance. The 450 SX-F's wiring harness has been further simplified for the 2014 model year, and the quality of cables and connectors improved. Many connectors are now protected against pressurized steam jets by new rubber grommets. In addition, the Map-Select-Switch available in the PowerPart catalog enables different motor characteristics to be selected via the EMS. In addition, 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.

eLECTRIC STARTER

Like all KTM four-stroke motorcycles, the 450 SX-F can be started at the touch of a button. It's especially in the heat of motocross action that the electric starter becomes an invaluable advantage.

fRAME

The modern frame design of SX models in lightweight, high-strength chromium-molybdenum steel tubing combines maximum longitudinal rigidity with optimum torsional rigidity. This not only ensures good handling and precise steering, but also excellent riding stability.

sUSPENDING ARM

The cast aluminum swingarm has been designed using state-of-the-art calculation and simulation software; the design and wall thickness ensure minimum weight for optimum strength and a perfectly defined flex. For the 2014 model year, engineers have improved the chain guide and its attachment points on the swingarm for greater reliability and reduced weight.

sUSPENSION / DAMPING

Both the rear shock absorber and the 48 mm inverted fork from WP Suspension guarantee optimum damping behavior and responsiveness. For the 2014 model year, the telescopic fork boasts optimized adjustment and greater reserves against shock loads. Fork rebound and compression can be quickly adjusted to the needs of the rider and the track. The rear shock absorber also offers High-Speed and Low-Speed compression damping.

fORK TIPS

High-quality CNC-milled fork tees have been standard equipment at KTM for years. They ensure precise handling and clearly emphasize the flex characteristics and therefore the responsiveness of the telescopic fork.

eXHAUST

FIM noise limits are a huge challenge for motocross manufacturers, and KTM makes every effort to meet them. The 450 SX-F is equipped with hydroformed parts and an additional resonance chamber (Header Resonator System HRS) to deliver superior torque while reducing noise.

bODY

The aim was to create a more ergonomic and functional fairing, so that every detail of the bike would be 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

The perfectly ergonomic saddle of the 2014 model year features an improved foam core for greater comfort and sturdiness.

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 new 7.5-liter fuel tank made of lightweight polyethylene.the inner thread of the lid and the lid itself have been modified, making it easier and more reliable to close. Four-stroke motocross bikes feature the same fuel pump system as four-stroke enduro models, allowing the optional installation of larger tanks available in the PowerParts catalog or on enduro models.

gUIDON

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. For 2014, a large black/silver Renthal Crash Pad provides additional impact protection for the rider.

gRAPHICS

A refined new graphic design with clear lines underlines the uncompromising demands of this modern off-road bike.

wHEELS

Lightweight CNC-machined hubs, top-of-the-range Excel rims and black-coated spokes with lightweight aluminum nipples ensure minimum weight and maximum stability. Pirelli Scorpion MX Mid Soft 32 tires offer perfect grip and excellent performance.

bRAKES

High-tech Brembo brakes have long been standard on KTM off-road bikes, with lightweight Wave disc brakes for optimum braking performance. For the 2014 model year, we note a new brake cocotte with a new compensation reservoir, a smaller piston diameter, and a new lever with optimized kinematics. Thanks to this and the optimized brake pads, front brake performance and dosability have been further significantly improved.

News credit: KTM
Image credits: KTMimages