450 SX-F 2013 - OVERVIEW
A completely new, significantly lighter engine, featuring groundbreaking injection technology, guarantees brutal yet controllable power. Packed into a chassis, which has been improved massively in terms of bodywork, frame and suspension, the KTM 450 SX‑F 2013 sets a new benchmark among the 450 four-strokes in terms of performance and manoeuvrability with its easy handling.
REAR SUSPENSION »
The linkage rear suspension with WP shock absorber was reworked for MY2013 for all models. Beside some weight reductions of bolts, bearing cups and washers of the linkage system the settings of the shocks have been completely updated. In addition the 350 SX-F is fitted with a harder spring. Of course it is KTM standard to a low individual clicker adjustment (rebound and high/low speed compression damping) for any kind of rider and race track.
SWING ARM »
Aluminium cast swing arm provides perfect stability at minimum weight. For MY2013 the swing arm is reinforced and now allows the mounting of a larger rear axle to work together with the new frame concept for improved riding stability.
Modern and lightweight frame design made of chromoly steel provides optimal mix of stiff-ness and flexibility for maximum track stability, easy handling and precise cornering.
After just two years the bodywork is completely reworked to further improve the bike ergonomics and indicate clearly, that model year 2013 means a new generation for KTM SX.
FRONT SUSPENSION »
The further improved 48 mm WP closed cartridge Upside-Down fork shines with completely reworked settings for all models and harder springs for 250 and 450 SX-F. A newly developed fork oil provides reduced friction and improved durability for more constant damping characteristics during its entire life cycle.
FUEL TANKS »
The 7.5 litre fuel tanks have been reworked for 2013 to match the shape of the new spoilers for improved ergonomics. In addition they feature a new inner screw-type fuel cap.
TRIPLE CLAMPS »
Further developed CNC machined triple clamps improve the bike´s stability and provide improved fork clamping, supporting the fork action due to reduced friction and better bending characteristics. In addition the lower clamp features a weight reduction of 80g due to the reworked design. The front fender is attached by two screws on the bottom and two in the front.
Newly designed airbox and cover provides more space for the TWIN AIR filter. New intake snorkels for all 4-stroke models allow for better airflow and higher performance. The exchange of the airfilter is possible without any tools in just a few seconds. The airbox cover features standard clips to be fixed, optionally it can be secured by an additional screw.
High strength EXCEL rims, CNC machined hubs and new spokes coated in black guarantee maximum stability. The Pirelli Mid Soft 32 tires stand for outstanding traction. A stronger rear axle (20 >25 mm) improves the stability of the bike.
All models are fitted with new 827 Renthal Fatbar handlebars featuring the equivalent bend of the 996 Twin-wall. New 2-compound grips with KTM logo provide excellent contact to the bike.
EXHAUST SYSTEM »
Future noise limits will be a real challenge for every manufacturer, therefore KTM put a lot of effort into developing new exhaust systems for all 4-stroke models, which meet the tough limits of the 2013 season and even improve the bikes performance.
COOLING SYSTEM »
The proven cooling system is transferring the cooling liquid from the cylinder through the frame triangle to the new WP radiators.
The proven Brembo brakes in combination with the WAVE discs and stainless steel brake lines provide the best brake performance. The rear caliper carrier is adapted to the larger rear axle.
A completely new graphic design in conjunction with the new bodywork is a clear statement to underline the performance of the new SX generation.
The new 450 SX-F has proven its performance from the very first moment, when Super Cross star Ryan Dungey started to race the bike in the most prestigious race series in the world, the AMA Super Cross. The newly developed SOHC four-stroke engine incorporates the entire KTM engineering and race know-how combined with the latest engine technology which means a major advantage in terms of weight, compactness and engine performance.
CYLINDER HEAD »
The design of the cylinder head is based on the 450 EXC engine, but features newly developed ports, combustion chamber and valve train. The lightweight titanium valves and the new, extremely lightweight design of the rocker arms (intake rocker arm is sliding on a DLC coated contact directly on the new cam shaft) allow for the rpm limit of 11,500 rpm and a high power output of 60 hp.
ENGINE CASES »
Compared to My 2012 the new 450 cc engine is much more compact and is fitted with engine cases produced in die cast instead of sand cast. This allows a thinner wall thickness and means a massive weight reduction of more than 2.5 kilogram!
PISTON & CYLINDER »
In the 95mm bore of the cylinder (predecessor 97mm) a new, weight optimised König piston with a stiff box-in-box design provides a compression ratio of 12.6:1.
COUNTER BALANCE SHAFT »
The new 450 SX-F engine is fitted with a laterally mounted counter balancer, which at the same time drives the water pump. This solution allows a very compact and light-weight engine design.
CRANK SHAFT »
The lightweight PANKL crank shaft with a stroke of 63.4 mm (predecessor 60.8 mm) is fitted with a PANKL connecting rod featuring a pressure lubricated plain bearing (no more needle bearing), which allows a high rpm limiter and doubles the maintenance intervals.
The 450 SX-F is fitted with a reliable and lightweight electric starter. This is an outstanding feature and means a major advantage especially when restarting after a crash, even though this solution means higher weight compared to a pure kickstart engine. For those who want to reduce the weight to a minimum the 450 SX-F allows the electric start to be replaced with a kickstarter.
The DDS (Damped Diaphragm Steel) one-piece clutch basket combined with the primary gear is made of high-strength steel. It guarantees unbeatable reliability and contributes to the narrow engine size due to its compact rivetless design. Additionally, it allows the use of thin steel linings, which makes the whole clutch package compact. A diaphragm spring makes it possible to implement an additional rubber damping system, guaranteeing reliability for the transmission and good traction. The hydraulic clutch by Brembo in conjunction with the diaphragm spring guarantees a very light operation and good controllable modulation of the clutch.
A new 65 watt alternator secures the energy needed to run the electronic fuel injection safely and charge the battery.
A new 5-speed transmission was developed to perfectly suit the 450 cc power plant and provides easy and precise shifting.