Husqvarna: 2011 Husqvarna TC449 Dirt Bike Motorcycle

HUSQVARNA TC449: A NEW BREED

The design of the new 449 outstrips that of other off road models and stands out immediately for its looks, exclusive layout and cutting-edge technology.

Husqvarna TC449, Husqvarna Motorcycles, Motorcycles, Husqvarna Dirt BikesDESIGN AND LAYOUT

The line is completely new: slim, svelte and refined. The single piece side panel runs from where traditionally the fuel tank would be, all the way back to the rear mudguard, allowing the rider free and unhindered movement.

There is no chance of snagging boots or pants on the edges of the panels with this design.

Besides the aesthetic and ergonomic aspects, the new design also makes maintenance easier as the air filter, rear shock and throttle body can all be accessed with ease.

The long seat, which runs from the rear mudguard to the steering head, offers completely free longitudinal movement.

MASSES AND CENTER OF GRAVITY

The idea behind the TC 449 is ‘mass centralisation’ – to keep the weight of the bike concentrated as close as possible to the centre of gravity and to design a chassis which adapts perfectly to the demands of competitive Enduro racing.

This solution, which Husqvarna calls CTS (Coaxial Traction System), eliminates the variation in the length of the chain during rear suspension movement, minimising the effect of the final drive on the bikes handling. This solution allows a longer swing arm whilst still retaining a wheelbase similar to our competitors, ensuring greater traction, which for Enduro means tangible advantages.

The chassis layout allows the modern DOHC engine to be mounted closer to the centre of the bike, whilst tilting the cylinder further forward allows a long and straight air intake path at the same time as keeping the centre of gravity as low as possible.

Again, continuing the theme of mass centralisation, the two part fuel tank design provides a total of 8.5 litres capacity in a low mounted 2 litre pump housing and a 6,5 litre under seat main tank. The under seat fuel tank layout permits the airbox to be located in a protected and fluidodynamically favourable position above the engine with the actual air intake being at the height of the steering column, in a raised and sheltered position to minimise the intake of dust or water.

REFERENCE PERFORMANCES

The TC 449 is equipped with a cutting-edge 4 valve dual camshaft engine which has been significantly improved thanks to the experience gained by Husqvarna in its many years of offroad racing. The motorcross version stands for the engine which has been specifically tuned for MX use, delivering significantly more power than the Enduro version.

The timing and camshaft profiles are completely different as is the compression ratio which has increased to 13:1 instead of 12:1 in the Enduro version. The electronic injection system still uses a 46mm Keihin throttle body but is fitted with a single flap instead of the Enduro twin flap version to provide a sharper, more aggressive throttle response. Additionally, the TC449 is fitted with a dual mode switch on the handlebars, which allows access to two different fuel injection / ignition timing maps to provide a softer power delivery for low traction conditions.

The titanium exhaust system with carbon fibre tipped silencer has been developed specifically by Akrapovic and the five speed transmission has specific ratios for use in MX. The suspension is provided by Kayaba with multi adjustable sealed cartridge front forks matched to a Kayaba fully adjustable rear shock.

HANDLING AND PERFORMANCE

The perimeter design chassis is made of high strength steel tubing. The geometry of the rear suspension is revolutionary, with a new linkage mounted on top of the alloy swing arm.

This solution offers many advantages: it increases the ground clearance, improves general reliability thanks to the reduced exposure of the components and makes maintenance easier. But there’s more: dynamically, by exploiting the advantages of the double cradle frame made in high strength steel tubing, the roughness of the ground is absorbed more gradually, attenuating the stresses on the rider.

The advantages when jumping are also remarkable with the recoil effect of the rear wheel being significantly reduced and the smoothness of the suspension is particularly perceivable on rougher and more difficult ground.

COAXIAL TRACTION SYSTEM

A real refinement in the field of chassis design and exclusive to the TE/TC 449/511 range is the CTS, the Coaxial Traction System. The advantages of the CTS system compared to the traditional systems are huge. During the suspension movement along the whole stroke, the chain is not subject to any change in length.

The tension of the chain remains constant regardless of the swing arm position, while the chain and sprockets benefit from reduced wear. An important positive effect on the riding characteristics is the marked reduction of the impact of alternating the load on the transmission.

More in general, the values obtained by adopting the CTS have a much more uniform trend in all conditions, leading to improved ridability and stability of the motorcycle.

TOP OF THE RANGE COMPONENTS

The new TC is equipped with the most advanced components in the Off Road sector. For the front brake, there is a Brembo system with floating caliper and 260 mm wave rotor, while the rear brake consists of a floating calliper operating on a 240 mm rotor.

The suspension is entrusted in full to the specialists of Kayaba, with 48 mm forks, adjustable for compression and rebound damping and a Kayaba rear shock absorber designed specifically for Enduro use with settings optimised in collaboration with the racing team.

New Husqvarna TC 449: the perfect combination of elements to win every challenge.

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