Features and benefits

WP XACT front fork with AER technology

The 48 mm split air forks feature a capsulated air spring and pressurised oil chamber for progressive and consistent damping. Oil and air bypasses reduce pressure peaks and, in combination with a mid-valve damping system, the forks provide exceptional feedback and rider comfort. The hydrostop improves bottoming resistance through more progressive damping force in the last 40 mm of travel. Additionally, rebound speed is slowed down which leads to the forks staying lower when accelerating after a hard landing.

Settings are easily adjusted via a single air-pressure preload valve, as well as via easy access click adjusters for compression and rebound. The forks dust seals increase protection against dirt intrusion on the fork seals. Additionally, the air pump needed to adjust the fork's air pressure is provided as standard. 

• Updated suspension settings → to work perfectly with the updated frame (less weight, more flex) and rear linkage changes (weight, stiffness)
• WP XACT front forks → 48 mm air type with split damping function
• Mid-valve damping system → exceptional damping and consistent performance
• Capsulated air spring and pressurized oil chamber → progressive and consistent damping
• Hydrostop in the fork legs → improved bottoming resistance and slower rebound
• More progressive damping in last 40 mm of travel (total 310 mm) → previous generation hydrostop only effective in 10 mm of travel
• Reduced rebound → forks stay lower on initial acceleration after hard landing
• Easy access clicker dials → simple and fast clicker settings
• Redesigned fork dust seals → increased protection against dirt intrusion

CNC machined triple clamps

Made from high-grade aluminium, the CNC-machined Factory Racing triple clamps feature optimally tuned steering stem stiffness, perfect alignment of the fork tubes, and precise geometry of the clamps to ensure a highly responsive and smooth fork action. Maximum gains in handling are provided by simple offset adjustment of 20 mm or 22 mm.

The topology-optimised handlebar mounts provide maximised grip surface for less handlebar twist at minimal weight. Additionally, they allow for both rubber-damped and fixed mounting for customisable handlebar flex.

• Rubber damped → less vibration, less precise front-end feel (OE)
• Fixed → increased vibrations, more precise front-end feel 

The front number plate integrates a lower triple clamp protector which guards it from roost.

• CNC-machined aluminium with anodized surface → finest quality and reliability 
• Perfect clamping and alignment → smooth fork action
• Topology optimized handlebar mounts → Optimized grip surface for less handlebar twist
• Rubber damping on top clamp → reduced vibration, increased comfort
• Adjustable handlebar position → adjustable ergonomics

WP XACT rear shock 

The Computational Fluid Dynamics (CFD) optimised main piston in the shock improves initial comfort and provides strong hold-up. Differently sized flow holes allow the shims to open more easily and reduce the overall stress of oil flow and pressure on the shims. Reduced weight also means less moving mass, resulting in lower forces on the main piston. A pressure balance inside the shock ensures consistent damping, resulting in superior rider comfort and feel.

A fully hand-adjustable dual compression control concept allows high and low speed settings to be changed by hand. Together with the rebound adjuster, which is hand or tool adjustable, riders are able to adjust their shock settings without tools and without the help of a mechanic at the racetrack.

On top of the tool-free setting adjustment possibilities, the preload adjuster is optimised for increased resistance to dirt intrusion. The two-piece spring retainer allows for quick shock spring changes without splitting the shock.

The rear linkage geometry has been updated for 2024 and the linkage seals have been revised over 2023. 

Additionally, the new linkage bolt has a smaller diameter to save weight. The overall linkage set-up was developed with Husqvarna Factory Racing to achieve the ideal stiffness.

• Updated suspension settings → focus on optimal bike balance with updated frame (less weight, more flex) and rear linkage changes (weight, stiffness)
• CFD-optimised main piston increases initial comfort and guarantees strong hold-up
• Dual compression control allows high and low speed settings to be adjusted by hand 
• Rebound adjuster allows setting changes to be made by hand or with a tool 
• Preload adjuster optimised for reduced dirt intrusion and quick mounting concept
• New linkage seals for refined rear shock performance and advanced damping characteristics
• Smaller diameter linkage bolt reduces weight and refines overall stiffness
• Pressure balance inside the shock body → consistent damping
• Two-piece spring retainer allows for quick mounting of alternative springs and assembly of preload adjuster and shock

Exhaust system

Both Rockstar Edition models are equipped with an exhaust system that is expertly designed to deliver leading performance at the lowest possible weight. The header pipe features a flow designed resonance chamber that is integrated into the header pipe and is manufactured in two pieces to be as compact as possible. The joining position allows it to be removed without having to remove the rear shock.

• Compact exhaust → lightweight and engineered for optimal performance
• Header pipe mounted directly onto engine mount for improved serviceability
• Header joining position → removal of exhaust without removing rear shock

FMF Factory 4.1 RCT silencer 

The Factory 4.1 RCT silencer features a blue anodised titanium body with a carbon end cap. In addition, it offers a shorter overall length that is less susceptible to damage and moves the muffler closer to the engine to centralise mass. The Factory 4.1 RCT is constructed from aerospace grade materials that meet exacting specifications.

• FMF Factory 4.1 RCT silencer → light weight, optimal performance
• Shorter overall length → centralised mass, less susceptible to damage 

Electric start and Li-Ion battery

Along with the benefit of an easy electric starting system, a Li-Ion 2.0 Ah battery is fitted to the Rockstar Edition models. The Li-Ion battery weighs approximately 1 kg less than a conventional lead battery meaning the convenience of electric starting is delivered while keeping overall weight to a minimum.

• Electric starter → easy starting when time is critical
• Li-Ion battery → lightweight, 1 kg lighter than a conventional battery

Integrated cooling system and radiators 

The radiators are expertly crafted from high strength aluminium. CFD optimisation is used to channel air through the radiators more efficiently and provide optimal cooling in all conditions. The cooling system is channelled through the frame, which eliminates the need for additional hoses. A large centre tube running through the frame reduces pressure at this point in the system, which ensures a consistent coolant flow. An internal thermostat adds reliability.

Additionally, the radiators are mounted close to the centre of gravity for improved handling. 

• Coolant hoses channelled through the frame → maximum cooling efficiency
• Bayonet closure on radiator
• WP radiators → efficient for optimal cooling
• Large central tube → consistent coolant flow

Fuel tank 

The 7.2 litre polythene fuel tank incorporates a threaded filler cap and an internal one-piece fuel pump with integrated filter. This provides improved fuel supply and allows the tank to be emptied further. The external fuel line is specifically positioned to make it less exposed and susceptible to damage.

New and updated is the fuel tank roll (fuel tank holder) for 2024. This holds the tank more securely in place and prevents the tank from chafing the frame.

• New fuel tank roll secures the tank in place while preventing it from chafing the frame
• 7.2 litre polythene fuel tanks → larger capacity for extended running times
• One-piece fuel pump and filter for improved fuel supply → tank can be emptied further
• External fuel line routing → less exposed and susceptible to damage

Airbox and tool-less air filter access

The Computational Fluid Dynamics (CFD) optimised airbox is designed with precisely positioned inlet ducts to prevent air deformation and ensure maximum airflow and filter protection. The air filter is easily accessed, without tools, by removing the left side panel. Easy maintenance is guaranteed by the Twin Air filter element and filter cage design, which offers a simple fail-proof mounting system for safe and accurate filter installation. New for the 2024 is the updated design of the air inlet sleeve and snorkel. This is now a one-piece part to prevent deformation thanks to its more robust design.

• CFD optimised airbox → exceptional air flow and maximised filter protection
• Intuitive filter mounting system → safe and accurate protection against dirt
• Tool-less filter access → quick and easy maintenance
• High-flow airbox cover in the by-pack → added customisability of the engine response
• CFD optimised Airbox → improved air flow and maximized filter protection
• Intuitive filter mounting system → safe and accurate protection against dirt
• Tool-less filter access → easy and fast maintenance
• High-flow airbox cover in the by-pack → added customisability of the engine response
• Updated air intake sleeve and snorkel → one-piece design preventing deformation

Factory Racing Wheel Set

Black high-strength anodised EXCEL Takasago rims are mounted to high quality black anodised and CNC-machined hubs using reinforced spokes and black anodised aluminium nipples to offer maximum weight savings and optimised handling and stability in the most extreme motocross conditions.

• Lightweight but strong and reliable construction → minimum unsprung weight

Tyres

Dunlop GEOMAX MX34 Motocross tyres feature the proven “block-within-a-block” design for more progressive cornering and superior grip are fitted as standard. 

• Developed in top-level AMA Supercross and Motocross → enhanced handling, cornering and steering feel 
• Wide range of application including sand, mud, loose surface, and hard pack
• Increased durability and crack resistance through innovative rubber compound

Bodywork

The FC 250 and FC 450 Rockstar Editions feature bodywork that clearly showcases Husqvarna Motorcycles progressive approach to offroad motorcycles. 

The rider triangle provides exceptional knee contact, especially when riding in the standing position, inspires confidence for riders of every ability and enables them to perform at the highest level for extended periods of time. The slim contact surfaces on the bodywork allow the rider to more easily move the bike around on track and improve the overall handling and agility of the bike. 

Revised tank shrouds add a fresh, progressive, and distinctive new look to both models. This visual design change highlights the many small but important technical changes for 2024. In terms of ergonomics, there are no considerable changes to the previous model years, but access to the rear shock adjusters has been improved by eliminating the shock cover. Additionally, the access for riders who fit a WP XACT Pro Components shock has also been considered with drill markings on the inside of the shroud, which can be used to create extra room for easy adjustability. 

The seat profile has also been revised and is now 5 mm higher and wider at the lowest point. This reduces excessive rearward slipping under hard acceleration. Combined with the race engineered GUTS high grip seat cover, the seat delivers superior control in all conditions. A recessed grip pocket under the seat, just above the airbox, allows riders to grip the machine tighter with their legs.

For 2024, the front fender has been redesigned to incorporate the mounting of the GPS sensor, which works together with the new Connectivity Unit Offroad (CUO) and Ride Husqvarna Motorcycles app.

The graphics on the all-new Rockstar Editions closely resemble the look of Rockstar Energy Husqvarna Factory Racing’s machines for the 2024 season. All of the graphics are applied using durable, in-mould technology for a long-lasting, high-quality finish.

• Progressive bodywork → distinctive looks, race team replica design, and graphics
• Rider triangle optimised for exceptional knee contact, especially when riding in the standing position
• Optimized contact surface → allows for easy gripping and movement of the bike 
• Recessed grip pockets → allowing better grip to lift the bike
• Revised tank shrouds → fresh, progressive new look with single piece design on the right side
• Revised seat profile → heightened seat profile and high grip Factory Racing seat cover for exceptional control in all conditions
• Front fender features the mounting for the GPS sensor

Connectivity Unit Offroad - CUO

The wait is finally over. Husqvarna Motorcycles reintroduces the CUO, which is now fitted as standard on the 2024 FC 250 and FC 450 Rockstar Edition. This technology offers a wide range of functionalities and adjustability options through the Ride Husqvarna Motorcycles app. The hardware consists of two parts: 

1. The CUO itself, mounted on the right upper fork between lower and upper triple clamp 
2. The GPS sensor on the front fender.

Engine

The FC 250 Rockstar Edition engine is tilted 2° backwards and therefore comes with a repositioned sprocket which is 3 mm lower compared to the previous generation. The total engine height has been reduced by 8 mm to improve mass centralisation and reduce weight.

Added service markers on the engine (▲) clearly show where to use washers, making maintenance and service easier than in the past.

All major components and shaft arrangements are carefully designed and placed to best suit the performance and handling characteristics of the machine, and an added benefit of this design is improved anti-squat behaviour from the whole chassis.

The 250cc engine is not only light at 26.11 kg, but also remarkably powerful with an overall output of more than 47 hp.

• Engine design → light and compact for optimised mass centralisation
• Low-friction design → reduces overall drag and vibration
• Outstanding high-revving performance engine → over 47 hp peak power and a 14,000 rpm rev limit
• Easy serviceability of engine internals with added service markers

Cylinder head

The DOHC cylinder head features finger followers with a DLC (Diamond Like Carbon) coating resulting in minimal friction and optimal performance. These actuate large titanium valves (32.5 mm intake, 27.5 mm exhaust) which at the 14,000-rpm limit, open and close multiple times every second to deliver the fuel/air mixture into the combustion chamber for optimal power throughout the rev-range.

The 27.5 mm exhaust valve is a result of the bore/stroke ratio, delivering an optimised gas flow. Valve timings have been adapted to the valve measurements, working in perfect harmony with the camshaft.

For easy serviceability and maintenance work within the engine, the camshaft bearing bridge is screwed and thus increases stiffness. Also, the head gasket comes with a ‘stopper design’, reducing sealing gap oscillations caused by gas force.

• DOHC cylinder head → Advanced durability and serviceability
• Finger followers with DLC coating → reduce friction and guarantee optimal performance
• Large titanium valves (32.5 mm intake, 27.5 mm exhaust) with 27.5 mm exhaust valve → optimized gas flow
• Camshaft → adapted valve timing to valve measurements
• Camshaft bearing bridge increasing stiffness and improving serviceability (screwed design)
• Cylinder head gasket with stopper design → reducing sealing gap oscillations caused by gas force

Cylinder and piston

The 81 mm bore cylinder houses a forged bridged-box-type piston made by CP with an extremely light weight of only 150 g. Both the cylinder and piston are professionally engineered from high-strength aluminium resulting in outstanding performance and reliability. The 48.5 mm stroke and the compression ratio of 14.5:1 provide added torque and peak performance.

Thanks to the CFD optimised combustion chamber, the inlet port could be smaller in section resulting in increased engine responsiveness.

• 81 mm bore and 48.5 mm stroke (2022 = 78/52.3 mm)
• Large 81 mm bore and larger diameter exhaust valves → high-revving, quick response
• CFD optimised combustion chamber → smaller inlet port for improved engine responsiveness
• Compression ratio of 14.5:1 → outstanding torque and peak power
• Forged bridged-box-type piston → high performance and reliability

Crankshaft

The crankshaft is designed to offer the best possible performance while being perfectly positioned in the engine cases to centralise oscillating masses for optimal handling. The plain big-end bearing features two force-fitted bearing shells ensuring maximum reliability and durability, guaranteeing long service intervals of 90 hours.

• Plain big-end bearing with force-fitted bearing shells → increased durability and service intervals
• Friction bearing on the counter-balancer shaft → increased durability

Crankcases

The FC 250 Rockstar Edition engine is designed with mass centralisation and weight reduction as the two main criteria. As a result, the crankcases have been designed to house the internal components of the engine in the perfect positions to achieve the ideal centre of gravity at the lowest possible weight. Engine mounting points are the same as on the FC 450 Rockstar Edition engine.

The casings are manufactured using a high-pressure die-cast production process, resulting in thin wall thickness while retaining exceptional strength and reliability.

• Light and compact crankcases → optimised mass centralisation
• Optimized engine mounting points (as on FC 450 Rockstar Edition)
• High-pressure die-cast production process → thin walls for reduced weight while maintaining strength

Gearbox

Produced by Pankl Racing Systems, the 5-speed gearbox is designed to be extremely light and durable while featuring a 250cc-specific ratio (24:72). The optimized shift shaft reduces the operating forces required for gear changes with a Quickshift sensor on the shift drum ensuring smooth upshifts. The function can be activated/deactivated via the QS button on the Map Select Switch, located on the left side of the handlebar.

The shift fork has a low-friction coating for smoother shifting, while the gear lever is designed to prevent dirt build-up and ensure perfect gear selection in all conditions. An advanced gear sensor allows for specific engine maps to deliver the best possible performance in each gear.

• 5-speed gearbox by Pankl Racing Systems → 250cc-optimised transmission ratio (24:72) and exceptional durability and effortless shifting
• Optimized shift shaft → reduced operating force required for gear changes
• Integrated Quickshift sensor on the shift drum allows clutchless upshifts → seamless shifting function can be activated/deactivated with Map Select Switch
• Integrated gear sensor → specific engine maps for each gear

DS clutch

The FC 250 Rockstar Edition features a Diaphragm Steel (DS) clutch. The exclusive characteristics of this system include a single diaphragm steel pressure plate instead of traditional coil springs.

The clutch basket features the same design as the FC 450 Rockstar Edition but adapted to the transmission ratio. It is a single-piece, CNC-machined steel component that allows the use of thin steel liners and contributes to the compact design of the engine.

• Clutch basket with same design as FC 450 Rockstar Edition → adapted for transmission ratio
• DS clutch → lightweight with consistent action and exceptional durability

Engine

The SOHC engine is the perfect example of the advanced engineering techniques used by Husqvarna Motorcycles to create peak power of more than 63 hp with an overall weight of just 26.8 kg.

Mass centralisation is key to the engine design, enabling chassis engineers to position the engine closer to the centre of gravity for exceptional handling and manoeuvrability. Together with the benefits of mass centralisation and minimal weight, the chassis provides an exceptional anti-squat behaviour for outstanding balance on acceleration and turning.

Additionally, attention was paid to the serviceability of the FC 450 Rockstar Edition engine. Drain bosses for fluids and added service markers on the engine (▲) clearly show where to use washers, making maintenance and service easier than before.

• Peak performance and minimal weight → 63 hp and only 26.8 kg
• Exceptional serviceability of engine internals → added service markers and drain bosses for liquids

Cylinder head

The SOHC cylinder head is incredibly compact and lightweight with a short profile and positions the camshaft as close to the centre of gravity as possible. Parallel frame mounts provide exceptional handling and agility.

Lightweight valves are actuated via a rocker arm and feature timing specifically designed to deliver precise levels of torque and throttle response. The diameter of each intake valve is 40 mm while the exhaust valves are 33 mm. A valve cover reduces the number of mounting screws (only two needed) and a single oil-spray jet guarantees efficient cooling while keeping weight to a minimum.

A fine punched cam chain, low-friction chain guides, and the low-friction DLC rocker arm coating offers optimum efficiency, reliability, and durability. Attention was paid to maintenance tasks with lock positions for the cam chain to provide easy serviceability of the valve train.

• SOHC cylinder head → compact design, parallel frame mounts, and the camshaft is positioned closer to centre of gravity
• Lightweight valve cover → only two mounting screws and one oil-spray jet for cooling
• Fine punched cam chain for added durability
• DLC coating and low-friction chain guides → optimum efficiency, reliability, and durability
• Easy serviceability of valve train → lock positions for cam chain

Cylinder and piston

The lightweight aluminium cylinder is an engineering masterpiece and features a 95 mm bore. The CP bridged-box-type piston features anodised annular grooves, adding durability and longer service intervals while weighing only 327 g. The compression ratio of 13.6:1 provides an outstanding peak performance of more than 63 hp.

• Lightweight aluminium cylinder → 95 mm bore / 63.4 mm stroke
• Lightweight, high-performance CP forged bridged-box-type piston → reduced oscillating masses
• 13.6:1 compression ratio → exceptional peak performance
• Anodised annular grooves → added durability and longer service intervals

Crankshaft

The inertia produced by the crankshaft has been carefully calculated to deliver optimal traction and rideability from the powerful 450cc engine. The crankshaft is specifically positioned to harness the rotational mass at the ideal centre of gravity resulting in a lightweight, agile handling feel. A plain big-end bearing comprising two force-fitted bearing shells ensure maximum reliability and durability, guaranteeing long service intervals of 90 hours.

• Crankshaft position → ideal centre of gravity, improved handling
• Plain big-end bearing and force-fitted bearing shells → increased durability and service intervals

Crankcases

The crankcases are designed to arrange the shafts and engine internals in the ideal positions to offer the best-possible handling. Additionally, the position of the clutch shaft keeps the clutch above the oil level resulting in decreased drag and increased efficiency. A steel oil pump gear and oil jet increase the overall oil pressure to prevent overheating and aids the outstanding durability of the FC 450 Rockstar Edition.

High-pressure die-cast production processes keep overall weight to a minimum, resulting in thin wall thickness while retaining reliability.

• Design → optimised mass centralisation and increased efficiency
• Steel oil pump gear and increased oil pressure → outstanding durability and resistance to overheating
• High pressure die-cast production process → thin walls for reduced weight while maintaining strength

Gearbox

The lightweight 5-speed gearbox is produced by Pankl Racing Systems and ensures the highest level of durability and reliability. A weight-optimised shift shaft reduces the operating force required for gear changes and the gearbox also features a transmission ratio of 29:72. A Quickshifter is positioned on the shift drum to ensure smooth, clutchless upshifts. The function can be activated/deactivated via the QS marked button on the Map Select Switch, located on the left side on the handlebar.

The gear lever features a design that prevents dirt build-up and keeps the lever tip in its original position, even in the toughest conditions. An advanced gear sensor selects a specific engine map tailored for each gear.

• 5-speed gearbox → optimised transmission ratio of 29:72 with smooth and precise shifting
• Weight-optimised shift shaft → reduced operating force required for gear changes
• Integrated Quickshift sensor positioned on the shift drum allows clutchless upshifts → seamless shifting function can be activated/deactivated with Map Select Switch
• Integrated gear sensor → specific engine maps for each gear

DDS clutch

The FC 450 Rockstar Edition features a Dampened Diaphragm Steel (DDS) clutch. The exclusive characteristics of this system include a single diaphragm steel pressure plate instead of traditional coil springs. It integrates a damping system for better traction and durability. The clutch basket is a single-piece CNC-machined steel component that allows the use of thin steel liners and contributes to the compact design of the engine.

• DDS clutch → lightweight with consistent modulation and exceptional durability
• Advanced clutch cooling from pressure lubrication → reduced clutch fade from frequent use

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