FC 350

01. Faster and wiser

Engine

The FC 350 engine is designed to deliver maximum performance with all major engine components and shaft arrangements positioned to enhance overall handling. Weighing just 59.9 lbs (27.2 kg), the 350 cc 4-stroke engine centralises mass and aids the anti-squat behaviour of the whole chassis.

Cylinder head

Fully redesigned for 2023, the DOHC cylinder head offers improved durability and serviceability, with Diamond Like Carbon (DLC) coated finger followers to guarantee minimal friction and optimal performance. These actuate large titanium valves, 36.3 mm for the intake and 29.1 mm for the exhaust, which optimise gas flow for strong, usable power access the rev-range, all the way up to the 13,400 rpm limit. Revised valve timings work in perfect harmony with the redesigned camshaft which now features a new bearing bridge designed to increase stiffness and improve serviceability.

Cylinder and piston

A large 88 mm bore and 57.5 mm stroke cylinder is professionally engineered from high-strength aluminium for maximum reliability, and houses the high performance forged bridged-box-type piston from CP. For 2023, the compression ratio is increased to 14.6:1 for improved torque and peak power. Engine responsiveness is further improved thanks to optimised valve guides and valve shaft diameters precisely engineered using computational fluid dynamics (CFD).

Crankshaft

At the centre of the high-output, high-revving FC 350 engine is a crankshaft featuring a plain big end bearing rotating on two force-fitted bearing shells. Ensuring maximum reliability and durability, the crankshaft offers long service intervals of 90 hours.

Crankcases

Designed for optimised mass centralisation, the FC 350 crankcases house all internal components in the perfect position to achieve the ideal centre of gravity. Manufactured using a high-pressure die cast production process, the result is a thin, exceptionally strong wall thickness at the lowest possible weight.

DS clutch

The FC 350 features a durable diaphragm steel (DS) clutch. Engineered from a single piece of CNC-machined steel, the clutch basket uses thin steel liners, which contribute to the compact design of the engine.

Gearbox

Produced by Pankl Racing Systems, the 5-speed gearbox is designed to be extremely light and durable while featuring optimised and proven motocross-specific gear ratios (24:72). Integrated into the shift drum, a Quickshifter sensor can be activated by pressing the QS marked button on the Map Select Switch to further aid smooth upshifting.

Engine

Cylinder head

Cylinder and piston

Crankshaft

Crankcases

DS clutch

Gearbox

02. Ride easier

Lightweight frame

The proven chromium molybdenum steel frame is refined for 2023. A new shock mounting, which is no longer connected to the main tube, significantly improves the anti-squat behaviour of the chassis. With optimised wall thickness in high stress areas improving reliability, the frame continues to offer advanced geometries and flex characteristics aimed at providing unparalleled rider feedback, energy absorption, and exceptional straight-line stability. The frame is finished off in a premium metallic blue powder coating with redesigned standard frame protectors offering superior protection, durability, and grip in any condition. Additionally, the inclusion of forged brackets on the lower frame rails allows for easy installation of the skid plate, which is available as a technical accessory.

Polyamide-reinforced aluminium subframe

Made from 60% polyamide and 40% aluminium, the two-piece subframe ensures exceptional strength and durability at an overall weight of just 3.9 lbs (1.8 kg). The lower subframe spars and frame mounts are manufactured from cast aluminium for significantly improved reliability. The upper section of the subframe is made from injection-moulded polyamide to enable specific flex characteristics and ensure a lightweight construction.

CNC machined triple clamps

Working in unison with the frame design and suspension set-up, the CNC-machined triple clamps provide precisely calculated geometry for increased stability. Handlebar flex can be customised with the handlebar clamp, which offers two mounting options - rubber-damped for less vibration, or fixed for enhanced front-end feedback. The upper triple clamp is stiffer to ensure a smoother fork action and plays a vital role in the perfect alignment of the front wheel for superior handling.

WP XACT front suspension

New shim stack settings improve the overall balance, cornering agility, and riding comfort on the FC 350 for 2024. The 48 mm WP XACT forks are designed as a closed cartridge system with a capsulated, adjustable air spring and pressurized oil chamber for smooth action and consistent damping. Oil and air bypasses reduce pressure peaks and in combination with a mid-valve damping system, together with a hydrostop, which applies a progressive damping force in the last 40 mm of travel, the forks provide precise feedback to the rider. The settings are easily adjusted via the single air pressure pre-load valve, as well as through easy access click adjusters for compression and rebound. Additionally, the air pump needed to adjust the fork's air spring pressure is provided as standard.

WP XACT shock absorber

The WP XACT rear shock offers 293 mm of travel. Inside the shock is a computational fluid dynamics (CFD) optimised main piston for improved initial comfort, which provides strong hold-up in all conditions. Differently sized holes in the shims, which feature updated stack settings for 2024 to improve balance and handling, allow them to open more easily, which reduces the overall stress of the oil flow. Complete with low friction SKF seals fitted throughout the linkage system, consistent damping, comfort, and traction are guaranteed with rebound and both high and low speed compression adjustable by hand.

Swingarm

The hollow die-cast aluminium swingarm is manufactured from a single piece of aluminium using an improved die-cast production process for optimal stiffness and a 190 g weight reduction over previous generations. In order to optimise and match the flex characteristics from the frame, a 22 mm rear axle is fitted. Additionally, the chain guard and chain slider have been designed for improved durability and are less prone to catching on external objects.

Lightweight frame

Polyamide-reinforced aluminium subframe

CNC machined triple clamps

WP XACT front suspension

WP XACT shock absorber

Swingarm

03. Effortless ergonomics

Functional bodywork

Clean, Swedish-inspired design and ergonomics are tailored to allow riders to perform at their best for extended periods of time. Adapted after countless hours of testing, the contact points and surfaces in the rider triangle have been repositioned for 2023 to improve comfort on the motorcycle. A new, flatter seat offers unrestricted movement with a high grip cover ensuring riders stay firmly in place under hard acceleration.

Airbox

Designed with precisely positioned inlet ducts aimed at reducing drag and air flow deformation, the airbox ensures unrestricted airflow with maximum filter protection. The Twin Air filter is easily accessed without tools, by simply removing the left side panel for easy maintenance. Offering further performance customisation, the FC 350 is delivered with an additional airbox cover that can be changed without the use of any tools for a sharper throttle response based on rider preference or track conditions.

Hydraulic clutch

The high-performance Brembo hydraulic clutch system guarantees even wear, near maintenance-free operation, and perfect action in every condition. With this hydraulic system, free play is constantly compensated so that the pressure point and function of the clutch remain identical in cold or hot conditions, as well as over time. Countless hours of race-focused testing have proven the high-quality, Italian-made Brembo hydraulic systems' exceptional reliability.

Hydraulic brakes

The highest level of quality is guaranteed as the class-leading Brembo brake callipers are made from single pieces of aluminium for exceptional strength at the lowest possible weight. Together with a 260 mm front and a 220 mm rear disc, which are designed to prevent mud build-up, superior stopping power and braking confidence is guaranteed in all conditions.

ProTaper handlebar

Developed between Husqvarna Motorcycles and leading handlebar manufacturer ProTaper, the exclusive bend offers superior comfort, class-leading strength, and fatigue resistance at the lowest possible weight.

ODI grips

ODI lock-on grips feature an innovative, integrated throttle mechanism and are installed without using glue. The throttle assembly offers easy free-play adjustment with the option to fit alternative cams for a personalised throttle action.

Footrests

The CFD-designed footrests are extra wide to ensure better control of the machine while at the same time are less susceptible to catching on deep ruts, take-offs when scrubbing, and trackside barriers. This is achieved by a narrower mounting design in the frame layout, which also helps reduce overall weight.

Functional bodywork

Airbox

Hydraulic clutch

Hydraulic brakes

ProTaper handlebar

ODI grips

Footrests

04. Master your art

Wheels and tyres

Assembled with CNC-machined hubs, lightweight spokes, and strong, black-anodised alloy rims by Excel Takasago, the wheels of the FC 350 are then fitted with Dunlop Geomax MX33 Motocross tyres, which feature a proven block-within-a-block design for more progressive cornering and superior grip. For improved on-track agility, the 110/90-19 rear tyre and 80/100-21 front tyre ensures optimal handling on a variety of riding surfaces.

Exhaust system

The exhaust system on the FC 350 features a flow-designed resonance chamber, which plays a vital role in delivering class-leading performance. Manufactured in two pieces and designed to be as compact as possible, the header pipe allows for the system to be removed without removing the rear shock. The silencer has a short and efficient design, moving weight closer to the centre of gravity and ensuring impressive power while keeping noise as low as possible. A black coating highlights the premium quality of the silencer.

Cooling system

Manufactured from high-strength aluminium, the radiators are designed using computational fluid dynamics (CFD) to channel air through them in the most effective way. A large centre tube through the frame reduces pressure at this point in the system for a consistent coolant flow while an internal thermostat further enhances reliability.

Fuel tank

A new 1.9 gallon fuel tank integrates neatly into the revised bodywork. Due to the new fuel pump design and position, the tank is emptied further for increased running times. For improved safety, the external fuel line is specifically routed to make it less exposed and susceptible to damage.

Wheels and tyres

Exhaust system

Cooling system

Fuel tank

05. Technologically advanced

Map select switch

The intuitive handlebar-mounted Map Select Switch allows riders to activate Launch and Traction Control, enable the Quickshifter, and allows riders to toggle between two engine maps. The easy-to-operate Map Select Switch allows racers to quickly alter and set up the engine characteristics on a race by race basis dependent on track conditions and rider preference.

Quickshift

The Quickshifter function can be activated or deactivated via the Map Select Switch and works by interrupting the ignition for a fraction of a second when upshifting. A sensor on the shift drum registers the force from the shift lever, sends a signal to the ECU, and ensures smooth gear changes - even when the throttle is fully open. To prevent unintended shifts and false neutrals, the function is only active from second gear upwards.

Traction Control

Traction Control on the FC 350 is engaged by pressing the button marked 'TC' on the Map Select Switch and functions by analysing throttle input from the rider and the rate at which engine RPM increases. If the RPM increases too quickly, the engine management system (EMS) registers a loss of grip and reduces the amount of power to the rear wheel to ensure maximum traction. This is a distinct advantage in wet or muddy conditions.

Launch Control

With the engine at idle, Launch Control is engaged by pressing the Traction Control and Quickshifter buttons simultaneously. Both symbols will start flashing to indicate that Launch Control is active. This function limits the amount of power to the rear wheel, improving traction, and preventing loss of control under hard acceleration. Once a gear change is made, the Launch Control will deactivate automatically. Additionally, the Quickshifter function is deactivated when Launch Control is engaged.

Mapping

For personalised power delivery, the FC 350 has two built-in engine maps as standard. Map 1 (white) offers linear, predictable power, while Map 2 (green) is more aggressive for a sharper throttle response and more explosive power output.

EMS

The new Engine Management System (EMS) is designed to be smaller and lighter while being faster at processing data. It incorporates a new rollover sensor (ROS) which cuts the ignition and shuts off the engine for safety in the event of a severe crash, adding another level of security to the Husqvarna Motorcycles' new generation motocross line-up.

Hour meter

The hour meter comes with an integrated fuel level indicator, which is visible on the FI status LED, and warns the rider when the fuel level is getting low.

Start/stop switch

The combined start/stop switch is located on the right side of the handlebar for easy, thumb-operated use. Not only simplifying the starting and stopping of the engine, the removal of a designated stop only button from the handlebar reduces the risk of potential damage or activation in the event of a fall.

Electric start

As with all 4-strokes in the Husqvarna motocross range, the FC 350 starts with the ease of pressing a button thanks to electric start. A lightweight Li-Ion 2.0 Ah battery is fitted, giving the convenience of electric starting while keeping overall weight to a minimum.

Map select switch

Quickshift

Traction Control

Launch Control

Mapping

EMS

Hour meter

The hour meter comes with an integrated fuel level indicator, which is visible on the FI status LED, and warns the rider when the fuel level is getting low.

Start/stop switch

Electric start

01. Faster and wiser

Engine

Cylinder head

Cylinder and piston

Crankshaft

Crankcases

DS clutch

Gearbox

Engine

Cylinder head

Cylinder and piston

Crankshaft

Crankcases

DS clutch

Gearbox

02. Ride easier

Lightweight frame

Polyamide-reinforced aluminium subframe

CNC machined triple clamps

WP XACT front suspension

WP XACT shock absorber

Swingarm

Lightweight frame

Polyamide-reinforced aluminium subframe

CNC machined triple clamps

WP XACT front suspension

WP XACT shock absorber

Swingarm

03. Effortless ergonomics

Functional bodywork

Airbox

Hydraulic clutch

Hydraulic brakes

ProTaper handlebar

ODI grips

Footrests

Functional bodywork

Airbox

Hydraulic clutch

Hydraulic brakes

ProTaper handlebar

ODI grips

Footrests

04. Master your art

Wheels and tyres

Exhaust system

Cooling system

Fuel tank

Wheels and tyres

Exhaust system

Cooling system

Fuel tank

05. Technologically advanced

Map select switch

Quickshift

Traction Control

Launch Control

Mapping

EMS

Hour meter

Start/stop switch

Electric start

Map select switch

Quickshift

Traction Control

Launch Control

Mapping

EMS

Hour meter

Start/stop switch

Electric start

Technical Details

Engine

Chassis