Husqvarna
FC 350

The in-between, done right

Engine

349.7 cm³, 57 hp, 27.2 kg. The FC 350 is for riders who want 450 pace without 450 mass: it revs like a 250 and pulls like the big bike out of the turn, with every major component placed to centralise mass and calm the rear under power. Service markers (▲) on the cases show where the washers go, so maintenance is faster and harder to get wrong.

• 349.7cm³
• 57 hp
• 102.5 kgwithout fuel

Titanium, to 13,400

DOHC cylinder head

Twin-cam head with DLC-coated finger followers for minimal friction, working large titanium valves — 36.3 mm intake, 29.1 mm exhaust — for strong, usable power all the way to the 13,400 rpm limiter. The camshaft bearing bridge adds stiffness and makes servicing simpler.

14.6 to 1

Cylinder and piston

88 mm bore, 57.5 mm stroke, in a high-strength aluminium cylinder with a CP forged bridged-box piston. Compression is 14.6:1 — torque out of the corner and peak power at the end of the straight. Valve guides and valve-shaft diameters were sized in CFD for the response.

90 hours between

Crankshaft

A plain big-end bearing rotating on two force-fitted bearing shells, at the heart of a high-output, high-revving engine. It is the reason a 13,400 rpm four-stroke can carry a 90-hour service interval — reliability and durability designed in, not hoped for, and fewer rebuilds on the team calendar.

Thin walls, strong case

Crankcases

High-pressure die-cast cases that put every shaft exactly where mass centralisation wants it, for the best possible handling. Thin walls, high strength, lowest possible weight — the crankcase is part of how the bike handles and how much of it you have to lift out of a rut, not just a box for the gears.

Steel, single piece

DS clutch

A diaphragm steel clutch: one diaphragm pressure plate instead of a set of coil springs, in a basket CNC-machined from a single piece of steel with thin steel liners. It is the same durable clutch design as the FC 450, and it is what keeps the engine as narrow as it is.

Five, by Pankl

Gearbox

Pankl Racing Systems five-speed with proven motocross ratios and a 24:72 primary — light, durable, and precise. A quickshifter sensor is integrated into the shift drum: press QS on the map switch and upshifts go through clean under full load.

Grip it with your knees

Bodywork

Bodywork designed for a rider to perform for the length of a moto. Larger contact points and surfaces in the rider triangle mean comfort, and comfort means less fatigue in the last ten minutes. A higher, wider seat lets you move; the revised tank shrouds and a high-grip cover keep you planted under hard acceleration.

Breathe in deep

Airbox

One-piece airbox, stiff enough not to deform under load, so the intake tract keeps the shape it was designed in and the engine gets an unrestricted feed without exposing the filter. The Twin Air filter comes out without tools — pull the left side panel, check, replace, done.

Same bite, every lap

Brembo hydraulic clutch

Brembo hydraulic clutch. Free play is compensated automatically, so the bite point is in the same place cold, hot and after twenty hard laps, and the plates wear evenly. Near maintenance-free — and one less thing to fiddle with on the line.

260 up front

Brembo brakes

Brembo callipers machined from single pieces of aluminium front and rear, on a 260 mm front disc and a 220 mm rear, both cut to shed mud rather than pack it. Strong, consistent stopping in every condition, and a rear pedal built to survive being dragged through ruts.

An exclusive bend

ProTaper handlebar

ProTaper aluminium bar in a bend developed with Husqvarna Motorcycles and used on nothing else. Ø 28/22 mm tapered, light, class-leading strength, and built to resist fatigue — the bar's and yours. Comfort at the bars is not a luxury; it is where the last five minutes of a moto are won or lost.

No glue

ODI grips

ODI lock-on grips with the throttle mechanism built in, fitted without glue or safety wire — a grip change between motos is a two-minute job. Free play is adjusted at the throttle assembly, and you can swap cams for a quicker or slower throttle action to suit the rider and the track.

Boot hold

Footrests

CFD-shaped footrests, extra wide for control when standing, on a narrower mounting in the frame layout. Less to catch on a deep rut, a take-off when scrubbing, or a trackside barrier — and a little less weight while it is at it. Boots stay where you put them, in the wet as well as the dry.

One switch

Map Select Switch

One handlebar switch runs the electronics: two engine maps, traction control, the quickshifter, and launch control. Set the bike up for the track in front of you, race by race, without a laptop or a trip back to the van.

Clutchless upshifts

Quickshifter

Press QS on the map switch and the engine cuts the ignition for a fraction of a second on every upshift. A sensor on the shift drum reads the force on the lever and tells the ECU — clutchless, full-throttle changes without a hiccup. Active from second gear up, so no false neutrals off the line.

Spin into drive

Traction control

Press TC and the EMS compares your throttle input with how fast the revs rise. If the rpm climbs faster than the rear wheel can use, it registers a loss of grip and trims the power until it hooks up again. In the wet, in mud, or on a hard-pack start straight, it turns wheelspin into drive.

First to the turn

Launch control

At idle, press TC and QS together. The symbols flash, and the ECU limits power to the rear wheel until you change gear — enough to keep the front down and the rear driving through the first thirty metres. The quickshifter is disabled while launch control is active, so nothing surprises you before the first turn.

White or green

Mapping

Two maps built in: Map 1 (white) is linear and predictable, Map 2 (green) is sharper and more explosive. Neither is a compromise — one suits a slick, hard track, the other suits sand and deep loam. Switch on the bars.

Count the hours

Hour meter

An hour meter with a fuel-level indicator built in, shown on the FI status LED. It counts the hours the service schedule is written in — so a team knows exactly where every bike is — and it warns you when the tank is getting low before the engine does.

Thumb it

Start/stop switch

One combined start/stop switch on the right of the bar, thumb-operated. No separate kill button to break off in a crash or hit by accident when you are up on the pegs — start it, stop it, same switch. Simpler for the rider, and one less part on the bars to replace.

Press and go

Electric start

Like every four-stroke in the Husqvarna motocross range, the FC 350 starts on a button. The lithium-ion 2.0 Ah battery is light enough that the convenience costs you nothing on the scales — and a stall on lap twelve costs you two seconds, not the moto.