2021 Husqvarna FX 450 Specifications

Name: 2021 Husqvarna FX 450
Brand: Husqvarna

Enduro / Off-Road • Specs last verified 13 July 2026

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2021 Husqvarna FX 450 Overview

The 2021 Husqvarna FX 450 is an enduro / off-road motorcycle built around 449.9 cc of displacement. Under the tank sits a Single cylinder, four-stroke engine running Single Overhead Cams (SOHC) valve actuation, a compression ratio of 11.8:1. The bore and stroke measures 95 x 63.4 mm. From a practical standpoint, the 2021 FX 450 tips the scales at 101.3 kg, carries a 8.50-litre fuel tank, offers a seat height of 950 mm and spans a 1482 mm wheelbase. That's roughly 97.5 kg lighter than the average enduro / off-road motorcycle in our database. Scroll down for the complete 2021 Husqvarna FX 450 spec sheet covering every technical detail from suspension travel to tyre sizes.

2021 FX 450 - Pros & Cons

Strengths

Factory engineering: The 2021 Husqvarna FX 450 represents Husqvarna's engineering at the time, with a specification built around real-world usability.

Considerations

Carburetor fuelling: Carbureted engines need occasional jetting attention and can be reluctant in cold weather or at altitude compared to modern fuel-injected alternatives.
Tall seat height: The 950 mm seat height will challenge shorter riders - tiptoeing at low speeds is something to factor into your decision.
Modest fuel capacity: The 8.50-litre tank means more frequent fuel stops on longer rides, which is worth planning around on touring routes.
Chain final drive upkeep: Chain final drive needs regular cleaning, lubrication and tension checks to get full life out of the sprockets.

Wear Points & Servicing Notes

Carburetor maintenance

The FX 450 uses carburetion rather than fuel injection, which means jetting is altitude- and temperature-sensitive and benefits from a clean-and-rejet after extended storage or an exhaust change.

Valve clearance checks

Single Overhead Cams (SOHC) valve actuation on the FX 450 means clearances should be checked at the manufacturer's specified interval - they can tighten as mileage accumulates, and a light top-end tick is usually the first sign.

Brake disc and pad wear

The Single disc front brake gives strong, progressive stopping power. Disc thickness and pad depth are worth checking at every tyre change, since worn pads can score the disc surface.

Suspension condition on used examples

Up front, the FX 450 runs WP XACT-USD, Ø 48 mm and WP XACT Monoshock with linkage at the rear. On a used example, check fork seals for weeping oil and test the rear linkage for play - seals are a relatively cheap fix but useful when negotiating price.

Final drive maintenance

Final drive is by chain - expect to clean and lube it every few hundred kilometres and check tension regularly; a neglected chain wears the sprockets faster than the chain itself.

Frame & chassis check

The frame is Central double-cradle-type 25CrMo4 steel - worth a visual check for corrosion or impact damage around the head-stock and swingarm pivot on any used example, since frame damage is far costlier to fix than any service item.

Low-speed handling

At just 101.3 kg, the FX 450 is light enough to manhandle easily at a standstill - one of the practical advantages of its class.

FX 450 - Buying & Maintenance Guide

What to check before buying

When inspecting a used 2021 Husqvarna FX 450, start with the basics: check the service book for oil change frequency, inspect the chain and sprockets for wear, and look for oil seepage around the engine casings and rocker covers. A cold start test is invaluable - a well-maintained FX 450 should fire up cleanly and settle to a smooth idle within a few seconds.

Oil and filter changes

Regular oil changes are the single most important maintenance task on any FX 450. Stick to the manufacturer's interval - typically every 6,000 km or once a year, whichever comes first. Always use the correct viscosity grade as specified in the owner's manual.

Carburetor upkeep

Keep the carburetors clean and free of deposits. If the FX 450 has been stored, strip and clean the carb float bowls before attempting to start it. Pilot jets are the first to block and the last to be checked - always include them in any carb rebuild.

Valve clearance service

Check that valve clearances have been adjusted at the correct intervals on any used FX 450. A bike with clearances out of spec doesn't always feel obviously wrong - but tight clearances accelerate valve seat wear. Ask for service documentation proving it's been done.

2021 Husqvarna FX 450 - Frequently Asked Questions

What engine does the 2021 Husqvarna FX 450 have?

The 2021 Husqvarna FX 450 uses a Single cylinder, four-stroke engine with 449.9 cc of displacement.

How much does the 2021 Husqvarna FX 450 weigh?

The 2021 Husqvarna FX 450 weighs 101.3 kg. This is the manufacturer's dry figure.

What is the fuel tank capacity of the 2021 Husqvarna FX 450?

The 2021 Husqvarna FX 450 has a 8.50-litre fuel tank. At around 5-6 litres per 100 km, that is roughly 141-170 km between stops.

Is the 2021 Husqvarna FX 450 suitable for shorter riders?

The 2021 Husqvarna FX 450 has a seat height of 950 mm. This is towards the tall end of the spectrum and will require most riders under 175 cm to tiptoe at stops.

What brakes does the 2021 Husqvarna FX 450 have?

The 2021 Husqvarna FX 450 uses Single disc at the front and Single disc at the rear.

What tyre sizes does the 2021 Husqvarna FX 450 use?

The front tyre size on the 2021 Husqvarna FX 450 is 90/90-21.

What fuel system does the 2021 Husqvarna FX 450 use?

The 2021 Husqvarna FX 450 uses Carburettor. 44mm Keihin, providing precise fuelling across the rev range and reliable cold-start behaviour.

Husqvarna FX 450 Spec Evolution

The Husqvarna FX 450 was produced across 7 model years (2017-2023). The table below highlights the key specifications that changed across the production run - useful whether you are comparing years or tracking down a specific variant.

Specification	2017	2018	2019	2020	2021	2022	2023
Dry Weight	101.6 kg / 224.0 lbs	101.6 kg / 224.0 lbs	101.6 kg / 224.0 lbs	101.6 kg / 224.0 lbs	101.3 kg / 223.3 lbs	101.3 kg / 223.3 lbs	103.5 kg / 228.2 lbs
Seat Height	970 mm / 38.2 in.	970 mm / 38.2 in.	950 mm / 37.4 in.	950 mm / 37.4 in.	950 mm / 37.4 in.	950 mm / 37.4 in.	948 mm / 37.3 in.
Fuel Capacity	8.50 litres / 2.25 gallons	8.50 litres / 2.25 gallons	8.50 litres / 2.25 US gallons	8.50 litres / 2.25 US gallons	8.50 litres / 2.25 US gallons	8.50 litres / 2.25 US gallons	8.50 litres / 2.25 US gallons
Displacement (cc)	449.30 cc	449.30 cc	449.9 cc	449.9 cc	449.9 cc	449.9 cc	449.9 cc
Displacement (ci)	27.42 cubic inches	27.42 cubic inches	27.45 cubic inches	27.45 cubic inches	27.45 cubic inches	27.45 cubic inches	27.45 cubic inches
Ground Clearance (in.)	14.6 inches	14.6 inches	14.6 inches	14.6 inches	14.6 inches	14.6 inches	13.5 inches
Ground Clearance (mm)	370 mm	370 mm	370 mm	370 mm	370 mm	370 mm	343 mm
Brakes - Rear Diameter (mm)	220 mm	220 mm	-	-	-	-	-

Key Specifications

Engine

Single cylinder, four-stroke

Power

Not published by manufacturer

Torque

Not published by manufacturer

Top Speed

Not published by manufacturer

Weight

101.3 kg / 223.3 lbs

Fuel Capacity

8.50 litres / 2.25 US gallons

Full 2021 Husqvarna FX 450 Specifications

Colours White/blue/yellow

Ground Clearance (in.) 14.6 inches

Ground Clearance (mm) 370 mm

Seat Height 950 mm / 37.4 in.

Wheelbase 1482 mm / 58.3 in.

Dry Weight 101.3 kg / 223.3 lbs

Fuel Capacity 8.50 litres / 2.25 US gallons

Power-to-Weight Ratio 0.6219 HP/kg

Bore x Stroke (in,) 3.7 x 2.5 inches

Bore x Stroke (mm) 95.0 x 63.4 mm

Displacement (cc) 449.9 cc

Displacement (ci) 27.45 cubic inches

Engine Type Single cylinder, four-stroke

Fuel Control Single Overhead Cams (SOHC)

Fuel System Carburettor. 44mm Keihin

Compression Ratio 11.8:1

Ignition Keihin EMS

Starter Electric

Clutch Wet, DDS multi-disc clutch, Magura hydraulics

Final Drive Chain (final drive)

Gearbox 5-speed

Primary Drive X-Ring 5/8 x 1/4´ chain

Frame Type Central double-cradle-type 25CrMo4 steel

Suspension - Front WP XACT-USD, Ø 48 mm

Suspension - Rear WP XACT Monoshock with linkage

Rake 26.5°

Wheel Travel - Front 310 mm / 12.2 in.

Wheel Travel - Rear 300 mm / 11.8 in.

Brakes - Front Single disc

Brakes - Rear Single disc

Tyres - Front 90/90-21

Specifications are compiled from manufacturer documentation and cross-referenced technical sources, and corrected on an ongoing basis. Spot an error? Let us know.