Air Filter Cleaning – Replacement Guide for 2020 Husqvarna FX350

Shop parts for a 2020 Husqvarna FX350 Dirt Bike.

Maintaining your 2020 Husqvarna FX350’s air filter is essential for optimal engine performance and longevity. This guide from MotoSport covers everything FX350 owners need to know about air filter cleaning, inspection, and replacement–with a focus on techniques, care, and model-specific tips.

Why Air Filter Care Matters on the FX350

Your Husqvarna FX350’s high-performance four-stroke engine needs a consistently clean and well-oiled foam air filter. The design of the FX350’s airbox and filter mount makes access straightforward, but diligent maintenance is critical: dirty or improperly fitted filters increase engine wear and can compromise power delivery.

Air Filter Removal – 2020 FX350

  • With the bike cool and on a stand, remove the seat using the quick-release fastener at the rear.
  • Release the air filter cage by unlocking the two integrated tabs on the airbox. Carefully pull the filter and cage assembly straight out.
  • Inspect the airbox for any dirt or debris. For the FX350, this area tends to trap fine dust, especially after dusty trail or desert rides. Always wipe down the air boot opening while the filter is out to prevent dirt from entering the engine.

Cleaning the FX350 Air Filter

  • Tap the filter gently to loosen large debris. Avoid heavy banging to prevent filter damage.
  • Submerge the filter in a designated air filter cleaner solution. Work the cleaner through the foam with gentle kneading–never wring, twist, or squeeze hard, as this can tear seams and break down the foam structure. Avoid highly corrosive cleaning chemicals.
  • Rinse thoroughly with warm, soapy water until the filter runs clear. Multiple rinses may be required for very dirty filters.
  • Dry the filter completely. Either use gentle air (like a compressor at low pressure) or let it air dry in a dust-free environment. Never reinstall a wet filter.

Oiling the FX350 Filter

  • Apply high-quality foam air filter oil evenly to the filter, ensuring full saturation of the foam. Squeeze (do not twist) to distribute oil throughout. Do not leave un-oiled areas, as they provide paths for fine dust.
  • Wipe excess oil from the sealing lip, as the FX350 cage relies on a positive seal in the airbox.
  • If storing a pre-oiled filter, place it in a plastic bag to prevent dirt or lint contamination.

Inspecting – Replacing Your FX350 Air Filter

  • Check the filter for rips, seam failures, or hard spots. Any damage requires prompt replacement to avoid engine exposure to dirt.
  • Examine the filter cage and ensure the tabs and sealing surface are undamaged. Replace the cage if cracked.
  • Install the filter to the cage, lock the assembly into the airbox, and verify a proper seal around the entire perimeter.

FX350 Owner Tips & Notable Practices

  • The 2020 FX350 airbox design provides excellent airflow, but fine dust can bypass a poorly oiled or seated filter. Take extra care in sandy or silty conditions.
  • Husqvarna recommends checking the air filter after every ride, or more often in severe dust. Carry spare pre-oiled filters for race weekends or long trail sessions.
  • The FX350 filter and cage are shared with KTM and GasGas models of the same era, so high-quality aftermarket options are widely available if you plan to rotate multiple filters.

MotoSport Pro Tip

Be gentle throughout the cleaning process–foam filters are durable when treated right, but rough handling shortens their life. Always keep a backup FX350 filter clean, oiled, and ready for quick swaps between motos or trails.

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Disclaimer: This guide is provided for general informational purposes only and is not intended to replace your motorcycle's official owner's manual. Always refer to your manufacturer's documentation for model-specific instructions, torque specifications, safety procedures, and maintenance requirements. If you are unsure or inexperienced, consider seeking assistance from a qualified mechanic or technician.