Air Filter Cleaning – Replacement Guide for 2018 Husqvarna FX350

Shop parts for a 2018 Husqvarna FX350 Dirt Bike.

The 2018 Husqvarna FX350 is engineered for competitive performance, making regular air filter cleaning & replacement essential for peak operation. Unique to this model, the FX350 features a high-flow air box that enhances engine breathing, but this means the air filter is exposed to more contaminants in off-road conditions. Neglecting filter maintenance will quickly diminish throttle response and may lead to costly engine repairs.

Tools & Supplies Needed

  • Gloves
  • Air filter cleaning solution (biodegradable preferred)
  • Air filter oil (foam filter-specific)
  • Lukewarm water
  • Clean towels/rags
  • New air filter (if replacing)

Step-by-Step Cleaning Instructions

  1. Remove the seat & access the air box. Use the FX350’s quick-release seat mounts for easy access behind the right-side panel. Avoid getting excess dirt into the intake by gently brushing debris away from the air box perimeter before removing the filter.
  2. Disengage air filter from the cage. The FX350 utilizes a snap-tab system – release both tabs to loosen the filter, then carefully work the filter off the cage by gently pulling on one edge and rotating it free.
  3. Prep for cleaning. Remove major debris from the filter’s surface with a towel. Do not wring the foam filter like a rag, as this can damage the material. Avoid using compressed air or shop vacs in the air box area due to fire hazard risks.
  4. Wash & clean. If using a biodegradable oil, use its matching cleaner; otherwise, use dedicated air filter cleaner. Submerge the filter in cleaner for 10–15 minutes, occasionally agitating gently to release dirt and oil. Never use gasoline to wash the FX350’s filter as repeated exposure degrades Husqvarna’s foam media.
  5. Rinse thoroughly. Rinse the filter in lukewarm (never hot) soapy water, followed by a clean, cold water rinse. Repeat if necessary until no odor remains and water runs clear. Squeeze gently to remove excess liquid – never twist or wring.
  6. Dry & re-oil. Let the filter air dry away from direct sunlight. Evenly massage filter oil into all surfaces, paying attention to the seams and perimeter. The FX350’s air box design means dust can easily enter through the edges – apply a light bead of filter grease to the filter lip for a superior seal.
  7. Reinstall filter & seat. Refit the clean, oiled filter onto the cage, ensuring both tabs snap securely into place. Double-check the seal before replacing the seat.

Replacement Tips for the 2018 Husqvarna FX350

  • Inspect the filter for tears, brittle foam, or degraded glue lines every cleaning interval. The FX350 benefits from using genuine Husqvarna air filters to maintain optimal fit & airflow.
  • Replace the air filter immediately if any damage is detected or after every 10–20 hours of dusty riding.

Model-Specific Notes

  • The FX350’s air box design is similar to KTM siblings, with a unique snap-on cage for quick maintenance.
  • To maximize engine longevity, use foam filter oils designed to withstand frequent cleaning.
  • Regularly inspect for excess dust or moisture buildup in the air boot. The FX350 is susceptible to filter edge leaks due to the wide air box – always ensure a positive seal after servicing.
  • Upgrading to an OEM air filter screen is recommended for added protection in sandy environments.

Maintaining your 2018 Husqvarna FX350’s air filter is a simple investment for reliable power and long engine life. Remember, clean air means clean performance – keep your FX350 ready for every ride.

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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.