Air Filter Cleaning – Replacement Guide for 2018 Husqvarna TC85BW

Shop parts for a 2018 Husqvarna TC85BW Dirt Bike.

The 2018 Husqvarna TC85BW stands out in the 85cc motocross category, blending lightweight performance with a potent two-stroke engine and advanced features found on full-size Husqvarna motocross models. Protecting your engine’s longevity and performance starts with proper air filter maintenance. Below, MotoSport.com provides a complete, proprietary guide for cleaning and replacing the air filter on your TC85BW.

What Makes the 2018 TC85BW Unique?

  • Engine: 84cc liquid-cooled two-stroke, digital ignition, and robust six-speed transmission for power and precise response.
  • Suspension: WP upside-down 43 mm front fork and a rear monoshock – exceptional for racing and off-road handling.
  • Design: Modern steel double cradle chassis with race-bred ergonomics as well as increased suspension travel for the big wheel (19/16-inch) configuration, differentiating it from the standard TC85.
  • Air Box Placement: The air filter is easily accessible under the right side number plate, streamlining service compared to older designs.

When to Clean or Replace the Air Filter

  • After every ride in dusty or sandy conditions
  • Every 2-3 rides in moderate conditions
  • Immediately if you notice reduced engine performance or visible filter dirt
  • Replace the filter if it is damaged, torn, or excessively worn (foam breakdown)

Tools – Supplies You’ll Need

  • Latex gloves
  • Clean rags
  • Air filter cleaner (solvent or specialized detergent)
  • Bucket
  • Air filter oil (foam-specific)
  • Plastic bag (for oiling)
  • Mild soap and water (for filter cage/plastic)
  • OEM or quality aftermarket air filter for replacement, if needed

Air Filter Removal

  1. Remove the seat and right side number plate. The TC85BW’s number plate is tool-less; simply unclip it upward to expose the airbox.
  2. Loosen the filter retaining knob or quick-release tab. Slide the air filter and cage assembly out gently.
  3. Carefully disconnect the foam filter from the supporting cage.

Cleaning Process

  1. Inspect the cage for cracks or wear; wash it with mild soap and water, then dry thoroughly.
  2. Place the airborne filter foam in a bucket with your air filter cleaner. Work the cleaner through the foam using gentle squeezing – do not twist or excessively wring.
  3. Rinse under cool running water until all dirt and cleaner are gone.
  4. Gently squeeze all excess water from the foam. Let dry in a well-ventilated area.

Oiling – Reinstallation

  1. Once dry, pour air filter oil evenly over the foam or use the plastic bag method: Place foam and oil inside a bag, knead to ensure complete saturation. The filter should be sticky, not dripping.
  2. Install the clean, oiled filter back onto the cage – ensure a secure fit along all sealing edges.
  3. Inspect the airbox seal area. Wipe away any old oil or sand to ensure a tight seal. Insert the air filter assembly and fasten the retaining knob/tab securely.
  4. Reinstall the side panel and seat, ensuring a snug fit with no gaps for dirt intrusion.

Pro Tips from MotoSport

  • Always keep a spare air filter pre-oiled and ready. Fast swaps ensure fresh filtration for each race or ride session.
  • Check the condition of the filter cage and gasket every time. Any cracks or warping can allow dirt into the engine – use only OEM-grade replacement parts for the TC85BW’s specific fit.
  • The 2018 TC85BW’s advanced intake system means filter service is fast – never skip this step for best power and engine durability.
  • Never run the engine without the filter in place, even for brief periods.

Key Owner Considerations for the 2018 TC85BW

  • With the 85cc two-stroke and high-revving powerband, even tiny dirt particles can cause engine wear. Stay vigilant with your filter routine, especially after muddy or dusty rides.
  • The big wheel (BW) model ensures better stability and ground clearance—keep the airbox region clean to preserve chassis balance and airflow.

Proper air filter care is a simple but essential step for getting the most out of your 2018 Husqvarna TC85BW—MotoSport.com has the filters, cleaners, oil, and OEM parts to keep you ahead of the pack.

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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.