Air Filter Cleaning – Replacement Guide for 2020 KTM 85SX

Shop parts for a 2020 KTM 85SX Dirt Bike.

The air filter on your 2020 KTM 85SX is a critical component for engine longevity, optimal performance, and reliability. Keeping the filter clean or replacing it at proper intervals protects your bike from dust, dirt, and debris – especially crucial for motocross and off-road use.

Important Model-Specific Notes

  • The 2020 KTM 85SX uses a straightforward airbox design. A single long bolt holds the seat, enabling quick removal for air filter access — no tools required, just slide the seat back after removing the bolt.
  • The airbox cover can be pulled off laterally toward the front; this exposes the air filter directly for maintenance.
  • Owners should only use KTM-approved filter oils and cleaners to avoid damage. Foam air filters are standard on this bike.

How to Remove – Inspect Your Air Filter

  1. With the bike off and cool, locate the long seat bolt under the rear fender and remove it.
  2. Slide the seat backwards; set aside.
  3. Move to the airbox cover. Pull it off laterally (towards the front tire) to expose the filter.
  4. Grip the filter cage firmly and pull the filter out.

Cleaning Procedure

  1. Check filter type: Most owners use regular foam with oil; if yours is biodegradable, use compatible cleaner.
  2. Immerse the filter in a container of appropriate solvent. Massage the filter gently to remove oil and dirt, keeping dirt away from clean sections.
  3. Rinse thoroughly with clean water until no discoloration or debris remains.
  4. Dry the filter completely, avoiding direct sun or high heat.
  5. Apply fresh air filter oil evenly. Massage into the foam, ensuring full saturation without excess dripping.

Reinstallation – Inspection

  1. Once the filter is clean, oiled, and dry, inspect edges for wear or damage. Replace if any tears or poor sealing is present.
  2. Place the filter back onto the cage. Secure tabs or prongs as designed.
  3. Reinstall the airbox cover and seat; ensure the long seat bolt is securely fastened.

When to Replace Your Air Filter

  • Replace the air filter every third or fourth cleaning, or sooner for heavy dust conditions.
  • Inspect after every ride; if the foam is discolored, torn, or no longer sealing tight, install a new filter for best protection.

Additional Tips for 2020 KTM 85SX Owners

  • KTM's seat and airbox access design makes maintenance quick; do not overtighten the long seat bolt on reinstallation to prevent stripping.
  • Always wear gloves when cleaning or oiling filters; solvents and oils can irritate skin.
  • Store spare clean, oiled filters in sealed bags for quick swaps at the track.

Caring for your air filter on the 2020 KTM 85SX is simple with the right steps and keeps your engine running strong for every MotoSport adventure.

Related Shopping Categories

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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.