Air Filter Cleaning – Replacement Guide for 2018 Honda CRF250LR

Shop parts for a 2018 Honda CRF250LR Dirt Bike.

The 2018 Honda CRF250LR features a viscous-type air cleaner element designed for reliable off-road and dual-sport performance. Maintaining the air filter is critical for optimal engine health, longevity, and consistent throttle response, especially when riding in dusty or wet environments. Below is MotoSport’s proprietary guide for cleaning and replacing your CRF250LR air filter.

What Makes the 2018 CRF250LR Air Filter Unique?

  • Viscous type filter: The filter cannot be cleaned with compressed air or solvents, as it may degrade performance and filtration efficiency.*
  • Regular replacement cycle: Honda recommends replacing the filter every 12,000 miles (19,200 km), or more often if used in harsh or dusty conditions.*
  • Replace, don’t try to wash: Unlike foam filters used on some dirt bikes, this OEM filter is panel-style and not intended for re-use after washing.*

*Refer to your owner’s manual for full maintenance notes.

Tools & Supplies Needed

  • 5mm Allen wrench
  • 6mm Allen wrench
  • Phillips screwdriver
  • Replacement OEM or performance air filter

Replacement Procedure – Step by Step

  1. Remove the seat: Use the 6mm Allen wrench to remove both seat bolts. Slide the seat backward for removal.
  2. Remove the right body side panel: Locate and remove the bolts holding the side panel with the 5mm Allen wrench. Carefully pry the panel away from the retainer clips.
  3. Access the airbox: Use the Phillips screwdriver to remove the airbox cover screws. Lift the cover to access the filter.
  4. Remove the air filter: Gently slide the old air filter out of the airbox, noting orientation for correct installation of the new element.
  5. Install a new filter: Place the new filter in the airbox, making sure the seal is tight with no gaps or misalignment. For best results, always use a high-quality OEM or specifically designed aftermarket replacement.
  6. Reassemble: Secure the airbox cover and reinstall the side panel, making sure all clips and bolts are properly tightened. Replace the seat and torque the bolts appropriately.

Special Notes for CRF250LR Owners

  • The 2018 CRF250LR Rally/ABS uses a panel-style viscous element, not a traditional foam filter. Cleaning with compressed air or washing with solvents is not advised and can significantly reduce engine protection.
  • If you ride off-road or in dusty locales, check and replace the air filter much more frequently than the standard 12,000 mile interval.
  • Always inspect the airbox for dirt or debris before installing the new filter. Wipe the interior with a clean, damp cloth if necessary.

Why Air Filter Maintenance Matters

  • Protects against dirt ingestion, which can cause engine wear – especially critical for dual-sport models used on dirt roads.
  • Ensures consistent engine performance, throttle response, and fuel economy.
  • Neglecting filter maintenance on the CRF250LR’s unique design can accelerate engine wear or reduce the expected performance lifespan.

Keep your 2018 Honda CRF250LR running strong with regular air filter servicing – the right parts and process make all the difference 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.