Air Filter Cleaning – Replacement Guide for 2024 Honda CRF125F

Shop parts for a 2024 Honda CRF125F Dirt Bike.

The air filter is one of the most critical maintenance items on your 2024 Honda CRF125F. Regular inspection, cleaning, and replacement are essential for keeping your mini-moto running strong, especially in off-road conditions where dust, dirt, and moisture are always present. Proper upkeep preserves engine power, extends engine life, and helps prevent costly engine repairs.

Why Air Filter Care Matters for the 2024 Honda CRF125F

The CRF125F uses a high-quality foam air filter that traps even fine dust particles, protecting your engine from abrasive contaminants. Neglect can lead to poor performance, spark plug fouling, reduced power, and severe internal engine wear. Servicing the filter more often than recommended is vital when riding in especially dusty, sandy, or wet environments.
Owners should only use a genuine Honda filter or an equivalent dual-stage foam option for maximum filtration efficiency–this airbox is specifically designed for optimal fit and airflow and improper filters may result in premature engine wear .

Tools & Supplies Needed

  • 8mm or 10mm socket & ratchet
  • Clean shop towels
  • Air filter-specific cleaning solvent (no gasoline)
  • Air filter oil (for foam filters)
  • Gloves
  • Replacement filter (if necessary)

How to Access the Air Filter

  1. With the engine off and cool, place the bike on a stand.
  2. Remove the left side cover by releasing its fasteners.
  3. Unlatch the two retainer clips and remove the air cleaner housing cover .
  4. Unhook the set spring, carefully avoiding bending.
  5. Remove the air filter from its housing .

Cleaning the Air Filter (Reusable Foam Type)

  1. Gently tap the filter to remove loose dirt.
  2. Wash it in a bath of foam filter cleaner or dish soap in warm water. Never use gasoline or solvent not intended for foam as it can degrade the filter material.
  3. Rinse thoroughly, then gently squeeze out water–never wring or twist.
  4. Allow to air dry completely (do not use compressed air or heat sources).
  5. Once dry, liberally apply air filter oil to the entire foam. Work it in to coat all surfaces.
    Tip: Use gloves to keep your hands clean during oiling.
  6. Lightly squeeze out any excess oil so it does not drip.

Inspecting & Replacing the Air Filter

  • Check for rips, tears, or hardened foam. If damaged, install a new filter immediately (pre-oiled foam options are readily available).
  • Also inspect the airbox for water, mud, or debris, and clean as needed.
  • Reinstall the filter in the housing, ensuring the set spring is correctly positioned.
    Secure the airbox cover and reinstall the side panel.

Special Considerations Unique to the 2024 CRF125F

  • The CRF125F filters use a two-stage or dual-layer foam design for maximum protection and airflow. Always ensure the replacement meets or exceeds OEM specs.
  • Never install the filter dry–this leads to poor filtration and increased engine wear.
  • Use only Honda Genuine or verified aftermarket filters for the 2024 model year–the airbox shape and filter fitment evolved with this generation.
  • If you ride in extreme conditions (deep water, heavy mud, or sand), inspect and service the air filter more frequently for optimal reliability .

Pro Tips from MotoSport

  • Keep a spare pre-oiled air filter handy for quick swaps between motos.
  • Clean the filter more regularly if riding with others–roost from other bikes can clog your filter faster.
  • Always check your filter after each ride to prevent trouble before it starts.

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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.