Air Filter Cleaning – Replacement Guide for 2017 Honda CRF450RX

Shop parts for a 2017 Honda CRF450RX Dirt Bike.

Maintaining a clean air filter is essential for the performance and longevity of your 2017 Honda CRF450RX. The right care not only protects the engine from damaging dirt & debris but also ensures the bike produces optimal power throughout every ride. This MotoSport.com guide details how to clean – and when necessary, replace – your CRF450RX air filter.

Understanding the 2017 CRF450RX Air Filter

The 2017 CRF450RX uses a dual-stage foam air filter constructed for high-flow and efficient filtration. Aftermarket options like Twin Air, Motorex, and Tusk are popular for this model, all using a combination of coarse and fine foam layers for maximum protection and airflow. The dual-stage setup is critical for off-road conditions because it stops sand, dust, and even the smallest debris before they get to your intake.

Tools & Materials Needed

  • Replacement or spare air filter (pre-oiled style optional)
  • Air filter-specific cleaning solution
  • Filter oil (if filter is not already pre-oiled)
  • Basic hand tools for airbox access
  • Vacuum or shop towels
  • Contact cleaner (for airbox)
  • Grease (for sealing rim)
  • Gloves and eye protection

How to Remove the Air Filter

  1. Remove the seat by undoing the seat bolts and sliding the seat off to access the airbox.
  2. Carefully loosen and remove the thumbscrew or bolt securing the air filter holder.
  3. Lift the air filter away from the airbox, taking note not to drop any dirt into the intake tract. Plug the intake with a clean rag if necessary during service for safety.

Cleaning Process

  1. Gently tap the filter to remove loose dirt.
  2. Apply air filter-specific cleaner and massage through both foam layers.
  3. Rinse with clean water, starting from the clean side out to avoid driving dirt deeper into the foam.
  4. Repeat until all dirt, dust, and oil have been removed.
  5. Squeeze (do not wring) water from the filter and allow it to air dry completely away from direct heat.

Oiling & Installing the Air Filter

  1. Once dry, apply air filter oil evenly through both foam layers, ensuring it is fully impregnated but not dripping.
  2. Apply a thin, continuous bead of waterproof grease around the sealing rim of the filter.
  3. Reinstall the air filter element, ensuring it is seated correctly and the seal fully contacts the airbox sealing surface.
  4. Tighten the air filter retainer securely but do not overtighten.
  5. Reinstall the seat.

When to Replace the Air Filter

  • Replace any filter with tears, holes, hardened foam, or degraded seams.
  • Many riders keep a spare pre-oiled filter for easy swap-outs at the track or trailhead.

Special Considerations for the 2017 CRF450RX

  • The 2017 CRF450RX airbox design prioritizes airflow for aggressive off-road power, but this also means it must be protected from dust. Frequent servicing is highly recommended for dusty or muddy riding conditions.
  • OEM and most aftermarket filters offer dual-layer construction, which is essential for your model’s power characteristics and engine longevity. Do not use single-layer or automotive-style filters.
  • The air filter cage and mounting design is similar to the CRF450R, so maintenance techniques used on those models are directly relevant.
  • Inspect the filter cage and ensure it’s free from cracks or broken welds. Replace if damaged to ensure a perfect filter seal.

Pro Tips

  • Mark each cleaned filter with the date, so you never go too long between maintenance intervals.
  • Carry a pre-oiled spare for long rides or race weekends for quick mid-day swaps.
  • Inspect the intake tract for dust at each service–if you notice any, increase your cleaning schedule.

Keeping your 2017 Honda CRF450RX air filter in peak condition is one of the most affordable and effective ways to protect your engine and maximize your bike’s power. Find genuine and performance replacement filters, cleaning supplies, and everything else you need at MotoSport.com.

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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.