Air Filter Cleaning – Replacement Guide for 2021 Honda CRF450RWE

Shop parts for a 2021 Honda CRF450RWE Dirt Bike.

The 2021 Honda CRF450RWE is a premium Works Edition dirt bike equipped for factory-level performance. One critical maintenance task for ensuring the power, longevity, and reliability of your machine is proper air filter care. This MotoSport-exclusive guide covers everything you need to know to clean and replace the air filter on your CRF450RWE—with tips specific to the model's advanced features.

Why Air Filter Maintenance Matters

Your CRF450RWE's 449cc engine demands optimal airflow for peak performance. A clogged or damaged air filter restricts airflow, leading to reduced engine output and increased risk of dirt ingress, which can cause pricey damage. The 2021 Works Edition uses a Twin Air filter: a dual-stage foam unit engineered for high filtration and airflow, and recognized for its performance in factory-level equipment.*

Tools & Supplies Needed

  • Clean gloves
  • Air filter cleaning tub or bucket
  • Air filter-specific cleaning solution
  • Fresh water
  • Air filter oil
  • Lint-free towels
  • Replacement air filter (Twin Air part #150230 or OEM Honda 17213-)

Proprietary Cleaning Process for MotoSport Customers

  1. Remove the seat: Use a 10mm socket to take off the seat bolt. Lift off the seat, exposing the air filter box.
  2. Remove the filter: Undo the airbox filter bolt and carefully pull out the filter. Inspect for tears, dry rot, or excessive contamination before proceeding.
  3. Clean the airbox: Wipe the airbox and flange area with a damp lint-free towel. Avoid letting dirt fall into the intake tract.
  4. Wash the filter: Submerge the filter in approved cleaning solution—use gentle squeezing, never wringing or harsh twisting. Rinse with clean water until solution runs clear. Repeat if filter is heavily soiled.
  5. Dry completely: Air dry the filter away from direct sunlight and heat sources. Refrain from re-installing a damp filter—moisture invites engine damage.
  6. Oil the filter: Pour or spray filter oil on the foam, working it thoroughly into both layers. The Works Edition's Twin Air design requires full saturation for proper filtration—pay attention to seams and corners.
  7. Reinstall the filter: Align with the airbox's sealing ring for a precise, airtight fit. Fasten the filter bolt, then confirm there are no visible gaps.
  8. Reinstall the seat: Secure seat, checking for proper fit.

Replacement Guidelines

  • Inspect air filter after every ride in sandy, dusty, or wet conditions.
  • Replace the filter if foam is torn, thinned, or glue seams lose integrity—Twin Air's fused foam should always feel solid.
  • Always replace with a compatible high-flow foam filter to retain performance advantages of the CRF450RWE.

Special Model Notes

  • The 2021 CRF450RWE features factory Twin Air filtration, which is double-layer foam and flame laminated for superior filtering and airflow. Check for exclusive adhesive seals—failure to maintain a tight seal can compromise the engine.
  • Access is made easier thanks to Honda's redesigned bodywork.
  • Regular filter maintenance preserves the performance benefits of the Works Edition's ported engine and premium exhaust.
  • The OEM filter part number for this bike is Honda 17213-, and Twin Air's aftermarket part is #150230.*

MotoSport recommends updating your riding and maintenance schedule with frequent air filter checks, especially if your CRF450RWE is used in competitive or extreme environments. This preserves the Works Edition's distinct power, throttle response, and value.

*Source: 2021 Honda CRF450RWE specifications and product details. Air filter cleaning steps and notes are proprietary to MotoSport.com. Twin Air and Honda OEM compatibility referenced .

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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.