Air Filter Cleaning & Replacement Guide for 2020 Honda CRF150RB

Shop parts for a 2020 Honda CRF150RB Dirt Bike.

The 2020 Honda CRF150RB is a purpose-built competition machine with performance and reliability in mind, making proper air filter care critical for optimal engine health and longevity. Regular cleaning and replacement maximizes airflow, protects your engine from abrasive particles, and maintains peak power. Unlike standard street models, the CRF150RB utilizes a dual-stage foam air filter that is engineered to handle harsh off-road conditions and high-rpm demands.

Tools & Supplies Needed

  • New or freshly cleaned air filter (OEM, Twin Air, or equivalent dual-stage foam)
  • Air filter cleaning solvent or dedicated filter cleaner
  • Air filter oil (specifically for foam filters)
  • Clean, lint-free towels
  • Basic hand tools (8mm socket, ratchet, etc.)
  • Disposable gloves

Noteworthy Features for the 2020 CRF150RB

  • The CRF150RB features a dual-layer foam filter, specifically designed for maximum engine protection and high airflow. Quality replacements like Twin Air incorporate a coarse outer foam bonded to finer inner core, optimizing dust trapping and airflow balance.
  • For extreme dust/sand environments, opt for premium dual-stage filters rated 33% thicker than standard, ensuring increased particle retention without restricting power.
  • Proper sealing is crucial: the foam sealing ring must sit flush with the airbox to prevent dirt ingress.

Removal & Inspection

  1. Place the CRF150RB on a stable stand and ensure the engine is cool.
  2. Remove the seat by loosening the seat bolts with an 8mm socket and carefully lifting the seat away.
  3. Access the airbox. Gently separate the air filter from its mounting posttake care not to drop dirt or debris into the intake tract.
  4. Inspect the filter for tears, hardened oil, or excessive staining. Replace if damaged or excessively dirty.

Cleaning Procedure

  1. If reusing the existing filter, gently tap it to dislodge loose debris.
  2. Submerge the filter in a bucket of air filter cleaner or solvent. Work the cleaner through the foam, avoiding twisting or wringing which may damage the adhesive seams.
  3. Rinse thoroughly with clean water. Repeat as needed until all dirt is removed.
  4. Allow the filter to air dry completely, away from direct heat or sunlight.

Oiling the Filter

  1. Apply high-quality air filter oil evenly throughout the filter, ensuring full coverageincluding crevices and seams. The oil should penetrate both layers of foam for maximum protection.
  2. Work the oil in by hand (wear gloves), squeezing gently until the filter is uniformly tacky but not dripping.
  3. Wipe off excess oil, paying particular attention to the sealing surfaces.

Installation

  1. Inspect the airbox for dirt or moisture. Wipe it clean before installation.
  2. Seat the clean, oiled filter onto the mounting post, checking that the foam sealing ring mates snugly with the airbox flange for a dust-tight fit.
  3. Reinstall the seat. Double check proper fastener torque per your owner’s manual.

Service Tips & Frequency

  • Clean and re-oil your air filter at least every 3-5 hours of riding if conditions are dusty or sandy. In clean conditions, extend up to 10 hours, but never longer for racing applications.
  • For the 2020 CRF150RB’s high-performance engine, a clogged or poorly sealed air filter can rapidly accelerate engine wear or lead to costly repairs—always inspect sealing and replace damaged filters per the manufacturer’s specifications.
  • Keep a spare clean/oiled filter to make swaps quick on multi-day rides or race events.

Model-Specific Insight

  • The CRF150RB’s compact airbox design means proper filter fitment is essential—always confirm your filter is specified for the 2020 CRF150RB to prevent leaks and maximize performance.
  • This model is competition-only—special attention to intake sealing and consistent maintenance will keep your engine running strong throughout the racing season.

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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.