Air Filter Cleaning & Replacement Guide for 2018 Honda CRF150R

Shop parts for a 2018 Honda CRF150R Dirt Bike.

Keeping your 2018 Honda CRF150R running at peak performance starts with a clean, well-maintained air filter. The CRF150R uses a dual-stage, high-quality foam air filter engineered for superior filtration and optimal airflow. This unique guide from MotoSport walks you through specific cleaning and replacement steps tailored exclusively for your model and showcases features every owner should know about this youth motocross machine.

Why Clean & Replace Your CRF150R Air Filter Regularly?

  • Dual-stage foam designs trap both large particles and fine dust, essential for effective engine protection in harsh off-road conditions.
  • A clogged or dirty filter restricts airflow, reducing power and risking engine wear.
  • A clean filter ensures your CRF150R gets the air it needs for stronger throttle response and reliable starts.

What You Need

  • Quality foam air filter (compatible with 2018 Honda CRF150R)
  • Filter-specific cleaning solution
  • Air filter oil (foam-type)
  • Clean shop towels
  • Gloves (optional, for handling oils and cleaning fluids)

Air Filter Removal Process

  • Remove your seat using the quick-release mechanism or bolts, depending on your setup.
  • Carefully loosen and remove the filter cage wingnut. Gently pull the filter and cage out of the airbox.
  • Caution: Take care not to let any loose dirt fall into the open intake. Stuff a clean shop towel into the air boot immediately upon filter removal.

Cleaning Instructions

  • Remove the foam filter from its cage gently to avoid tearing the foam or damaging glue seams.
  • Soak the filter in a designated foam filter cleaner or a mild, biodegradable detergent. Avoid gasoline or strong solvents to preserve filter adhesiveness and foam structure.
  • Gently massage and squeeze out dirt (do not twist or wring).
  • Rinse thoroughly with clean water until no dirt or detergent remains.
  • Allow the filter to dry completely in a well-ventilated areamoisture can damage your engine.

Oiling & Reinstallation

  • Once dry, apply foam-specific air filter oil evenlyensure full saturation, but avoid excess dripping.
  • Work the oil into all areas of the filter by massaging it with your hands (wear gloves).
  • Inspect the filter for tears, split seams, or hardened foam. Replace if damaged.
  • Remount the filter onto its cage, ensuring the sealing ring is unbroken and free from debris. The CRF150R uses a thick, flat foam sealing ring for total airbox contact and superior sealing.
  • Install the assembled filter and cage back into the airbox. Secure the wingnut firmly, but do not overtighten.
  • Remove the shop towel from the air boot before closing the airbox and reinstalling the seat.

Replacement & Maintenance Tips

  • Inspect and clean after every ride in heavy dust or sand; at minimum, check after every 2-3 rides on standard trails.
  • Have a spare pre-oiled filter on hand for race days or quick changesplush sealing and pre-oiled options simplify maintenance.
  • The 2018 CRF150R's open-pore foam design (often 45/65 PPI dual-layer) offers maximum protection against dirt and debris. Dual-stage filters (like Twin Air) are ideal for both performance and longevity.

Noteworthy Model-Specific Details

  • The 2018 CRF150R is engineered for high-revving, competitive performanceairflow is critical for consistent power delivery.
  • Careful maintenance of the air filter extends piston and valve life, which are known wear areas on this four-stroke race bike.
  • Always use a filter designed for the 2007-2025 CRF150R platform for proper fitment and optimal airbox seal.

Keep your 2018 Honda CRF150R at its best with routine air filter maintenanceprotect your investment and enjoy peak power with 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.