Air Filter Cleaning – Replacement Guide for the 2021 Honda CRF110F

Shop parts for a 2021 Honda CRF110F Dirt Bike.

The 2021 Honda CRF110F is lightweight, beginner-friendly, and renowned for its reliability & user-friendly maintenance. A clean, properly maintained air filter is crucial for this model’s performance & engine longevity. This essential guide by MotoSport will walk you through the unique details and best practices for the air filter used on your CRF110F.

Understanding Your CRF110F Air Filter

The 2021 CRF110F uses a dual stage open-pore foam air filter. This design features a coarse outer foam that traps larger dirt and debris, and a fine inner foam that catches smaller particles while maintaining optimal airflow. Factory and aftermarket filters are flame-laminated and use proprietary adhesives for durability, vital for off-road riding demands–the outer and inner layers are fused to prevent contaminants getting trapped between layers–.

When to Clean or Replace the Air Filter

  • Inspect after every ride in dusty conditions, or every 2-3 rides in light conditions.
  • Replace the filter if there are tears, stiff spots, or if dirt/oil do not fully wash out.
  • The OEM part number for the CRF110F air filter element is: 17211-KYK-D10.

Step-by-Step: Removing the CRF110F Air Filter

  1. Locate the airbox on the left side beneath the seat. Remove the seat via the rear bolts.
  2. Release the airbox cover clips and remove the cover.
  3. Gently slide out the filter retainer and air filter element. Take note of the filter orientation for reassembly.

Cleaning & Re-Oiling the Filter

  1. Tap the filter gently to remove loose debris. Avoid twisting or squeezing aggressively—foam is durable but can tear.
  2. Submerge the filter in a mild, foam filter-specific cleaner solution. Massage gently by hand.
  3. Rinse thoroughly with clean water until all dirt and soap are gone.
  4. Gently press out excess water. Allow the filter to air dry completely before applying oil.
  5. Apply foam filter oil evenly, working it in thoroughly to all areas. Avoid heavy oversaturation, which can restrict airflow.

Replacing or Upgrading the Air Filter

  • For best results, choose a high-quality dual-stage foam filter. Performance filter options offer increased airflow and include a honeycomb base design that improves throttle response—a notable upgrade for the CRF110F.
  • Replace the backfire screen as needed, as damage can impact both filter performance and engine protection.

Reinstallation Tips

  1. Ensure the sealing lip of the filter aligns perfectly with the airbox edge. Improper seating may allow dust past the filter.
  2. Double-check the airbox seal and cover for any debris before securing the cover back in place.
  3. Replace the seat and confirm all fasteners are snug.

2021 CRF110F Model Notes & Maintenance Insights

  • No tools required for air filter access—making regular inspection straightforward for all skill levels.
  • The CRF110F air filter is designed to maximize air flow for the smaller engine, which makes regular cleaning more important for consistent power delivery.
  • If you often ride in muddy or sandy conditions, consider having a spare pre-oiled filter for faster swaps.
  • Always check the airbox seal and ducting for dirt or water before reinstalling to prevent engine wear.

MotoSport makes it easy to keep your 2021 Honda CRF110F in top shape with a full selection of factory and performance air filters, oil, and all essential maintenance parts.

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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.