Air Filter Cleaning & Replacement Guide for 2020 Honda CRF125F
Shop parts for a 2020 Honda CRF125F Dirt Bike.
Regular maintenance of your 2020 Honda CRF125F air filter is critical for protecting your engine, optimizing performance, and prolonging engine life. Off-road conditions accelerate debris accumulation, so cleaning or replacing the air filter is a key routine for every CRF125F owner. Below you'll find a MotoSport-proprietary step-by-step procedure, tailored for this particular model, along with details unique to the 2020 Honda CRF125F.
Why Air Filter Maintenance Matters for Your CRF125F
- Engine Protection: The air filter keeps dust, sand, and debris out of your engine, preventing premature wear and costly repairs.
- Performance: Clean airflow supports strong engine output and throttle response. A neglected filter results in poor performance, low fuel efficiency, and potential spark plug fouling.
- Customization: The 2020 CRF125F uses a dual-stage foam filter, specifically engineered for off-road use, offering optimal balance between filtration and air flow.
Preparation & Tools Needed
- New or clean air filter (Honda Genuine or equal quality foam type)
- Air filter oil (for foam filters)
- Mild, non-petroleum cleaner (for reusable filters)
- Latex/nitrile gloves
- Towel or workspace cover
Removal of Air Filter (2020 CRF125F)
- Ensure the bike is cool and parked on a stable surface.
- Remove the left side cover to access the air box.
- Unlatch the retainer clips securing the air cleaner housing cover, then remove the cover.
- Unhook the set spring. Avoid bending the set spring and set spring holder.
- Carefully pull out the air filter.
Cleaning the Air Filter
- If reusing, submerge the filter in a mild detergent solution, gently squeeze to remove dirt. Do not twist, which could tear the foam.
- Rinse with clean water and gently squeeze out moisture.
- Allow the filter to air dry completely—do not use compressed air or heat sources.
- Once dry, apply air filter oil evenly (for foam types), massaging oil through all surfaces.
Installing a New or Clean Filter in the CRF125F
- Ensure the air box and surrounding surfaces are free from debris.
- Insert the clean, oiled air filter in the correct orientation.
- Reattach the set spring and verify the set spring holder is properly aligned.
- Secure the air filter housing cover, fastening all retainer clips.
- Reinstall the left side cover.
Model-Specific Notes for 2020 CRF125F Owners
- The CRF125F features a dual-stage foam filter, offering two different pore sizes for superior dust and particle trapping while maintaining airflow.
- The air filter may become contaminated with engine oil if the drain tube overflows – check and drain as needed to prevent performance issues.
- Always replace with a filter specifically designed for the 2020 CRF125F. Using incorrect filters may lead to poor fitment and increased engine wear.
- Service intervals should be shortened in dusty, muddy, or wet riding environments for best engine protection.
Pro Tips
- Keep a spare, pre-oiled air filter on hand for quick swaps between rides.
- If you use aftermarket performance air filters, ensure they meet or exceed OEM filtration standards for the CRF125F.
- Reticulated, flame-laminated foam options are available for higher durability and dirt-trapping efficiency.
Proper air filter care is simple and pays off with every ride. Follow this MotoSport cleaning and replacement guide after each ride in challenging conditions, or according to your owner's manual for regular intervals, to keep your 2020 Honda CRF125F running strong.
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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.
