Air Filter Cleaning – Replacement Guide for 1995 Honda CR125

Shop parts for a 1995 Honda CR125 Dirt Bike.

The 1995 Honda CR125 is a legendary motocross bike known for its agile handling and sharp two-stroke engine character. Keeping its air filter clean and well-maintained is essential for performance, throttle response, and engine longevity. The OEM air filter design for the CR125 from this era uses a dual-stage foam construction, which is both washable and reusable—a perfect fit for riders seeking both performance and value.

Why Regular Air Filter Maintenance Matters

Dirt, dust, and debris are the sworn enemies of any two-stroke, especially on a classic like the CR125. If the air filter is neglected, fine grit can quickly damage the engine internals and lead to costly repairs. Proper filter care ensures unobstructed airflow, preserving the signature snap and rpm response this bike is known for.

Tools & Supplies Needed

  • Replacement air filter or high-quality foam filter oil and cleaner
  • Clean rags and latex gloves
  • Plastic bag (for oiling the filter)
  • Small screwdriver and 8mm socket or T-handle wrench

Removal of Air Filter

  1. Ensure the bike is clean, then remove the seat—typically secured by two 8mm bolts on each side at the rear subframe.
  2. Locate the airbox and loosen the wingnut (center of the filter cage) to release the filter and cage assembly.
  3. Gently pull the foam filter away from the cage, taking note of any tight fit around the bottom lip.

Cleaning the Air Filter

  1. Gently tap the filter to dislodge any loose dirt. Do not twist or wring excessively, as this can tear the foam.
  2. Immerse the filter in a bucket of designated air filter cleaner or mild dish soap with warm water. Work the solution through the foam by hand.
  3. Rinse thoroughly under running water until all traces of dirt and oil are gone. Squeeze (never twist) to dry out excess water.
  4. Let air-dry completely before oiling. Never use compressed air or high heat sources, which degrade the foam and glue seams.

Oiling & Reinstalling the Air Filter

  1. Once dry, pour a dedicated foam air filter oil (not motor oil) over the filter. Place the filter inside a plastic bag and fully massage the oil into the foam, ensuring an even coating throughout.
  2. Remove the filter and squeeze out any excess oil. The filter should be thoroughly coated but not dripping.
  3. Inspect the filter cage for damage or residual debris, clean if necessary.
  4. Reinstall the filter over the cage, making sure it forms a full seal around the base.
  5. Fasten the assembly back into the airbox using the filter wingnut. Double-check the filter is correctly seated to prevent any unfiltered air gaps.
  6. Reinstall the seat, securing it tightly with all proper hardware.

Replacement – When Should You Swap Filters?

A quality OEM-style foam filter can be cleaned and reused many times. However, replacement is advised if you notice:

  • Tears, thin spots, or damaged seams
  • Persistent dirt even after repeated cleanings
  • Age-related hardening or crumbling of the foam

For the 1995 CR125, many aftermarket manufacturers still offer direct-fit dual- and triple-stage foam filters, making replacement straightforward. Routine inspection after every dusty or muddy ride is recommended for optimal results.

Specific Tips for the 1995 Honda CR125 Owner

  • The CR125's airbox design allows some splash infiltration on muddy rides. Take special care to create a grease seal along the base lip for maximum protection.
  • The filter element and cage from 1990’s Honda models (1990-1999) are generally compatible, making finding spares or upgrades easier than many vintage bikes.
  • If power feels inconsistent or "boggy," a clogged air filter is often the culprit—always inspect it after particularly dusty events.

Keep your classic two-stroke healthy with regular air filter care, and it will reward you with that signature CR125 punch lap after lap—every ride, every 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.