Air Filter Cleaning – Replacement Guide for 2001 Husqvarna CR125HQ

Shop parts for a 2001 Husqvarna CR125HQ Dirt Bike.

The 2001 Husqvarna CR125HQ features a robust two-stage foam air filter system engineered to intercept larger debris while halting fine dust, silt, and contaminants from entering the engine. Regular air filter care is crucial for maintaining optimal performance & longevity on this high-revving 125cc two-stroke.

Tools – Supplies Needed

  • Gloves to prevent contamination
  • Approved air filter cleaner & oil
  • Clean towel – compressed air (optional)
  • Replacement foam air filter (OEM part #: 800072641)
  • Filter cage – air cleaner case if damaged

Air Filter Removal

  • Ensure the bike is completely cool and placed on a stand.
  • Remove the seat using the rear bolts to access the airbox.
  • Carefully detach the filter cage assembly from the airbox to avoid dropping debris inside.
  • Gently remove the foam filter from the cage, inspecting for tears, excessive dirt, or signs of wear.

Cleaning Procedure

  • Fill a bucket with a dedicated air filter cleaner or mineral-free solvent.
  • Immerse the filter, gently working out all dirt by squeezing – never wringing – to avoid damaging the foam.
  • Rinse thoroughly, ideally using clean water followed by a second clean in fresh cleaner.
  • Let the filter air dry completely – do not use heat as the foam may deform.

Oiling – Inspecting

  • Choose a high-tack foam filter oil, distributing evenly by massaging into all surfaces.
  • Inspect sealing edges and the filter cage for cracks or aging.  Replace if needed.
  • Ensure excess oil is not dripping to avoid fouling the carburetor.

Reinstallation

  • Clean the airbox interior with a moistened towel to remove residual dust.
  • Install the oiled filter onto the cage, verifying contact seals.
  • Reattach the cage into the airbox – confirm a tight fit to prevent leaks.
  • Reinstall the seat.

When to Replace

  • If cleaning no longer restores the foam's integrity, or the filter appears degraded or torn, replace with a new OEM filter (part #: 800072641) for reliable performance.
  • Consider ready-to-use dual-stage foam filters for a faster turnaround – single-use pre-oiled options offer convenience for riders who dislike filter cleaning and maximize airflow while retaining engine protection.

Unique Notes for the 2001 CR125HQ Owner

  • The CR125HQ airbox design is spacious and especially susceptible to water – always ensure the filter and cage maintain a plush seal, particularly after aggressive cleaning or racing in muddy conditions.
  • Dual-stage foam technology supports the CR125HQ's high-strung RPM characteristics, but regular inspection is essential to prevent dust intrusion, which can accelerate engine wear.
  • Replacement intervals may be shorter in sand or fine silt conditions – inspect after every ride for best results.

Maintaining a clean & properly oiled air filter is the simplest way to protect your 2001 Husqvarna CR125HQ and keep it running strong on 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.