Air Filter Cleaning – Replacement Guide for 2011 Husqvarna WR300

Shop parts for a 2011 Husqvarna WR300 Dirt Bike.

The 2011 Husqvarna WR300 is equipped with a high-performance, dual-layer polyurethane foam air filter, specifically engineered for optimal filtration and airflow through the unique intake system of the WR300. Keeping your air filter clean & replacing it when necessary is vital for engine longevity, top power output, – and a trouble-free riding experience.

Important Considerations for the WR300

  • OEM fit: The WR300's air filter is designed to fit snugly in the factory air box — always use a filter made specifically for the 2011 model for a proper seal.
  • Dual layer design: The open-cell polyurethane construction and dual foam layers trap dirt efficiently while maintaining high airflow, which is crucial on the WR300 for consistent throttle response.
  • Maintenance sensitivity: Because the WR300 is a high-strung two-stroke, an obstructed air filter can quickly bog performance or lead to costly engine damage.

Air Filter Cleaning – Step-by-Step Instructions

  1. Remove the seat by unlocking the rear latch and lifting off.
  2. Unclip & remove the air filter cover to access the filter.
  3. Carefully take out the air filter, noting its orientation for reinstallation.
  4. Inspect for major damage:
    • If torn or excessively dirty, replace with a direct OEM-fit foam filter specifically for WR300.
    • If intact, proceed to clean.
  5. Clean with a dedicated filter cleaner:
    • Gently massage the cleaner into the foam.
    • Rinse thoroughly with water – never use gasoline or compressed air, as these degrade foam integrity.
    • Squeeze out excess water and allow to air dry fully.
  6. Re-oil the filter using a recommended foam filter oil:
    • Work oil evenly through the filter until uniformly colored but not dripping.
  7. Reinstall filter into air box ensuring a complete seal. Secure the air filter cover and replace the seat.

Replacement Air Filter Notes

  • Use only filters designed for the 2011 WR300 for perfect fit — common options include Athena, Twin Air, and Hiflofiltro.
  • Replace immediately if foam begins to degrade, or at intervals recommended in your owner's manual if you ride in extreme conditions.
  • Filters constructed with dual-layer open-cell polyurethane provide superior performance for the WR300.

WR300 Model-Specific Advice

  • The WR300's airbox design and high output require a perfectly sealed filter — always ensure the filter edge mates flush with the airbox surface.
  • Poor sealing or the use of generic aftermarket filters may let dust and debris past, risking rapid engine wear.
  • Frequent filter checks are especially critical for the WR300 when riding in dusty or muddy conditions to prevent power loss and cylinder scoring.

Following these MotoSport-exclusive proper cleaning – replacement procedures will keep your 2011 Husqvarna WR300 running crisp, powerful, and protected on every ride.

Related Shopping Categories

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Shop Intake Parts for a 2011 Husqvarna WR300 Dirt Bike.

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.