Air Filter Cleaning – Replacement Guide for 2023 GAS GAS EX300

Shop parts for a 2023 GAS GAS EX300 Dirt Bike.

Keeping the air filter of your 2023 GAS GAS EX300 clean and properly serviced is essential for reliable performance and engine longevity. The EX300’s 2-stroke engine is highly sensitive to dirt and debris, relying on a well-maintained air filter to keep contaminants out of the combustion chamber. This guide by MotoSport.com focuses on easy-to-follow, model-specific tips to ensure your air filter always provides optimal protection for your ride.

When To Clean or Replace Your EX300 Air Filter

  • Every ride: Inspect the air filter if you’ve ridden in dusty or wet conditions or after longer rides across loose terrain.
  • Every 5–10 hours: As part of scheduled maintenance, clean the air filter every 5 to 10 hours, or immediately if it looks dirty.
  • Replace: Swap out the filter when it shows tears, permanent staining, or cannot be properly cleaned.

What Sets the 2023 GAS GAS EX300 Air Filter Apart

  • Quick-access design: The 2023 EX300 features a tool-less, side panel airbox access – designed for fast removal and installation, unique to this model line.
  • Oversized air filter: The generous surface area promotes airflow while trapping more dust, important given the EX300’s high-revving 2-stroke characteristics.

Required Supplies

  • Model-specific air filter (OEM or quality aftermarket)
  • Filter cleaning solution (foam air filter specific)
  • Foam air filter oil
  • Rags – gloves
  • Plastic bag (for oil application)
  • Water (preferably warm)
  • Filter grease (optional, for sealing rim)

Air Filter Removal

  • Switch off the ignition and ensure the bike is on a stable stand.
  • Use the quick-release side panel to access the airbox – GAS GAS designed this for ultra-convenient filter swaps, requiring no tools.
  • Carefully extract the air filter cage assembly to avoid knocking debris into the airboot.
  • Inspect the airboot for any dirt. Wipe clean with a damp rag if necessary before installing a clean filter.

Cleaning the Filter

  • Tap the filter gently to remove loose dirt.
  • Submerge in air filter cleaner or a specifically designed degreaser. Avoid gasoline or harsh solvents.
  • Work the cleaner through the foam, rinse thoroughly with warm water until all dirt and cleaner are gone.
  • Squeeze (do not wring) to avoid tearing the foam or breaking the glue seams.
  • Allow the filter to air dry completely – never use compressed air or high heat, as it can degrade the foam.

Oiling the Filter

  • Once dry, apply foam air filter oil evenly. Place the filter in a plastic bag to massage the oil throughout for full coverage.
  • Ensure no dry spots remain – insufficiently oiled areas can let fine dust pass through.
  • Apply a thin bead of filter grease around the sealing rim for maximum dust protection (optional, recommended in very dusty conditions).

Installation

  • Mount the clean filter back onto its cage. Double-check that the filter edge seals completely across the airbox lip.
  • Reinstall the assembly securely and refit the side panel until it clicks.

Additional EX300 Owner Tips

  • The EX300’s 2-stroke engine is less tolerant of dirty intakes – never skip filter cleaning if conditions are dusty or muddy.
  • The airbox is designed for easy cleaning. Consider plugging the intake tract if you plan to wash the bike, to prevent water intrusion while the filter is out.
  • Rotate between spare filters to reduce downtime and make maintenance easier.

Keeping your 2023 GAS GAS EX300’s air filter maintained with these MotoSport.com best practices ensures peak engine health and maximum enjoyment 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.