Air Filter Cleaning & Replacement Guide for 2022 GAS GAS EX300

Shop parts for a 2022 GAS GAS EX300 Dirt Bike.

If you own a 2022 GAS GAS EX300, keeping the air filter clean & well-maintained is critical for optimal engine performance and longevity. GAS GAS two-stroke engines, especially the EX300, are highly dependent on a clean, unobstructed filter to prevent dust, dirt, and debris from damaging the cylinder & piston during aggressive off-road use. Below is MotoSport's proprietary step-by-step guide tailored for your bike's unique configuration and use-case.

Required Supplies

  • OEM or performance air filter
  • Air filter cleaner (solvent, degreaser, or filter-specific spray)
  • Air filter oil (foam-style for EX300)
  • Lint-free towels & gloves
  • Small brush (optional)
  • Replacement filter (if needed)

Removing the Air Filter

  • Place your EX300 on a stable stand and remove the seat by releasing the rear seat fastener – the seat pulls off to reveal the airbox.
  • Locate the air filter inside the airbox, held by a central retaining screw or locking tab (depending on build month). Unscrew or release the fastener and carefully pull out the filter, avoiding dropping debris into the intake.

Inspecting and Cleaning

  • Visually inspect the filter. If it is torn, excessively stained, or stiff, replace it. Otherwise, proceed with cleaning.
  • Gently tap the filter to remove loose dirt. Apply the air filter cleaner over the surface, working it in by hand.
  • Let the cleaning solution soak for several minutes, then rinse the filter with clean water until residue is gone.
  • Squeezedo not twistthe filter to avoid damaging the foam. Lay it flat on a clean towel and allow thorough drying.

Oiling and Reinstallation

  • Once dry, apply air filter oil evenly across the foam. Massage oil through the material so coverage is consistent, but avoid over-saturation to prevent airflow restriction.
  • Double-check for any missed areas or gaps in oiling.
  • Reinstall the air filter in the airbox, aligning the sealing edge precisely. Secure with the original fastener, ensuring an airtight fit to stop dust bypass.
  • Replace the seat and confirm all fastenings are tight and flush.

Replacement Interval & Model-Specific Tips

  • For the EX300, under typical off-road conditions, inspect & clean the air filter every ride. Replace the filter at least every season, or immediately if severely contaminated or after riding in fine dust or mud.
  • The 2022 EX300 uses a generous, high-capacity airbox designed for rapid removal. Be sure the filter edge is fully seated against the airbox moldany small gap can let in particles that cause top-end wear.
  • Bikes equipped with a 2-stroke oil tank (like the EX300) may show oily mist inside the airboxa sign of positive crankcase ventilation and normal operation, but excessive buildup is a cue to clean the filter more often.
  • Use only foam-style oils and filters recommended for premix or injected two-strokes. Other styles may reduce airflow and power, or fail to trap dirt effectively.

Notes for 2022 GAS GAS EX300 Owners

  • The EX300's lightweight airbox cover can be loosened by vibration; regularly inspect the mounting points for tightness and ensure the seal is intact.
  • If your bike uses aftermarket parts, such as vented airbox covers or high-flow filters, service intervals may need to be shortened to match increased exposure.

Regular air filter care is among the most crucial tasks for the 2022 GAS GAS EX300 owner. With MotoSport's exclusive guide, you can preserve your engine's performance for every ride—no matter how dusty or demanding the trail.

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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.