Air Filter Cleaning – Replacement Guide for 2018 GAS GAS TXT-GP-250

Shop parts for a 2018 GAS GAS TXT-GP-250 Dirt Bike.

The 2018 GAS GAS TXT-GP-250 is distinct among trials bikes for its lightweight frame, responsive engine, and competition-ready parts package. Keeping the air filter clean and properly serviced is critical to maintaining peak performance and extending the longevity of this specialized engine. Below, MotoSport provides a proprietary step-by-step guide focused on your exact model.

Why Air Filter Maintenance Matters

Your TXT-GP-250 is engineered for off-road agility, and its air filter is the first (and main) line of defense against dust, mud, and debris drawn into the engine. A clogged or poorly sealed filter will allow contaminants in, causing premature engine wear or costly repairs.

Air Filter Cleaning - Step by Step

  • Lift the Seat – Remove Side Panels: With the bike secure and off, unclip or remove the seat and the needed side panel fastenings.
  • Remove Air Filter Box Cover: On the TXT-GP-250, release the fasteners on the airbox cover. Carefully lift away the cover to access the air filter.
  • Extract the Air Filter: Gently remove the air filter, noting the fitment for proper realignment at reinstallation. Inspect for major tears or signs of deterioration.
  • Clean the Air Filter: Use a dedicated foam filter cleaner. Soak, squeeze, and rinse until oil and debris are fully flushed, then let the filter air-dry completely. Avoid twisting/wringing to maintain filter shape integrity.
  • Clean the Airbox: While the filter dries, wipe out the inside of the airbox with a lightly damp rag. Keep debris out of the throttle body or intake tract.
  • Re-oil the Filter: Once dry, apply high-quality foam air filter oil. Work it thoroughly and evenly - the entire filter surface should be sticky but not dripping.
  • Reinstall the Air Filter: Insert the freshly oiled filter, ensuring an even seal around the filter base. The TXT-GP-250 relies on a dust-tight seal to protect against the tiny, abrasive particulates typical in trials and off-road use.
  • Install the Air Filter Box Cover and Panels: Replace the air filter box cover and side panels, making sure no wiring or hoses are pinched. Confirm the seat is locked in place before riding.

When to Replace vs. Clean

Replace the air filter if it has any rips, severe deformation, or permanent stains that do not wash out. For most owners, cleaning after every 2-3 rides is recommended, but replace at least once or twice a season, or sooner in dusty or wet conditions.

Special Notes – For 2018 GAS GAS TXT-GP-250 Owners

  • The stock air filter is a large-capacity foam style exclusive to this model year. Always match replacement size and shape closely for proper fit.
  • Avoid starting the engine with the air filter removed, as sensitive components could ingest dust immediately.
  • Use only air filter oils approved for foam filters. Petroleum-based motor oils may break down foam and reduce filtration.
  • Check for other blocked intake points or pinched vent hoses before closing up the airbox.
  • Keep a record of each cleaning or replacement session - especially if riding in muddy trials or exceptionally dusty environments.
  • The 2018 TXT-GP-250 uses a rubber gasket to seal the air filter base. Inspect this regularly for cracks and replace as needed to maintain optimal sealing.

Routine air filter care is foundational maintenance for your high-performing GAS GAS TXT-GP-250. Continue to rely on MotoSport.com for parts, tips, and model-specific expertise to keep your ride responsive and ready.

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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.