Air Filter Cleaning – Replacement Guide for 2019 GAS GAS TXT Racing 125

Shop parts for a 2019 GAS GAS TXT Racing 125 Dirt Bike.

The 2019 GAS GAS TXT Racing 125 is regarded for its precision handling and durable two-stroke engine. Keeping the air filter in top shape is critical to the bike's performance and engine longevity, especially in the demanding conditions trial bikes encounter. This guide by MotoSport gives you a comprehensive walkthrough for cleaning and replacing your TXT Racing 125 air filter.

Why Air Filter Maintenance Matters for the TXT Racing 125

This model employs a dual-layer foam air filter designed to trap dust, sand, and debris while maintaining optimal airflow. Regular maintenance prevents abrasive particles from damaging the engine’s internals, ensuring consistent power delivery and throttle response. The TXT Racing 125’s airbox is positioned to maximize protection yet still allows for straightforward access, making routine filter care simple for every rider.

Tools – Supplies You'll Need

  • Latex or nitrile gloves
  • Foam air filter cleaner (avoid gasoline – only use cleaners formulated for foam filters)
  • Bucket or wash basin
  • Clean water
  • Soft brush (optional)
  • Foam air filter oil (specific for off-road use)
  • Clean, lint-free rags
  • OEM or quality aftermarket replacement air filter as needed

Removing the Air Filter

  1. Ensure the bike is clean around the airbox to avoid knocking dirt into the intake.
  2. Remove the seat and the side panel (if necessary) to access the airbox.
  3. Release the filter retainer wire, gently slide out the filter element, and inspect for damage or excessive dirt.
  4. Stuff a clean rag into the intake while the filter is removed to prevent accidental contamination.

Cleaning Instructions

  1. Rinse the filter gently with warm water to remove excess debris.
  2. Apply air filter-specific cleaner thoroughly and let it soak as directed by the cleaner’s instructions (generally 10–15 minutes).
  3. Massage the filter gently – do not twist or wring, as this could tear the foam.
  4. Rinse repeatedly until all cleaning residue is gone.
  5. Squeeze out excess water and let the filter air dry completely (do not use heat).

Oiling the Filter

  1. Once fully dry, apply foam filter oil evenly to all surfaces, massaging it in for total coverage.
  2. Filter must be fully oiled (but not dripping) – a slightly tacky feel is ideal.
  3. Wipe off any oil from the sealing edges and inspect for uniform coverage.

Installing the Air Filter

  1. Remove rag protecting the intake.
  2. Check filter for rips, tears, or hard spots. If present, replace with a new filter designed for GAS GAS TXT Racing 125 (Twin Air or OEM spec foam filter is recommended).
  3. Position the filter securely, ensuring a complete seal around the airbox rim to prevent unfiltered air leaks.
  4. Reattach filter retainer, then reinstall panel and seat securely.

Replacement Recommendations

  • Visually inspect your air filter every 3–5 rides in dry conditions, or every ride in wet, muddy, or dusty terrain.
  • Replace the filter if there is any damage, hardened foam, or persistent staining even after proper cleaning.
  • Filters for the 2019 GAS GAS TXT Racing 125 are readily available as OEM or Twin Air foam products compatible with TXT models up to 2022.

Key Model-Specific Tips

  • Secure the air filter evenly on all sides–a misaligned or pinched seal can invite dirt into the intake and cause premature engine wear.
  • If the filter cage or frame shows signs of warping or deformity, replace these components to ensure the filter maintains a tight fit.
  • Proper air filter care is especially crucial on the TXT Racing 125 since the small-bore engine needs clean, unrestricted air to deliver sharp throttle response typical of trials competition machines.

Consistent air filter maintenance is one of the simplest yet most effective ways to protect your GAS GAS TXT Racing 125’s engine and ensure peak performance with 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.