Air Filter Cleaning & Replacement Guide for 2019 GAS GAS TXT-Racing-280

Shop parts for a 2019 GAS GAS TXT-Racing-280 Dirt Bike.

The 2019 GAS GAS TXT-Racing-280 is engineered for precision and agility in trials riding, relying on a well-maintained air filtration system for peak performance. Neglecting the air filter exposes the high-revving two-stroke engine to dirt and debris, risking rapid wear and loss of power. This MotoSport proprietary guide will help you clean and replace the air filter correctly while signaling important model-specific notes.

Required Tools & Supplies

  • Replacement air filter (Twin Air or Jitsie – dual-layer foam designs are recommended for superior filtration and airflow)
  • Air filter cleaning solvent (or mild dish soap)
  • Air filter oil (specifically formulated for foam filters)
  • Latex or nitrile gloves
  • Clean, lint-free towels
  • Small brush for cleaning airbox

Step-by-Step Cleaning and Replacement Instructions

  1. Preparation:
    • Place the bike on a stand or secure surface to keep it upright.
    • Ensure the engine is cold to avoid burns and accidental contamination.
  2. Remove the Seat and Airbox Cover:
    • Undo any fasteners (Phillips/flathead or 8mm bolts) holding the seat and airbox cover.
    • Carefully lift the seat and remove the airbox cover to access the filter.
  3. Extract the Air Filter:
    • Note how the filter is seated. Gently pull it out, watching for loose dirt.
    • Inspect the filter; if heavily soiled, damaged, or misshaped, replace it with a fresh dual-layer foam filter (OEM Twin Air recommended for this model).
  4. Clean the Airbox:
    • Use a clean towel or brush to remove any dirt/grit from the airbox interior.
    • Ensure the filter seat and airbox seals are intact and fitted snugly – GAS GAS TXT airboxes are known for tight tolerances.
  5. Wash the Filter:
    • Submerge the foam filter in cleaning solvent or warm, soapy water.
    • Gently knead (never wring) until dirt and oil are cleared.
    • Rinse thoroughly; allow to air dry completely.
  6. Oil the Filter:
    • Pour air filter oil along the foam and massage to distribute evenly. Coverage is critical for trapping fine dust and sand.
    • A void in coverage means your engine loses protection; over-oiling may restrict airflow but does provide enhanced debris trapping.
    • Allow excess oil to drip off before reinstalling.
  7. Reinstall the Filter:
    • Reset the air filter, ensuring it seals flush against the airbox mating surface. Inspect the gasket and sealing edges; GAS GAS uses a thick, flat sealing ring for full contact.
    • Secure all fasteners – avoid overtightening, which can distort the filter and cause leaks.
    • Return the airbox cover and seat securely.

Recommended Cleaning & Replacement Intervals

  • Clean the air filter after every ride in dusty, sandy, or wet conditions; otherwise, every 10 hours of riding is suitable for normal use.
  • Replace the air filter if torn, collapsed, or degraded – always keep a spare for competition.

Owner Notes: Unique Features & Cautions

  • The 2019 TXT-Racing-280 requires the air filter to seat perfectly for maximum protection due to the model's narrow airbox design – inspect for any dust bypass after every cleaning to ensure the seal is uncompromised.
  • Shallow filter placement in this model means over-oiling or missing the sealing lip can result in poor throttle response due to airflow restriction.
  • Twin Air and Jitsie foam filters (OEM spec) feature a dual-stage system: the coarse outer foam traps larger particles; the fine inner foam stops micro-particles.
  • Never use paper filters – only bonded dual-layer foam types provide the durability and performance required for aggressive trials riding.
  • Always verify the air filter matches TXT model dimensions (Pro/GP/Racing 280 compatibility 2002–2022).

Pro Tips from MotoSport

  • Keep a resealable bag with a pre-oiled spare filter – quick field swaps save your ride on event days.
  • Check intake boots/clamps for dust or wear when cleaning the filter; a leaky boot can allow dirt past even a fresh filter.
  • Record service intervals and inspect sealing rings annually for compression set or degradation.

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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.