Air Filter Cleaning – Replacement Guide for 2009 GAS GAS TXT-PRO-300

Shop parts for a 2009 GAS GAS TXT-PRO-300 Dirt Bike.

The 2009 GAS GAS TXT-PRO-300 is a dedicated trials bike built for performance without compromise. Weighing only 66kg and powered by a 294cc liquid-cooled two-stroke engine, this model features precision engineering and a lightweight chassis, making regular air filter maintenance crucial for peak performance and engine longevity.

Why Air Filter Care Matters for Your TXT-PRO-300

  • High-Performance Demands: Trials riding exposes your TXT-PRO-300 to dusty, dirty conditions – a clean filter keeps debris out and air flowing freely.
  • Engine Longevity: The unique reed intake system pulls air directly into the crankcase. Any debris bypassing the filter risks rapid engine wear and costly repairs.
  • Easy Access: The TXT-PRO's airbox is designed for quick access, simplifying filter changes and cleanings with just one bolt securing the filter in place, so you spend less time on maintenance and more time riding.

Steps for Cleaning the Air Filter

  1. Remove the Seat and Access the Airbox:
    • Locate and remove the quick-access bolt securing the seat and airbox cover.
    • Carefully take out the Twin Air filter from the airbox.
  2. Inspect the Filter:
    • Check for tears, hard spots, or serious discoloration. Replace immediately if damaged.
  3. Clean the Filter:
    • Wash the foam air filter in a dedicated air filter cleaner or mild dish soap & warm water. Avoid gasoline or harsh solvents to prevent breakdown of filter material.
    • Gently squeeze out excess liquid (never wring).
    • Rinse thoroughly until water runs clear. Air dry completely before reinstalling.
  4. Re-Oil the Filter:
    • Apply high-quality foam filter oil evenly to every part of the filter, working it in until saturated.
    • Remove excess oil to prevent dripping onto the carburetor or intake.
  5. Inspect the Airbox:
    • Wipe the airbox clean of any residual dirt or old oil, especially around the intake tract.
  6. Reinstall the Filter:
    • Replace the clean, oiled filter, ensuring its proper fit and airtight seal.
    • Reattach the airbox cover and seat securely using the quick access bolt.

When Should You Replace the Air Filter?

  • Every 10–20 Riding Hours: Replace the air filter for peace of mind, especially after heavy riding in extremely dusty conditions or visible damage.
  • After Every Wash: Inspect for breakdown, wear, or loss of foam elasticity.

Important Model-Specific Tips

  • Unique Airbox Design: The 2009 TXT-PRO-300's airbox structure is slim and ergonomic, requiring careful placement of the filter to avoid gaps – improper sealing leads to bypass and engine damage.
  • Pre-Mixed Fuel Compatibility: Always check that oil residue from the filter does not contaminate the crankcase, as this model utilizes a 2.5% pre-mix petrol/oil system, demanding clean air for optimal combustion.
  • Lightweight & Flexible Materials: Ergal engine protector and polypropylene bodywork return to form even after impact, but inspect after maintenance for any airbox warping or cracks that could compromise filter fit.
  • Hydraulic Clutch – No Oil Leaks: While cleaning, double check that hydraulic clutch fluid lines and reservoir are not leaking or interfering with the airbox area.

Proprietary MotoSport Advice

  • Use only premium foam filter oil and Twin Air filters compatible with the TXT-PRO-300 for best protection & fit.
  • Stock up on spare filters – regular changes are cheap insurance for your trials bike and its hard-working engine.
  • Always wear gloves and work in a well-ventilated area during cleaning or replacement procedures.

Proper air filter care on your 2009 GAS GAS TXT-PRO-300 ensures every ride delivers maximum power, responsiveness, and reliability—keeping you at the top of your trials game.

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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.