How to Change the Coolant in a 2009 GAS GAS TXT PRO 300

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Keeping the cooling system in top shape is essential for your 2009 GAS GAS TXT PRO 300’s performance and longevity, especially during challenging trials riding. Below is a proprietary MotoSport guide on how to properly change the coolant in your TXT PRO 300, highlighting model-specific precautions and technical insights.

Important Safety Precautions

  • Always allow the engine to cool before removing the radiator cap to prevent severe burns or scalding.
  • Wear gloves and eye protection. If coolant contacts your skin or eyes, flush immediately with water.

Tools – What You Need

  • Socket wrench or Allen wrench (depending on drain bolt type)
  • Drain pan
  • Fresh coolant suitable for aluminum radiators
  • Funnel
  • Clean rags

Step-by-Step: Changing the Coolant

  1. Locate the radiator cap.
    Remove the radiator shroud if needed for easier access.
  2. Ensure the motor is cold.
    The pressurized system can spray hot coolant if opened when hot.
  3. Remove the radiator cap slowly to relieve any residual pressure.
  4. Position a drain pan beneath the engine.
    Identify the coolant drain bolt/cap on the lower left-hand side of the crankcase. This design allows easy draining.
  5. Unscrew the drain bolt.
    The early engines use a standard Allen head; later 2009s may require a T-25 Torx bit for a brass drain/shaft bushing.
  6. Allow coolant to fully drain.
    To speed drainage, lift the bike slightly or open the bleed bolt (if present) on the opposite radiator.
    Refit the drain bolt securely once empty.
  7. Flush with distilled water (optional but recommended for very old or dirty coolant).
  8. Add new coolant.
    Use a funnel and pour slowly into the radiator fill until nearly topped up.
  9. Replace the radiator cap securely.
  10. Start the engine and let it idle several minutes to circulate the new coolant.
    Watch for leaks and top off if the level drops after initial cycling.

Model-Specific Details & Owner Tips

  • The brass drain bolt can require either an Allen or Torx bit depending on early- or late-2009 model production.
  • The radiators are connected; ensure both sides are drained for a complete flush.
  • Always monitor for air pockets: gently squeeze radiator hoses after refilling to encourage trapped air out, reducing the risk of overheating during trials riding.
  • Periodically inspect the coolant level before rides. Dirty coolant or frequent top-offs indicate possible leaks or head gasket issues.
  • Do not overfill, and use the correct coolant type as specified for aluminum engine parts to prevent corrosion and damage.

Additional Maintenance Reminders

  • Check air filter condition each time you service the coolanteasy access is available during this job.
  • Inspect spark plug gap (0.6–0.7 mm) for optimal ignition and power.

Routine coolant changes keep your 2009 GAS GAS TXT PRO 300 running cool and strong, helping avoid costly overheating and engine issues. Enjoy smoother, more reliable rides with every flush & fill!

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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.