How to Change the Coolant on a 2009 GAS GAS TXT PRO 125
Regular coolant maintenance is crucial for the longevity and performance of your 2009 GAS GAS TXT PRO 125. With its high-performance liquid-cooled engine designed for trials riding, proper coolant service ensures consistent temperatures even in demanding conditions. This guide will take you step-by-step through changing the coolant, providing model-specific tips owners need to know.
What You Will Need
- Coolant formulated for lightweight alloy engines, rated for –30°C or better
- Drain pan
- Socket set
- Funnel
- Torque wrench (recommended)
- Gloves & safety goggles
- Cotton rags
Preparation
- Ensure the engine is completely cool before starting. Opening the radiator cap on a hot engine can cause severe scalding.
- Position the bike securely on a stand.
Removing the Fuel Tank
For easy access to the radiator, the fuel tank should be removed:
- Make sure the fuel tap is in the closed position.
- Disconnect the fuel tube from the cock and unscrew the front upper Allen screw (M4) securing the tank.
- Lift and remove the tank from the chassis.
Draining the Old Coolant
- Locate the radiator cap and the coolant drain bolt (typically found on the lower side of the water pump cover).
- Place the drain pan directly underneath.
- Slowly remove the radiator cap first, then loosen the drain bolt and allow all coolant to flow out completely.
- Inspect the old coolant for signs of contamination or rust.
Flushing (Optional but Recommended)
- Reinstall the drain bolt gently and fill the system with distilled water.
- Run the bike for a few minutes, let it cool, and drain again to thoroughly remove old fluid and debris.
Filling With New Coolant
- Ensure the drain bolt is tightened to factory specs.
- Add coolant designed for aluminum enginesavoid premixes not rated for lightweight trials engines.
- Slowly pour coolant into the radiator until it’s full, allowing air to escape as you pour.
Bleeding the System
- With the radiator cap off, start the engine and run at idle for a few minutes. Squeeze the radiator hoses gently to help expel trapped air.
- Top off coolant as needed once bubbles stop rising.
- Never let engine overheat during this process.
Reinstallation
- Refit the fuel tank and reconnect all hoses securely.
- Double check for leaks around the drain bolt and hose connections.
- Check the coolant level after the first ride and top off if necessary.
Notes Specific to the 2009 GAS GAS TXT PRO 125
- This model's cooling system is compactair pockets can form easily, making careful bleeding especially important.
- Only use coolants compatible with magnesium and aluminum components found on the TXT PRO engine–cheap or incompatible coolants can cause pitting or corrosion.
- If you notice chronic coolant loss without visible leaks, check water pump seals, which can deteriorate over time, particularly in trial models frequently exposed to mud and water crossings.
Final Checks
- Allow the bike to cool after your first ride, then re-inspect and top up coolant if necessary.
- Dispose of old coolant responsibly, as it is hazardous to people, pets, and the environment.
Stay on top of coolant changes to keep your 2009 GAS GAS TXT PRO 125 running cool–and ready for whatever obstacles lie ahead!
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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.