How to Change the Coolant in a 2013 GAS GAS TXT PRO 125
The GAS GAS TXT PRO 125 is a competition-level trials bike featuring a lightweight alloy engine design, making appropriate maintenance – such as coolant changes – critical for sustained peak performance. Here is a step-by-step, MotoSport-exclusive guide for changing your coolant safely and thoroughly on the 2013 TXT PRO 125:
1. Preparation – Safety and Workspace
- Ensure the engine is completely cool before beginning. Removing the radiator cap on a hot engine can cause severe burns from pressurized steam or coolant.
- Work in a well-ventilated area and place the bike on a stable stand.
- Gather the required supplies: recommended coolant for light alloy engines, a drain pan, basic hand tools, and rags.
- Wear gloves and protective eyewear.
2. Access the Radiator System
- Remove the seat and fuel tank for unobstructed access to the radiator. On the TXT PRO 125, disconnect the fuel line at the tap, and unscrew the mounting bolt from the top/front of the tank. Lift the tank forward and upward to remove it from the frame (be mindful of wires or hoses).
3. Draining the Old Coolant
- Locate the coolant drain plug on the engine case (often at the water pump). Position your drain pan beneath it.
- Slowly loosen and remove the radiator cap to break system vacuum (again, only when cool!).
- Remove the drain plug and let all coolant fully drain from the system. Tilt the bike gently to ensure full drainage.
4. Flushing (Recommended for Thoroughness)
- Replace the drain plug temporarily. Fill the system with distilled water. Briefly start the engine for 30–60 seconds (do not let it overheat), then shut off and drain again to flush residual old coolant.
- Repeat as needed until water runs clear.
5. Refilling the System
- Tighten the drain plug securely.
- Fill the radiator with appropriate coolant for lightweight alloy engines (choose a premix offering freeze protection to at least -30°C).
- Add coolant slowly, allowing air to escape. Fill until visible in the neck of the filler.
6. Bleeding Air from the System
- With the radiator cap off, slowly rock the bike side to side to help trapped air escape.
- Restart the engine and let it idle. As the engine warms, trapped air bubbles to the surface. Top off the coolant as necessary.
- Once no bubbling occurs, turn off the engine, let it cool fully, and recheck the fluid level. Fill again if required.
- Install and tighten the radiator cap.
7. Reassembly – Final Checks
- Reinstall the fuel tank and reconnect its fittings. Replace the seat.
- Start the bike and bring it up to operating temperature. Once cooled, recheck coolant level and inspect for leaks.
- Dispose of old coolant responsibly – it is toxic and should never be poured down drains.
Model Specific Tips for the 2013 GAS GAS TXT PRO 125:
- This bike's alloy engine is sensitive to using non-compatible coolants. Always choose a formulation for aluminum engines.
- The coolant capacity is relatively small – do not overfill. Overfilling can reduce expansion space in the system and cause leaks.
- If you notice the coolant level drops after one heat cycle, this is normal as air works out. Persistent level drops or overheating could indicate more significant issues such as a leaking water pump seal or head gasket and should be addressed promptly.
- Regular coolant changes (at least every two years, more if you ride in extreme conditions) ensure proper engine cooling and system longevity.
Use only approved coolants and OEM-quality replacement parts. For convenience and performance confidence, shop parts for your ride now!
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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.