How to Change the Coolant in a 2017 GAS GAS TXT PRO RACING 300
Changing the coolant on your 2017 GAS GAS TXT PRO RACING 300 is essential for keeping the engine performing strongly and prolonging its life, especially with the unique demands of trials riding. Follow this step-by-step MotoSport.com guide for a smooth, mess-free coolant replacement process, and read on for important model-specific notes.
Preparation – Safety First
- Make sure the engine is completely cool before starting. Opening the radiator cap while hot can cause burns from pressurized steam or hot coolant escape.
- Gather supplies: new coolant (refer to your owner's manual for compatible coolant, commonly ethylene glycol-based for GAS GAS models), a drain pan, funnel, clean rags, and basic tools (screwdrivers, pliers, sockets).
- Work outdoors or in a well-ventilated area, and wear gloves and eye protection.
Step 1: Remove the Radiator Cap
- Locate the radiator cap on the right side of the bike. Slowly unscrew and remove the cap to release system pressure.
Step 2: Drain the Old Coolant
- Position your drain pan beneath the water pump or bottom radiator hose on the right side of the engine.
- Loosen the drain bolt on the water pump cover – typically an 8mm or 10mm bolt. Allow all coolant to drain out.
- If your machine does not have a dedicated drain bolt, carefully remove the lower radiator hose where it connects to the water pump to drain the coolant.
- To help flush out the old coolant, tilt the bike gently from side to side.
Step 3: Flush the Cooling System (Recommended)
- After draining, you may pour a small amount of distilled water into the radiator, then reinstall the drain bolt or hose and start the engine briefly (10-20 seconds) to circulate. Shut off, let cool, and drain again for a complete flush.
Step 4: Reinstall Drain Bolt or Hose
- Check the sealing washer and clean the mating surfaces. Refit the drain bolt or lower hose securely, being careful not to overtighten and strip the threads.
Step 5: Fill with Fresh Coolant
- Using a funnel, slowly pour the new coolant into the radiator until it reaches the bottom of the filler neck.
- Gently squeeze the radiator hoses by hand. This helps to burp trapped air bubbles.
Step 6: Bleed Air from the System
- Briefly start the engine with the radiator cap off, letting it idle for 1-2 minutes to circulate coolant and dislodge air pockets. Watch for shifting coolant levels.
- Top off the radiator again as needed, then install the radiator cap.
Step 7: Check Levels After Cycling
- After the first ride or once the engine has fully cooled, recheck the coolant level and top off if needed. The system may self-bleed small bubbles over the first heat cycles.
Important Notes for the 2017 GAS GAS TXT PRO RACING 300
- The Pro Racing 300 uses a lightweight, high-capacity cooling system tailored for low-speed, high-precision riding. Overheating is rare, but proper coolant and clean radiators are essential.
- The recommended coolant capacity is approximately 0.5-0.7 liters, but always confirm in your owner's manual or measure drained volume for accuracy. Overfilling can cause overflow from the expansion tank.
- Clean the radiator fins of mud and debris regularly. Trial bikes often accumulate dirt at low speeds, restricting airflow.
- Use only high-quality coolantdo not mix colors or types, and avoid hard water that can leave mineral deposits in the system.
- Inspect hoses and clamps for leaks or wear. The flexible design of the TXT PRO RACING 300 makes hose routing more vulnerable to chafing over time.
- If you drop the bike hard or notice overheating, always check for coolant loss or signs of damage to the radiator or hoses.
Disposal
- Never dump old coolant down drains or on the ground. Take it to a hazardous waste facility or a suitable recycling center to protect the environment.
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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.