How to Change the Coolant in a 2018 GAS GAS TXT GP 250

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Regular coolant maintenance is crucial to keep your 2018 GAS GAS TXT GP 250 running cool on the toughest trials courses. This model features a high-performance liquid cooling system specifically engineered for lightweight aluminum components, so proper coolant care ensures both optimal engine temperature and longevity of critical parts. Below, MotoSport details the most robust method for changing the coolant–and what to watch for with this particular bike.

Before You Begin

  • Coolant type: Use a special coolant for light alloy engines that protects down to at least -30°C for optimal performance and corrosion resistance.
  • Engine temperature: The engine must be completely cooled before opening or replacing the radiator cap to avoid severe scalding.
  • Safety: If coolant contacts eyes, rinse immediately with fresh water and get medical care.
  • Workspace: Work on a stable surface with the bike upright on a stand.

Tools & Supplies Needed

  • Phillips screwdriver or hex wrench (for tank/radiator shroud removal)
  • Drain pan
  • Fresh coolant suitable for light alloy engines
  • Funnel
  • Gloves & safety glasses

Step-by-Step Coolant Change Guide

  1. Remove the fuel tank and radiator shrouds:

    Disconnect the fuel line and remove the bolts securing the tank and radiator shrouds. Lift off the tank to access the radiator cap and hoses.

  2. Open the radiator cap:

    Carefully twist off the cap while applying downward pressure to release residual pressure. Only do this when the engine is cold to avoid burns.

  3. Drain the old coolant:

    Locate the coolant drain bolt–usually on the lower portion of the water pump or near a coolant hose at the engine base. Position the drain pan underneath and remove the bolt or loosen the hose clamp to let the coolant drain completely.

  4. Flush (optional):

    For best results, you may flush the system with distilled water. Replace the drain bolt or hose and fill with distilled water; run the engine briefly (ensure it's not hot), then drain again.

  5. Reinstall drain plug/hose:

    Ensure the drain bolt or hose is securely reattached to avoid leaks.

  6. Refill with new coolant:

    Using a funnel, slowly fill the radiator with the recommended coolant until it's at the top of the neck. Squeeze the hoses gently to help remove trapped air.

  7. Bleed air from the system:

    Tilt the bike side-to-side and squeeze the hoses. Monitor for air bubbles; add coolant if the level drops. Some models have a bleed screw on the cylinder head–if so, carefully open it to let any trapped air escape, then retighten.

  8. Install the radiator cap and reassemble:

    Install the radiator cap securely. Replace the tank and radiator shrouds, reconnect the fuel line, and secure all fasteners.

  9. Run the engine and recheck level:

    Start the engine and let it idle for a few minutes with the bike upright. Shut off, let cool, and recheck coolant level, topping off if needed.

Key Model-Specific Notes

  • Alloy engine components in the TXT GP series are sensitive to improper coolant. Use only recommended types to prevent corrosion and internal deposit build-up.
  • Radiators are high-efficiency and compact–handle them gently when removing shrouds and tank to avoid damaging fins.
  • If your TXT GP 250 is subjected to frequent low-speed or extreme trial riding, periodic coolant checks are even more critical due to higher thermal loads.
  • Never mix different coolants, as this can reduce the effectiveness and potentially harm internal components.

Troubleshooting

  • If you find coolant in the oil or see milky residue, do not run the bike–internal gasket failure or other major repair may be necessary.
  • Persistent low coolant level after refilling may indicate a leak–inspect all hoses and radiator connections carefully.

Stay on top of your GAS GAS TXT GP 250's cooling system care for maximum performance and long-lasting trail fun.

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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.