How to Change the Coolant in a 2003 GAS GAS TXT PRO 280
Maintaining proper coolant in your 2003 GAS GAS TXT PRO 280 is essential for optimal performance and engine longevity. Unlike many standard dirt bikes, the TXT PRO 280's lightweight trial design and high-compression two-stroke engine require special attention to coolant choice and procedure. Use the following proprietary MotoSport guide to change the coolant cleanly and efficiently–specific for your ride.
Before You Begin
- Ensure the engine is completely cool before beginning. Attempting this with a hot engine risks severe scalding due to pressurized coolant release.
- Always use a coolant formulated for light alloy engines. Avoid plain tap water which can cause corrosion and cavitation in the aluminum components.*
- Have ready: a catch pan, rags, a funnel, a suitable coolant mix (typically -30°C rating), and basic hand tools.
Step 1 – Remove the Fuel Tank
- Loosen the fuel tank by disconnecting the fuel line and unscrewing the mounting bolts at the front and top.*
- Lift the tank gently from the front and remove it completely to access the radiator and its cap.
Step 2 – Locate the Radiator Cap & Drain Point
- The radiator cap is situated beneath the tank on the upper chassis.
- Find the coolant drain bolt: typically located at the lowest point on the water pump or lower side of the engine case.
Step 3 – Drain the Old Coolant
- Place a catch pan beneath the drain bolt.
- Carefully loosen and remove the radiator cap to allow air in, then remove the drain bolt and let all coolant flow out.*
- If necessary, disconnect the lowest radiator hose to speed draining.
Step 4 – Flush the System (Recommended)
- Optional but best practice: briefly flush the system with distilled water by filling the radiator, running the engine for a minute, then draining again.
Step 5 – Refit the Drain Bolt
- Reinstall and tighten the drain bolt securely, ensuring its sealing washer is in good condition.
Step 6 – Add Fresh Coolant
- Using a funnel, slowly fill the radiator with a high-quality, premixed coolant suitable for alloy engines, rated for at least -30°C freeze protection.*
- Fill to just below the rim of the filler neck to allow for expansion.
Step 7 – Bleed Air from the System
- With the radiator cap off, briefly start the motor and let it idle so bubbles can escape. Stop immediately if coolant wells up or overflows.
- Top up the coolant again if necessary and replace the cap securely.
Step 8 – Refit the Fuel Tank
- Reinstall the tank, reconnect hoses, and tighten all mounting bolts.
Step 9 – Final Check
- Run the engine while monitoring for leaks and ensure proper coolant circulation. After fully cooling down, check coolant level and refill if necessary.
Important Notes for the 2003 GAS GAS TXT PRO 280 Owner
- This model's cooling system lacks an overflow tank–avoiding overfilling is essential.
- Inspect for signs of leaks at hose connections and water pump–aged hoses are a known issue on older TXT PROs.
- The TXT PRO's radiator and cap are relatively exposed; always clear away debris after rides to avoid blocked fins or impaired airflow.
- The recommended coolant replacement period is every two years, or immediately after any major engine work or suspected contamination.
Regularly monitoring and changing your coolant will keep your 2003 GAS GAS TXT PRO 280 performing to its high standards on the trials course. Use only genuine or high-quality compatible parts to protect your engine for years to come.
*Always dispose of old coolant responsibly according to local regulations.
Related Shopping Categories
Shop Radiator Hoses for Your Ride
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.