How to Change the Coolant in a 2021 GAS GAS EX 250F
Keeping the coolant in your 2021 GAS GAS EX 250F fresh is essential for optimal engine performance and long-term durability. Below you will find a model-specific step-by-step guide for changing the coolant, along with important tips every owner should know about this high-performance dirt bike.
Why Change the Coolant?
The coolant not only protects against overheating but also prevents corrosion internally. For racing or regular off-road use, GAS GAS recommends regular coolant changes to maintain peak efficiency and maximize component life. Always follow the manufacturer’s recommended service intervals and use high-quality coolant designed for modern motocross and enduro engines.
Tools & Supplies Needed
- Fresh, approved motorcycle coolant (silicate-free; check your owner's manual for specification)
- Drain pan
- 8mm socket or wrench (to remove drain bolt)
- Pliers (for hose clamps if needed)
- Clean rags
- Protective gloves
Step-by-Step Coolant Change
-
Allow the engine to cool completely.
Never try to open the radiator cap or cooling system components when the engine is hot–serious burns may result. -
Secure the motorcycle.
Place the EX 250F on a level surface or center stand. Secure the bike with tension straps if needed so it remains steady (consult your owner's manual for tie-down guidance) . -
Remove the radiator cap.
Open it slowly to release pressure. -
Locate the coolant drain bolt.
On the 2021 EX 250F, the drain bolt is typically at the lower side of the engine water pump cover. -
Place a drain pan beneath the drain area.
Remove the drain bolt with your 8mm tool. Allow the old coolant to flow out completely. -
Inspect & reinstall the drain bolt.
Check the sealing washer or O-ring for wear. Replace if damaged. Reinstall and properly torque the drain bolt as specified in your owner's manual. -
Flush if needed.
If the old coolant was very dirty or you are switching types, flush the system with distilled water and drain again. -
Fill with new coolant.
Slowly add coolant through the radiator filler neck. Fill until the coolant reaches the bottom of the filler neck.
Note: Some EX 250F models feature a small air bleed screw near the top of the cylinder head. Loosen the bleed screw until coolant flows steadily to remove trapped air, then retighten. Always confirm in your manual if your bike includes this feature. -
Refit the radiator cap.
Once filled and bled, securely refit the cap. -
Start the engine and check.
Run the bike at idle for several minutes. Watch for leaks and let the engine reach full operating temperature. Switch off and check coolant level again–top off as needed.
2021 GAS GAS EX 250F Model Tips
- The EX 250F shares architecture with other late-model Austrian enduro bikes, making OEM parts sourcing straightforward through MotoSport.
- Pay extra attention to radiator fin condition–mud and sand can quickly block airflow, especially in off-road environments. Straighten bent fins and clean the radiators during every coolant service.
- If riding in harsh conditions (mud, sand, deep water), inspect the coolant for signs of contamination more often, as these conditions accelerate wear on seals and may introduce water to the system.
- Always use fresh, brand-appropriate coolant. Mixing incompatible types can reduce cooling efficiency and corrode internal passages.
Final Checks
- Properly dispose of old coolant–it is toxic to humans and animals.
- Recheck for leaks over the next ride or two as the system pressurizes fully.
Proper, regular coolant changes will help your 2021 GAS GAS EX 250F perform at its best and protect expensive engine and cooling components for seasons to come. Ride hard and maintain smart!
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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.