How to Change the Coolant in a 2025 GAS GAS EX 250F: Step-by-Step MotoSport Guide
Changing the coolant in your 2025 GAS GAS EX 250F is essential for keeping the engine running cool and extending its life, especially as this model features a high-efficiency cooling system routed through the frame's central tube for optimized flow and reduced hose count. This proprietary MotoSport guide breaks down the process so you can confidently tackle this crucial maintenance task at home.
What You Will Need
- Coolant compatible with aluminum engines (Motocool, Engine Ice, or manufacturer-recommended fluid)
- Socket set – usually 10mm for the drain bolt
- Drain pan or catch basin
- Gloves and rags for cleanup
- Small funnel
- Torque wrench
- Distilled water for flushing (if desired)
Preparation
- Make sure the engine is completely cool to prevent burns.
- Work in a well-ventilated area and keep coolant away from pets & children.
- Prop the bike securely on a stand so it sits level.
How to Drain the Coolant
- Remove the radiator cap on the right side of the bike by turning counterclockwise. This step relieves system pressure and allows coolant to drain freely.
Tip: The radiator cap is often tight, so a rag can help get a good grip. - Locate the coolant drain bolt at the water pump cover near the bottom right of the engine. Position your drain pan underneath.
- Loosen the drain bolt (usually 10mm) and let the coolant drain completely into the pan. Tilt the bike gently side-to-side to help drain as much old coolant as possible for a thorough flush.
- If desired, flush with distilled water by reinstalling the drain bolt, filling the radiator with distilled water, running the engine briefly (1-2 mins), and draining again.
Refilling the Coolant System
- Install and torque the drain bolt to manufacturer spec (typically around 10 Nm, but always double-check your owner's manual for your exact torque requirement).
- Using your funnel, slowly pour new coolant into the radiator until it is just below the bottom of the filler neck.
Go slow to avoid trapping air bubbles in the system. - On the 2025 GAS GAS EX 250F, there is typically a bleeder screw on top of the cylinder head or at the radiator. Loosen this screw slightly to allow trapped air to escape as you fill. When pure coolant (no bubbles) comes out, retighten the bleeder screw firmly.
Bleeding the system is vital for proper flow & cooling performance. - Top off the radiator if the level has dropped after bleeding.
Final Steps
- Reinstall the radiator cap securely.
- Start the engine and let it idle until it warms up. Watch the coolant level (with the cap off if possible). Top up if needed.
- Check for leaks at the drain bolt and around the radiator. Tighten if necessary.
- Once fully cooled, double-check the coolant level and top off as needed for optimal performance and protection.
Notes for 2025 GAS GAS EX 250F Owners
- The central cooling tube design in the 2025 model ensures fewer hoses and improved coolant circulation, but it also means it's important to thoroughly bleed the system of air – air pockets can compromise the bike's cooling ability and performance.
- Use only high-quality coolant safe for aluminum components. Do not use straight water except for flushing.
- Regularly check your coolant level and condition – if it looks dirty or rusty, change it promptly for the health of your engine.
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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.