How to Change the Coolant in a 2007 GAS GAS EC125
Routine coolant changes are essential for the longevity and performance of your 2007 GAS GAS EC125. The process is straightforward–here are the MotoSport exclusive, step-by-step instructions tailored for your dirt bike.
Preparation
- Ensure the engine is completely cool before starting.
- Position the bike upright on a stable stand.
- Gather tools: socket set, screwdriver, funnel, drain pan, and the correct pre-mixed or dilute-to-spec coolant (avoid tap water–use distilled water when mixing).
- Have protective gloves and clean rags ready for spills.
Draining the Old Coolant
- Remove the side panels if necessary for better access to the radiator area.
- Place the drain pan beneath the water pump–typically located at the lower right side of the engine.
- Locate and remove the coolant drain bolt from the water pump cover. Open the radiator cap to allow air in and speed draining.
- Let all old coolant fully drain out. Inspect the drained fluid for unusual color, particles, or signs of contamination.
Flushing (Recommended)
- For best results, flush the system with distilled water before refilling. Reinstall the drain bolt and fill the radiator with distilled water, then run the engine briefly (just a minute or two with cap off), shut off, and drain again. Repeat if fluid comes out dirty.
Refilling with New Coolant
- Reinstall the drain bolt using a fresh sealing washer if available. Tighten to manufacturer torque specs.
- Fill the radiator slowly with the recommended coolant–fill to the base of the filler neck.
- If equipped with a bleeder screw on the cylinder head, slightly open it while filling to let trapped air escape. Tighten after fluid emerges without bubbles.
Burping the System
- Leave the radiator cap off. Start the engine and let it idle for a few minutes. Gently rock the bike and blip the throttle to free any air bubbles.
- When the coolant level drops, top it off to the base of the filler neck.
- Turn off the engine and let it fully cool. Recheck and top up the radiator and overflow reservoir as needed.
- Once the level stabilizes, install the radiator cap securely.
Cleanup and Final Checks
- Wipe up spills and reinstall any removed panels.
- Dispose of the old coolant properly–never pour it down the drain or on the ground.
- Check the cooling system for leaks and monitor the coolant level after your first ride.
Special Notes for 2007 GAS GAS EC125 Owners
- This model uses a two-stroke powerplant, so always use coolant suitable for high-performance, aluminum engines to prevent corrosion and maintain cooling efficiency.
- Avoid mixing different coolant types (for example, don't combine silicate-based and OAT coolants) as this can reduce system effectiveness.
- The 2007 EC125 has a simple, open cooling system–if your bike does not have a bleed screw, take extra care to burp all air during refilling.
- Check for white, brown, or milky coolant, which can indicate a gasket or water pump issue–address these before refilling with fresh coolant.
Changing your EC125's coolant keeps your engine temperatures stable under racing conditions and mud, protecting your investment every ride.
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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.