How to Change the Coolant in a 2009 GAS GAS EC125 Dirt Bike
Routine coolant replacement keeps your 2009 GAS GAS EC125 running cool & protected–essential for two-stroke reliability both on race days and long trail rides. This detailed guide, built specifically for loyal MotoSport riders, shows you the right way to flush and refill the cooling system on your EC125.
Why Replace the Coolant?
- Old coolant breaks down, causing corrosion, overheating, and reduced cooling performance.
- Fresh coolant ensures maximum heat transfer, freeze, and boil-over protection for your 125cc engine.
What You Need
- Pre-mixed motorcycle coolant (or concentrate plus distilled water if mixing yourself)
- Socket set or wrenches
- Drain pan
- Clean rags
- Protective gloves
Gas Gas EC125 Coolant Specific Notes
- This liquid-cooled two-stroke uses aluminum radiators sensitive to mineral buildup, so always use distilled water if mixing coolant.
- Never substitute with automotive coolant containing silicate additives–they can erode internal seals and radiator cores.
- Change the coolant at least once per year for best results, and always after heavy race conditions or muddy riding.
Step-by-Step Coolant Change Guide
- Let the engine cool completely. Never attempt this job with a hot motor—risk of burns and system pressure release.
- Stabilize your bike. Place it upright using a stand.
- Remove the radiator cap. This relieves pressure and allows for faster draining.
- Locate the coolant drain bolt.
- Typically found at the bottom of the water pump cover or at the lowest radiator hose on the EC125.
- Position your drain pan to catch fluid.
- Remove the drain bolt and allow coolant to flow out fully.
- Some models may have a small copper washer for sealing–inspect and replace if needed.
- Tilt the bike gently side to side to help fully empty the radiator and engine.
- Reinstall and torque the drain bolt.
- Use a new sealing washer if equipped.
- Pour in fresh coolant through the radiator fill neck until it reaches the top.
- Fill slowly to avoid air pockets.
- Burp the cooling system.
- Start the engine with the cap off for 30–60 seconds, then gently blip the throttle. This helps expel trapped air bubbles.
- Some EC125 engines may have a bleed screw on top of the cylinder head–crack it gently to release any remaining air, then retighten.
- Top up coolant if the level drops after burping.
- Reinstall the radiator cap securely.
- Check and top off the overflow reservoir if equipped.
- Dispose of used coolant responsibly. Never pour it down drains—use a local recycling center.
EC125 Owner Tips
- Inspect radiator hoses and clamps for cracks or leaks each time you service coolant.
- Watch for signs of overheating after service–if the level drops quickly, recheck for air bubbles or leaks.
- The EC125's high-RPM design makes proper cooling and frequent checks especially important for engine longevity.
Now your 2009 GAS GAS EC125 is ready for a summer of smooth, cool running—on track or trail. MotoSport always has you covered for trusted parts, fluids, and expert advice!
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.