How to Change the Coolant in a 2021 GAS GAS EC 250
Regularly maintaining the coolant in your 2021 GAS GAS EC 250 is essential for preserving engine performance and preventing overheating during demanding rides. GAS GAS motorcycles use a closed liquid cooling system that requires proper attention. This guide will walk you through each step, providing tips specific to the EC 250 two-stroke model.
What You Need
- Fresh recommended coolant (compatible with aluminum components; most OEM or high-quality motorcycle-specific coolants are suitable)
- Drain pan
- Ratcheting socket set with metric sockets
- Phillips or flat-blade screwdriver
- Clean rags and gloves
- Safety glasses
Precautions for the GAS GAS EC 250
- Never open the radiator cap or cooling system while hot. Allow the engine to cool to avoid burns or scalding from hot coolant and steam.
- Follow the manual schedule: GAS GAS recommends coolant replacement a minimum of every 48 months or sooner if operating in extreme environments.
- Dispose of old coolant properly. Used coolant is hazardous and must be discarded at an authorized collection facilitynever pour it onto the ground or into drains.
Step-by-Step Coolant Change Procedure
- Allow the EC 250 engine to cool fully by letting the bike sit for at least 30 minutes after use (do not skip this step).
- Remove the radiator cap. The radiator cap is located on the left side beneath the fuel tank shroud. Twist the cap counterclockwise and set it aside.
- Locate the coolant drain screw. On the EC 250, the drain bolt is positioned on the lower water pump cover (right side of the engine, underneath the crankcase). Some models use an 8 mm or 10 mm bolt.
- Position a drain pan under the drain bolt, then remove the bolt to allow coolant to drain fully.
- Open the bleed screw/plug. The EC 250 is equipped with a bleeder screw atop the cylinder head. Loosen this with a Phillips screwdriver to enhance draining and air removal from the system.
- Inspect hoses and connections. Check for cracking or swelling–replace any suspect hoses for reliability. GAS GAS radiators and hoses are robust but can wear from impact or age.
- Reinstall the drain bolt. Torque to manufacturer specifications (typically around 6-8 Nm), and use a new copper washer if equipped.
- Fill with fresh coolant. Add coolant slowly through the radiator neck until full.
- Bleed the cooling system. With the bleed screw open, continue adding coolant until it seeps from the bleeder free of air bubbles. Tighten the bleed screw securely.
- Top off the coolant. Fill the radiator up to the neck.
- Reinstall the radiator cap. Secure cap by pressing down and turning clockwise until tight.
- Warm the engine. Start the engine, let it idle for a few minutes with the bike upright. Check for leaks and topping off the coolant as needed.
Model-Specific Tips for the 2021 GAS GAS EC 250
- Care for two-stroke system: The EC 250 has an integrated two-stroke oil tank. Avoid spilling coolant into the oil tank during filling–wipe any overspill immediately.
- Racing or hard enduro: Upgrade to high-performance or racing coolant if you ride in extreme heat, slow technical terrain, or use the EC 250 for competition.
- Inspect radiator guards: The stock shrouds provide minimal protection. If you ride off-road aggressively, consider aftermarket guards to prevent radiator damage and enhance cooling reliability.
Final Checks
- After your first short ride, recheck the coolant level while cold and inspect for leaks.
- Maintain a 50–50 mix of antifreeze to distilled water if using concentrated coolant.
- Keep your GAS GAS EC 250's radiator fins clean and free from mud for peak cooling efficiency.
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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.