How to Change the Coolant in a 2011 GAS GAS EC 300: Step-by-Step Guide
Shop parts for your ride now!Maintaining the cooling system in your 2011 GAS GAS EC 300 is essential for peak engine performance and longevity. Periodic coolant changes prevent overheating, corrosion, and costly repairs. Here is MotoSport's proprietary process for changing the coolant – with vital notes specific to this unique dirt bike model.
Preparation
- Allow the engine to cool fully. Hot coolant can cause severe burns, and radiator components warp easily when hot.
- Gather required tools:
- Socket set to fit the water pump cover (typically 8mm)
- Drain pan
- Fresh coolant meeting manufacturer performance standards
- Rags and gloves
- Park your EC 300 on a level surface with adequate lighting and access.
Draining the Old Coolant
- Locate the coolant drain bolt on the water pump’s cover (lower right side of the engine).
- Place your drain pan directly beneath. Remove the drain bolt; coolant will begin to drain out.
- Remove the radiator cap to speed the draining process. Air entering from above pushes the coolant out efficiently and flushes both radiators–this parallel system ensures full evacuation of the fluid.
- If coolant does not flow freely, check for blockages or sticky residue near the radiator neck. Clean as needed before proceeding.
Flushing and Inspection
- If the drained coolant shows whitish spots (aluminum corrosion) or is brown (rust from steel parts), flush the cooling system with distilled water until clear.
- Inspect for leaks, damage, or missing gaskets throughout the cooling circuit.
Refilling With Fresh Coolant
- Reinstall the drain bolt and torque it to 9 Nm to ensure a proper seal.
- Use a new gasket at the water pump cover to prevent leaks.
- Fill the radiator all the way to the brim with fresh coolant.
- Replace the radiator cap.
Final Checks
- Start the engine and let it reach operating temperature while stationary. This opens the thermostat and circulates coolant.
- Turn off the engine and wait for it to cool fully.
- Recheck the coolant level at the radiator neck. Fill to the cap if necessary.
Special Notes for 2011 GAS GAS EC 300 Owners
- This model relies on a parallel radiator circuit. Ensure both radiators are thoroughly drained and refilled.
- Always replace the water pump cover gasket; reusing this can result in leaks or air ingress, risking engine damage.
- Keen attention to corrosion signs helps identify deeper issues early. Whitish residue means damaged aluminum parts; brown coolant signals steel corrosion. Flush promptly if seen.
- Recommended spark plug for the EC 300: Denso W24ESR-U (gap 0.7–0.8 mm) or NGK BR8EG. Consider checking the spark plug and air filter while performing cooling system maintenance for holistic reliability.
Performing a coolant change every season or whenever corrosion or contamination is found will keep your GAS GAS EC 300 running cool and strong. For replacement gaskets, coolant, and service parts, Shop parts for your ride now!
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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.