How to Change the Coolant in a 2007 GAS GAS EC 300
Maintaining the cooling system in your 2007 GAS GAS EC 300 is essential for consistent engine performance and longevity, especially if you ride hard in technical or hot conditions. Below is a proprietary MotoSport guide to changing the coolant in your EC 300, with model-specific tips and cautions to ensure you do it right.
What You'll Need
- Premium engine coolant suitable for off-road 2-stroke motorcycles (avoid straight water–use a proper coolant blend for freeze and corrosion protection)
- Basic hand tools (including a socket set and screwdrivers)
- Catch pan for draining old coolant
- Clean funnel
- Gloves and safety glasses
Steps to Change the Coolant
- Allow the engine to cool completely. Never open the radiator cap while the engine is hot–the pressurized system can spray hot coolant, causing burns.
- Remove the radiator cap. Locate the cap on the left side of the radiator shroud. Twist it off slowly to release any residual pressure.
- Locate and remove the coolant drain bolt. On the 2007 GAS GAS EC 300, the coolant drain bolt is typically found on the water pump cover, which is on the lower right side of the engine. Place your drain pan beneath this area, unscrew the drain bolt, and let the old coolant fully drain out. Some EC 300 models may have an additional drain plug on the left side of the cylinder by the coolant hose; check and remove that if present.
- Flush the system (optional, but recommended). To remove residue or contaminants, flush the radiators and engine passages with distilled water. Replace the drain bolt and fill with water, run the engine briefly (just until it circulates), then drain again. Repeat if necessary until the water runs clear.
- Reinstall the drain bolt. Clean the bolt and seal, check for damage, then torque securely into place. Overtightening can strip threads on the soft aluminum cover.
- Fill the system with fresh coolant. Use a clean funnel to pour coolant into the radiator until it reaches the base of the filler neck. Check your owner's manual for total capacity, as the EC 300 typically requires just under 1 liter. Use a premixed 50/50 coolant suitable for modern aluminum engine components, or mix coolant and distilled water to the manufacturer's specifications.
- Bleed air from the cooling system. Tip the bike from side to side and gently squeeze the radiator hoses to help burp trapped air. Some riders temporarily start the engine with the radiator cap off and carefully top off as air bubbles work their way out–just be ready to immediately shut it off if coolant starts to surge out.
- Replace the radiator cap. Ensure it's seated and tightened properly.
- Check for leaks and test ride. Start your EC 300 and bring it up to operating temperature. Watch for leaks around the drain bolt and radiator seams. After your test ride, double-check the coolant level and top off as necessary.
Important Tips for the GAS GAS EC 300 Owner
- Factory coolant: GAS GAS off-road bikes sometimes ship with a colorless or atypical coolant. It is safe to replace this with any high-quality motorcycle coolant–green, blue, or pink–as long as it is free of silicates or phosphates and approved for aluminum radiators and water pumps.
- Watch for debris: If you see black grains or unusual particles in your drained coolant, this may be harmless gasket material or old sealant, but it pays to monitor in case of progressive hose or gasket wear.
- Avoid tap water: Always use distilled water with your coolant to prevent mineral scaling and corrosion.
- Check the water pump: The EC 300's water pump seals can wear over time. If you notice persistent leaks or milky oil (sign of coolant getting into the engine), replace seals promptly to avoid bigger issues.
- Coolant type: While conventional glycol-based coolant is standard, many GAS GAS owners use high-performance coolants, including waterless and non-aqueous formulas, to battle boil-over and improve reliability for aggressive riding.
- Do not overfill: The cooling system in this model is sensitive to overfilling–leave a small air gap to accommodate expansion as the engine heats.
By following these steps, your 2007 GAS GAS EC 300 will stay cool and reliable on every ride. Remember, proper maintenance extends your machine's life and boosts your confidence on the trail. If you need OEM or aftermarket cooling system 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.