How to Change the Coolant in a 2014 GAS GAS EC300: Step-by-Step Guide
Regular coolant changes are vital to keep your 2014 GAS GAS EC300 engine performing at its best and to prevent internal corrosion or overheating. The following proprietary MotoSport guide will walk you through the coolant change process, with specific notes for this rugged two-stroke dirt bike model.
What You Will Need
- Fresh coolant (OE spec: high quality ethylene glycol-based, ideally premixed with distilled water, 30% mixture for long-term protection)
- Drain pan
- Basic hand tools (socket set, screwdrivers, pliers)
- Clean shop rags
- Protective gloves and eyewear
Important Model Notes for the 2014 GAS GAS EC300
- This bike's water pump and seal are known to be vulnerable to wear—check for any signs of coolant mixing with crankcase oil, which may indicate a leaky seal that requires attention before refilling the system.
- The cooling system volume is compact, requiring careful bleeding to remove all air pockets after refilling, which is essential for preventing overheating.
- Always use coolant that meets the manufacturer's recommended spec for aluminum engine components. Avoid hard water, which can cause mineral buildup in radiators.
Steps to Change the Coolant
- Cool the Bike Down: Ensure your EC300 is cool to the touch. Never open the radiator cap on a hot engine—serious burns can result.
- Remove Bodywork as Needed: For better access, take off the radiator shrouds or any plastic that obstructs the radiator cap or hoses.
- Position the Drain Pan: Place the drain pan under the water pump area on the right side of the engine (bottom radiator hose fitting is ideal).
- Open the Radiator Cap: Unscrew the radiator cap to relieve pressure and allow coolant to flow out freely.
- Drain the Old Coolant: Loosen the lower radiator hose clamp, then carefully slide the hose off its fitting, letting the coolant drain completely. Some models also feature a dedicated coolant drain bolt on the water pump cover–if equipped, remove this bolt for more thorough drainage.
- Flush (Optional but Recommended): For heavily used or contaminated systems, flush radiators and passages with distilled water. Reinstall the drain bolt and hose when done. If coolant looked milky or contaminated, inspect water pump seals closely.
- Reattach Hoses and Secure Clamps: Ensure hoses are firmly pushed onto their fittings and clamps are secure to prevent leaks.
- Refill with Fresh Coolant: Slowly pour new coolant into the radiator until the fluid almost reaches the neck. Squeeze the radiator hoses gently to help burp out trapped air.
- Bleed the System: With the cap off, tip the bike side to side and continue to pinch the hoses until air bubbles stop appearing. Top off if necessary. On first start-up, let the engine idle with the radiator cap off until the thermostat opens (you will see coolant circulating), then top off again as the level drops.
- Replace the Radiator Cap: Securely reinstall the cap.
- Inspect for Leaks: Run the bike while monitoring the hose junctions and beneath the water pump for any sign of leakage.
- Final Check: After a brief ride and full cool-down, check the coolant level, as air sometimes works its way out after the initial ride, requiring a minor top-off.
Maintenance Tips
- Change coolant at least once per season or every 2 years, whichever comes first, for optimal corrosion protection.
- Monitor for any persistent loss of coolant or signs of cross-contamination with oil, as this indicates water pump seal failure—a known issue on some 2014 EC300 bikes.
- Maintaining proper coolant level is critical for two-stroke longevity, especially when riding under extreme loads or slow technical conditions that challenge the cooling system.
Proper routine care keeps your 2014 GAS GAS EC300 running cool, reliable, and ready for every trail. Find all your maintenance essentials and OEM-fit parts at MotoSport—your one-stop powersports shop.
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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.