How to Change the Coolant in a 2009 GAS GAS EC 300
Refreshing the coolant in your 2009 GAS GAS EC 300 is essential for optimal engine performance and to avoid costly repairs from overheating. Use a high-quality ethylene glycol-based motorcycle coolant that is compatible with aluminum components. Here's the complete process designed specifically for your EC 300:
What Makes the 2009 GAS GAS EC 300 Unique?
- The EC 300 is a 2-stroke enduro featuring a robust liquid-cooled engine and a dual-radiator cooling system for consistent engine temperatures, even under demanding off-road use.
- This bike is renowned for its nimble chassis, high ground clearance, and proven performance in technical terrain. Maintaining proper coolant levels is particularly important, as overheating can damage the cylinder, piston, or head gasket.
- The radiator cap is pressurized – never attempt removal when hot to avoid burns from escaping steam.
Step-by-Step Coolant Change Guide
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Preparation:
- Ensure the engine is completely cool before starting.
- Put on gloves and have rags ready for spills.
- Place a drain pan under one of the radiators.
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Remove the Radiator Cap:
- Unscrew the radiator cap located on top of the right-side radiator. Do not open when hot.
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Drain the Old Coolant:
- Locate the coolant drain bolt at the base of the water pump cover (right side of the engine).
- Remove the bolt and allow the coolant to flow into your drain pan. Tilting the bike slightly or removing the lower radiator hose can help fully empty the radiators if needed.
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Flush the Cooling System (Recommended):
- To remove all old coolant and contaminants, fill the system with distilled water, replace the drain bolt, and run the engine briefly. Let the engine cool, then repeat the drain step. Do not use tap water as it can cause mineral deposits.
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Reinstall the Drain Bolt:
- Inspect, clean, and reinstall the drain bolt with the correct torque (refer to your manual's specification).
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Fill with New Coolant:
- Slowly fill the radiator with fresh coolant, pausing to let trapped air escape.
- Gently rock the bike side to side to help air pockets surface.
- Fill to just below the base of the radiator neck, then refit the radiator cap securely.
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Start and Bleed the System:
- Start the engine and let it idle for several minutes. Squeeze the radiator hoses gently to help purge any remaining air.
- Shut down, allow the engine to cool, and re-check the coolant level. Add more if necessary.
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Inspect for Leaks:
- Carefully check around the drain bolt, water pump, and hose clamps while the engine is running at operating temperature.
Essential Tips for EC 300 Owners
- Maintain the correct coolant level at all times. The EC 300 is susceptible to overheating in slow, technical riding if underfilled.
- Always check the radiator fins for mud or debris that could restrict airflow and clean as needed.
- Check the condition of radiator hoses and clamps—replace at the first sign of wear or cracking.
- Use only manufacturer-recommended coolant or a high-quality equivalent for best protection.
Disposal Notice
Dispose of the waste coolant properly according to your local laws. Never pour old coolant down the drain or onto the ground.
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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.