How to Change the Coolant in Your 2008 GAS GAS EC 300
Regular maintenance of your GAS GAS EC 300's cooling system is essential for optimal engine performance and longevity. Swapping coolant on this two-stroke enduro machine requires attention to detail, especially considering its unique European design. Below is MotoSport's proprietary step-by-step guide for a thorough coolant change and flush.
Preparation
- Allow the engine to cool completely before beginning work. Hot coolant can cause severe burns.
- Position your EC 300 upright on a stable stand to ensure balanced draining and refilling.
- Gather necessary tools: 8mm or 10mm socket (water pump drain bolt), a catch pan, funnel, fresh coolant suited for aluminum radiators, distilled water (optional for flushing), gloves, and rags.
Draining Old Coolant
- Locate the water pump cover on the lower right side of the engine.
- Place your catch pan beneath the water pump area.
- Remove the drain bolt on the water pump cover. For many EC models, this is an M6 screw; loosen it carefully to let coolant flow into the pan.
- Open the radiator cap to accelerate draining and allow air into the system for a complete empty. – Skip this step if the bike has a pressurized or expansion tank — instead, open the highest point of the cooling system.
- Ensure coolant drains from both radiators. The EC 300 features parallel radiator plumbing, so old coolant should leave both sides simultaneously.
Flushing the System (Recommended)
- After draining, you can flush with distilled water to clear any residues or contaminants.
- Reinstall the drain bolt lightly, fill the radiators with distilled water, start the bike briefly (no longer than 30 seconds), then shut off, and repeat draining.
Refilling with New Coolant
- With the drain bolt securely tightened (torque to 10 Nm), begin slowly adding fresh coolant into the radiator fill.
- Fill up to approximately 1.2 liters, or until coolant sits about 10 mm above the radiator fins. The EC 300 cooling system capacity is typically 1.2 liters, but always check sight lines or the manual for confirmation.
- Replace the radiator cap (or expansion tank cap) securely.
Bleeding Air from the System
- With the radiator cap off, start the bike and allow it to idle while monitoring the coolant — be cautious to prevent spills.
- Watch for air bubbles rising; once the thermostat opens, coolant level might drop as air escapes – top off as needed.
- When bubbling stops and the coolant level stabilizes, cap your radiator.
Post-Service Steps
- Wipe up any spilled coolant; rinse any affected skin and change clothing immediately if exposed to coolant.
- Take a short test ride to bring the bike to operating temperature. After cooling, recheck coolant level, topping off as necessary.
MMY Owner Notes for 2008 GAS GAS EC 300
- Use only coolant formulated for modern aluminum radiators. Standard automotive coolant may cause corrosion.
- The EC 300 is known for solid cooling, but check hoses and clamps for leaks during service.
- The parallel radiator design ensures efficient cooling, but also means trapped air can be an issue during refill – allow enough time for a thorough bleed.
- Cooling system bolts are metric; overtightening can strip threads in the soft aluminum – always use a torque wrench.
- If upgrading exhaust or silencer (like the FMF Powercore 2), confirm that cooling system access is not obstructed.
With fresh coolant coursing through your EC 300, you'll be ready for peak performance during your next rip. Always dispose of old coolant responsibly, and consider inspecting the radiator shrouds and cap seals as part of this service.
Related Shopping Categories
Shop Radiator Hoses for Your Ride
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.