How to Change the Coolant in a 2010 GAS GAS EC 300
Regular coolant changes are essential for maintaining the performance and longevity of your 2010 GAS GAS EC 300. This two-stroke enduro is renowned for its agility and robust build, but its cooling system demands proper attention to ensure reliability under all riding conditions. Follow this proprietary MotoSport guide to keep your GAS GAS EC 300 running cool, whether tearing through trails or lining up for an enduro event.
What You Need
- New coolant (Silicate-free formula recommended, typically 30-50 percent premix or as specified for long lifespan with anti-freeze protection–see manual for ratio)
- Socket or wrench to remove water pump drain bolt
- Drain pan
- Funnel
- Compressed air or clean water (if flushing for maintenance)
- Clean rag
- Gloves and eye protection
Changing the Coolant
- Let the bike cool completely. Never remove the radiator cap when hot–pressure can spray hot coolant.
- Locate the radiator cap and water pump drain bolt. The EC 300 radiator cap is generally on the left upper side. The drain bolt is on the water pump cover (right lower engine case), typically the lower-most bolt.
- Position the drain pan beneath the water pump area.
- Remove the radiator cap first to break vacuum and allow coolant to drain quicker.
- Remove the water pump drain bolt. Allow all old coolant to fully drain. Tilting the bike side-to-side can help ensure both radiators are emptied.
- (Optional) Flush the system. If you suspect old coolant residue, refill the system with distilled water and drain again. Repeat until drained water runs clear.
- Inspect the coolant coming out. If you see oil in the coolant or a "sugary" residue around the cap neck, address possible gasket/cap or head issues right away.
- Reinstall the drain bolt securely. Do not overtighten–reference your service manual if unsure.
- Refill with fresh coolant. Using a funnel, slowly fill the left radiator until the coolant reaches the bottom of the filler neck. Allow bubbles to escape as you fill.
- "Burp" the system. Rock the bike and squeeze radiator hoses gently to help remove air pockets. Top off as needed.
- Reinstall the radiator cap. Wipe up any spills.
- Start the engine and let it run briefly. Watch the coolant level in the recovery tank (if equipped) or recheck radiator once cool. Add coolant if needed.
Key EC 300 Owner Tips
- Use high-quality, silicate-free coolant to reduce water pump seal wear and corrosion.
- Monitor for coolant leaks or excessive loss. Persistent loss may point to radiator cap failure or possible head gasket issues, both crucial on the 300cc two-stroke platform.
- Check the radiator cap seal and neck. Residue can prevent proper sealing and lead to overheating–clean thoroughly at every change.
- Avoid mixing coolant types. Stick with the same type after flushing to avoid deposit buildup and cooling inefficiency.
- Maintain change intervals. Replace coolant at least once a season or every 12 months, as recommended for long engine life.
When to Seek Professional Help
If draining the coolant through the water pump drain bolt produces little or no flow, check for blockages in the bolt hole and, if needed, consult a MotoSport Preferred Service Partner for diagnostics. Unusual residues or recurring coolant loss may indicate repairs or more in-depth inspection is necessary.
Changing your coolant with care is a simple but critical step to keeping your 2010 GAS GAS EC 300 performing at its best. Stay ahead of costly repairs with regular, simple maintenance–and enjoy peace of mind every ride.
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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.