How to Change the Coolant in a 2021 GAS GAS EC 300
Changing the coolant in your 2021 GAS GAS EC 300 is a key part of ongoing maintenance to ensure reliable engine performance and to prevent overheating, especially in demanding off-road environments. Below is a step-by-step proprietary MotoSport method tailored specifically to this model:
What You'll Need
- Fresh recommended coolant (engine ice or high-quality mixed antifreeze safe for aluminum components)
- Catch pan for old coolant
- 8 mm socket or suitable wrench
- Funnel
- Clean rags
- Protective gloves and eye protection
Prep Your Bike
- Make sure the engine is completely cool. Never open the radiator cap or drains when the system is hot or under pressure.
- Park the bike on a steady, level surface, preferably using a stand.
Draining Old Coolant
- Remove the seat and necessary shrouds to access the radiator cap. Open the cap slowly to relieve any remaining pressure.
- Position your catch pan beneath the water pump drain bolt, usually located low on the right side of the engine case.
- Use the socket to remove the drain bolt and allow all coolant to drain into the pan.
- Inspect the coolant for contamination. If it appears rusty or milky, consider inspecting the cooling system further for leaks or head gasket issues.
Refilling the System
- Reinstall the water pump drain bolt. Torque to manufacturer specifications if possible.
- Begin slowly pouring new coolant into the radiator filler neck. Fill until you see coolant reaching the bottom of the neck or as specified in your owner's manual.
- To bleed air from the system, gently rock the bike side-to-side and lightly squeeze radiator hoses.
- If equipped, open the air bleed screw on top of the cylinder head while adding coolant until a steady stream of coolant (no bubbles) comes out, then close the screw securely.
- Replace and secure the radiator cap.
Final Checks
- Run the engine for several minutes, allowing it to reach operating temperature with the bike stationary. Watch for leaks.
- Shut off the engine, let it cool, then remove the radiator cap to check coolant level and top off as needed.
- Reinstall seat and shrouds.
Special Notes for the 2021 GAS GAS EC 300 Owner
- This model uses a two-stroke engine with a liquid-cooled system – proper coolant is crucial to avoid overheating and prevent internal corrosion. Use only coolants compatible with magnesium and aluminum.
- The 2021 EC 300 is equipped with TPI (Transfer Port Injection) which maintains consistent fueling even in extreme temperatures – but running with old or contaminated coolant risks overheating and related engine damage.
- Inspect the radiator hoses for wear and replace if you notice swelling, cracking, or leaks during the process.
- If your bike has an aftermarket radiator fan or temp sensor, verify connections after service.
- Mark down the coolant change in your maintenance log – periodic checks and changes ensure long engine life and peak performance.
Proper cooling system maintenance on your 2021 GAS GAS EC 300 will keep you riding longer and stronger, no matter the terrain.
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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.