How to Change the Coolant in a 2023 GAS GAS EC 300
Regularly changing the coolant in your 2023 GAS GAS EC 300 keeps your two-stroke enduro engine running cool and reliable. Follow this step-by-step guide tailored for EC 300 owners to refresh your coolant the right way–and note a few model-specific details to maximize engine life and performance.
What You Will Need
- Fresh motorcycle coolant compatible with aluminum engines (avoid plain water or automotive antifreeze)
- 8mm or 10mm socket and ratchet
- Flathead screwdriver
- Catch pan
- Funnel
- Protective gloves and rags
1. Prepare the Bike
- Make sure the engine is completely cool before starting to avoid burns.
- Secure the bike on a stand on level ground.
- Remove the radiator shrouds and any bodywork around the radiators for easier access.
2. Drain the Old Coolant
- Locate the coolant drain bolt on the lower side of the water pump cover (right side of the engine).
- Place your catch pan under the drain bolt.
- Remove the radiator cap first to allow air flow for a complete drain.
- Remove the drain bolt and allow coolant to drain fully. Expect just under a liter to come out.
3. Flush the Cooling System (Recommended)
- To remove any lingering sediment, pour a small amount of distilled water into the radiator and let it drain.
- Repeat until water runs clear. Avoid using tap water, which adds minerals and scale.
4. Reinstall the Drain Bolt
- Replace the drain bolt and torque it to factory spec (typically around 6 Nm or 53 in-lb–double check your owner's manual for exact figure).
5. Add New Coolant
- Slowly pour new coolant into the radiator neck until nearly full. Use a funnel to minimize spills.
- EC 300 radiators have a small bleeder screw located on the top of the cylinder head. Loosen this screw with a flathead carefully as you fill to let trapped air escape.
- Watch for air bubbles at the bleeder–when coolant escapes in a steady stream, tighten the screw.
- Top off with more coolant if necessary and reinstall the radiator cap securely.
6. Check for Leaks & Top Off
- Briefly start the engine and let it idle with the radiator cap on for a minute or two.
- Shut off and let cool. Recheck the coolant level and add more if needed–minor settling is normal as air works out of the system.
- Inspect around the drain bolt, bleeder, and hose connections for leaks.
Things Every 2023 GAS GAS EC 300 Owner Should Know
- Never use pure water or non-motorcycle engine coolant: This engine requires a quality premixed coolant for corrosion protection and freeze/boil-over resistance.
- Bleeding air is critical: Air pockets can cause the EC 300 to overheat. Always use the bleeder on the cylinder head during fills.
- Change interval: GAS GAS recommends changing coolant every 24 months or immediately after heavy mud/muck rides.
- Check radiator fins often: The EC 300s radiators can easily clog with mud or debris on enduro rides–keep them clean to avoid overheating.
By following these focused steps and paying attention to unique EC 300 details, you will keep your bike running cool and ready for the toughest off-road conditions.
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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.