How to Change the Coolant in a 2013 GAS GAS EC300: Step-by-Step Guide
Changing the coolant on your 2013 GAS GAS EC300 is a key part of your dirt bike maintenance routine. Proper cooling ensures optimal engine performance and longevity, especially on a high-performance two-stroke like the EC300. This unique MotoSport.com guide walks EC300 owners through the process and highlights important tips specific to your model.
Tools & Supplies
- Phillips screwdriver or 8mm socket (for radiator shrouds as needed)
- 10mm socket and ratchet (for drain bolt)
- Drain pan
- Fresh, high-quality coolant (choose one designed for off-road motorcycles)
- Distilled water (for flushing)
- Funnel
- Gloves and safety eyewear
- Shop towels
Before You Begin
- Ensure the engine is completely cool to avoid burns.
- Work in a well-ventilated area and dispose of used coolant responsibly.
1. Access the Radiators
- If necessary, remove the radiator shrouds using your Phillips screwdriver or 8mm socket. This will allow better access to the radiator cap and hoses.
2. Remove the Radiator Cap
- Locate the radiator cap, found on the top of the left radiator. Slowly turn the cap to the first stop to release pressure, then remove it completely.
3. Drain the Old Coolant
- Identify the coolant drain bolt at the base of the water pump case on the right side of the engine. Position your drain pan underneath.
- Remove the drain bolt using a 10mm socket. Allow all coolant to drain. Tipping the bike gently from side to side helps evacuate more fluid from both radiators.
4. Flush the System (Recommended)
- After draining, reinstall the drain bolt temporarily. Fill the radiators with distilled water.
- Replace the radiator cap, start the bike briefly (15–30 seconds), then turn it off and allow to cool.
- Remove the cap and bolt, drain the rinse water fully. Repeat until clear water drains out.
5. Reinstall the Drain Bolt
- Check the drain bolt washer for wear—replace if necessary.
- Reinstall and tighten to factory spec (do not overtighten).
6. Add Fresh Coolant
- Using a funnel, slowly pour fresh coolant into the radiator until it reaches just below the bottom of the fill neck.
- Tip the bike side to side to encourage air bubbles to escape.
7. Bleed the Cooling System
- With the cap off, gently squeeze the upper radiator hoses to help release trapped air.
- Start the bike and let it idle for 2–3 minutes with the cap off, topping off as needed. Do not let coolant overflow.
- Shut off the engine, top up if necessary, and securely replace the radiator cap.
8. Final Steps
- Reinstall radiator shrouds if removed.
- Wipe up any spills, check for leaks at the drain bolt and hoses.
- Take the bike for a short ride, then re-check coolant level once the bike has cooled down.
EC300-Specific Tips & Notes
- Coolant capacity for the 2013 EC300 is typically just over 1 liter—consult your owner manual for precise measurement.
- Always use coolant formulated for motorcycles, as automotive coolants may lack the right anti-corrosion properties for the EC300's aluminum and magnesium engine components.
- Inspect radiator hoses and clamps during service. The EC300 model is prone to vibration, which can loosen hose clamps or fatigue hoses over time.
- If you ride in extreme conditions or at high altitude, consider swapping to a high-boiling-point coolant for extra thermal protection.
- Avoid overfilling—leaving some expansion space helps prevent overflow as the coolant heats up.
- Check for any visible leaks on the radiators and cap, and ensure your radiator fins are clean and straight for ideal airflow.
By following these steps, you'll keep your 2013 GAS GAS EC300 running cooler, longer and ready for the toughest trails. Regular coolant service is a simple way to protect your investment and get the most power out of 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.