How to Change the Coolant on a 2021 Sherco 500 SEF FACTORY

Shop parts for a 2021 Sherco 500 SEF FACTORY Dirt Bike.

Changing the coolant in your 2021 Sherco 500 SEF FACTORY is an essential maintenance task that ensures optimal engine temperature regulation and long-term reliability. Follow the steps below for a complete and safe coolant replacement, and review the important model-specific notes to protect your investment.

Preparation

  • Ensure the engine is completely cool before beginning–working with hot coolant can cause severe burns.
  • Place the bike upright on a level surface.
  • Wear protective gloves and safety glasses.
  • Gather a drain pan, appropriate coolant (Sherco recommends a -35°C rated Factory Line coolant), a clean funnel, and a set of basic hand tools.

Draining the Old Coolant

  • Locate the radiator cap and the drain bolt near the bottom of the water pump area.
  • Loosen the radiator cap to release pressure.
  • Position your drain pan under the water pump. Remove the drain bolt and allow the coolant to drain completely.
  • Inspect the drained coolant for signs of oil, rust, or debris–if any are present, your cooling system may need more thorough service.

Flushing the System (Optional but Recommended)

  • Reinstall the drain bolt and add distilled water to the system.
  • Start the engine and let it run for a few minutes, then shut it off and repeat the draining process.
  • This helps remove sediment and residual old coolant.

Refilling with New Coolant

  • Make sure the drain bolt is tightened securely before adding new coolant.
  • Slowly pour the recommended coolant into the radiator using a funnel, filling until it reaches the base of the filler neck.
  • Check the expansion tank and fill to the LEVEL mark indicated on the container.
  • Replace and secure the radiator cap.

Bleeding Air from the Cooling System

  • Start the engine and allow it to idle until it reaches operating temperature. Watch for air bubbles escaping from the radiator or expansion tank.
  • Shut the engine off, let it cool to ambient temperature, and recheck coolant levels in both the radiator and expansion tank–top off if needed.
  • Repeat this cycle until no more air bubbles appear and levels remain stable.

Final Checks and Tips

  • Visually inspect for leaks around hoses, the water pump, and radiator. Tighten clamps if needed.
  • Use only Sherco-approved coolant; avoid substituting with water or automotive products as they can cause engine damage or corrosion.
  • If coolant drops below the LEVEL indicator between service intervals, check for leaks or overheating issues promptly.

About the 2021 Sherco 500 SEF FACTORY Cooling System

  • This model comes with a high-performance liquid cooling system designed specifically for off-road endurance and heat demands.
  • Always service when the bike is cold to avoid hot fluid exposure and ensure an accurate level check.
  • Pockets of trapped air are especially harmful on this engine–follow the bleeding procedure carefully to prevent overheating.
  • Deposit old coolant at an approved collection center to protect the environment.

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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.