How to Change the Coolant in a 2025 Sherco 300 SE FACTORY

Shop parts for a 2025 Sherco 300 SE FACTORY Dirt Bike.

Routine maintenance on your 2025 Sherco 300 SE FACTORY is essential for top performance and engine longevity. The cooling system, vital for keeping the motor running at optimal temperature, relies on quality coolant. Below, MotoSport.com provides a step-by-step, proprietary guide for changing the coolant on your specific MMY dirt bike, plus model-specific notes every owner should know.

Why Coolant Change Matters

Fresh coolant prevents overheating, corrosion, and internal damage. Never substitute water or non-approved fluids, as they can cause engine damage or void your warranty. Sherco recommends using only approved coolant for this model.

What You Need

  • Manufacturer-approved coolant (approx. 1.1 liters/1.16 quarts)
  • Socket wrench and appropriate sockets
  • Pliers
  • Drain pan
  • Clean rag
  • Replacement sealing washer (for drain bolt)
  • Funnel
  • Top-quality gloves & safety glasses

Preparation

  • Ensure the bike is on a level surface with the engine completely cool.
  • Remove the seat and disconnect the battery.
  • Remove the fuel tank and radiator side panels for easier access.

Steps to Change the Coolant

  1. Locate the Radiator Cap and Drain Bolt
    The radiator cap is on top of the left radiator. The drain bolt is at the bottom of the water pump cover.
  2. Place the Drain Pan
    Set a drain pan directly under the drain bolt to capture old coolant.
  3. Remove the Radiator Cap
    Slowly loosen the cap to release pressure. Remove completely only when pressure is gone.
  4. Remove the Drain Bolt
    Use the socket to remove the water pump drain bolt and sealing washer. Allow all coolant to drain.
  5. Inspect the Washer
    Install a new sealing washer on the drain bolt before reinstallation.
  6. Reinstall the Drain Bolt
    Tighten to manufacturer specifications to prevent leaks.
  7. Refill Coolant
    Using a funnel, pour new coolant into the radiator neck until full (about 1.1 liters for the 2025 Sherco 300 SE FACTORY).
  8. Bleed the Cooling System
    Tilt the bike onto its kickstand and gently rock it side to side. Open the bleed screw if equipped, or slightly loosen a high-point hose to allow trapped air to escape. Top off fluid as needed.
  9. Replace the Radiator Cap
    Secure the cap tightly.
  10. Check for Leaks
    Inspect around the drain bolt and radiator.
  11. Reinstall Fuel Tank, Battery, and Seat
    Reattach all components securely.
  12. Warm the Engine & Recheck Level
    Start and idle the bike until the fan comes on. Let it cool and check coolant level again, topping off if necessary.

Special Notes for the 2025 Sherco 300 SE FACTORY

  • This model features a new, lighter frame and revised cooling system layout for easier maintenance. Double-check the correct coolant volume (about 1.1 L), as the new frame may affect radiator capacity.
  • Access to the airbox, battery, and relays has been improved thanks to the updated airbox design–removal panels make for easier maintenance compared to previous years.
  • Only use manufacturer-specified coolant to ensure protection of new internal gaskets and seals found in this updated model.
  • Pay attention to updated steering head bearings and shock mount points, which may alter routing for coolant hoses compared to earlier models.

Final Tips

  • Dispose of old coolant properly, as it is toxic to people, pets, and the environment.
  • Inspect hoses, clamps, and the radiator for wear or damage during every coolant change.
  • If you detect recurring leaks, consider replacing seals or having a professional inspection, as persistent issues can cause engine damage fast.

Related Shopping Categories

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Shop Tools for a 2025 Sherco 300 SE FACTORY Dirt Bike.

Shop Radiator Hoses for a 2025 Sherco 300 SE FACTORY Dirt Bike.

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.