How to Change the Coolant in a 2023 Sherco 300SE-R

Shop parts for a 2023 Sherco 300SE-R Dirt Bike.

Regularly changing the coolant in your 2023 Sherco 300SE-R is key to keeping your bike’s engine running cool and protected against corrosion. Here’s a step-by-step guide tailored for your model, including essential tips unique to the Sherco 300SE-R platform.

What You’ll Need

  • Quality motorcycle coolant (Minerva Perma Universal D 4 -25°C or equivalent)
  • Container for old coolant
  • Socket wrench set
  • New radiator bleed screw gasket (recommended)
  • Torque wrench (for reassembly)

Important: Special 300SE-R Notes

  • The Sherco 300SE-R has a radiator bleed screw on the left side for thorough air removal – do not skip this step for optimal cooling.
  • Only refill with the recommended coolant; improper fluids can reduce corrosion protection and cooling performance.
  • The radiator is designed for approximately 1.1 liters of coolant. Overfilling or underfilling can affect engine performance.–1

Step-by-Step Coolant Change Process

  1. Preparation
    • Ensure the bike is cold and upright on a level surface for a safe and accurate fill.
    • Remove the seat and side panels if needed for easier radiator access.
  2. Drain the Old Coolant
    • Place your drain container under the bike.
    • Remove the radiator cap to allow quicker draining.
    • Locate and remove the coolant drain screw (usually at the bottom of the water pump casing); let all fluid escape.
    • To fully drain, remove the radiator bleed screw (M6x8, left side of radiator).
    • Properly dispose of used coolant at an approved recycling center.
  3. Inspect and Replace Seals
    • Inspect the condition of the bleed screw and gasket. Always use a new gasket to prevent leaks upon reassembly.–1
  4. Refill with Fresh Coolant
    • Install the drain screw and torque it to 6Nm.
    • With the bleed screw still removed, slowly pour coolant into the radiator until it starts escaping air-free from the bleed screw opening.
    • Replace the bleed screw (torque to 8Nm) with a new gasket.
    • Continue filling until the coolant reaches the full mark in the radiator or expansion tank (approx. 1.1 liters).
  5. Final Steps
    • Reinstall the radiator cap securely.
    • Reassemble the seat and side panels if removed.
    • Start the engine and let it reach operating temperature; watch for leaks and top off coolant as needed after the engine cools.

Extra Sherco 300SE-R Owner Tips

  • Bleeding air is critical; trapped air can cause overheating and hot spots in the cylinder head.
  • Maintain coolant according to your owner’s manual intervals, or after any major engine work.
  • If coolant is found leaking from the weep hole at the water pump, further inspection and a seal replacement are needed – a detailed task best handled with service manual guidance.–2

Stay on top of coolant maintenance and your Sherco 300SE-R will reward you with reliable high performance on 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.