How to Change the Coolant in a 2022 Sherco 300SE-R

Shop parts for a 2022 Sherco 300SE-R Dirt Bike.

Regular coolant change is vital for keeping your 2022 Sherco 300SE-R twin-stroke engine running at optimal temperatures and preventing corrosion and overheating. The following proprietary MotoSport guide ensures a safe, thorough, and model-specific procedure for this particular bike and helps you avoid common mistakes that can damage sensitive engine components.

What You Need

  • Approved motorcycle coolant with anti-freeze properties (avoid water or non-approved fluids)
  • Metric socket and wrench set
  • Drain pan for old coolant
  • New M6x8 radiator bleed screw gasket (recommended)
  • Shop rags, safety gloves & eyewear

Before You Begin

  • Make sure the engine is cool to the touch to prevent burns.
  • Ensure the dirt bike is upright on a stand or level surface.
  • Work in a well-ventilated area and dispose of old coolant responsibly at an approved facility–coolant is toxic and contaminates groundwater if not handled correctly.

Step-by-Step Coolant Change on the 2022 Sherco 300SE-R

  1. Remove the Seat and Tank (if desired): For easier radiator cap and bleed screw access, you may want to remove the seat and/or fuel tank.
  2. Locate the Coolant Drain Screw: Place a catch pan underneath the engine. Find the drain screw at the lower section of one radiator, typically marked or called out in the service manual for the 300SE-R.
  3. Remove the Radiator/Expansion Cap: Slowly unscrew the cap to release any pressure in the system.
  4. Drain the Old Coolant: Remove the drain screw and allow all coolant to drain out. Inspect the removed screw; replace the gasket if worn for a proper seal on reinstallation.
  5. Air Bleed Procedure: On the 2022 Sherco 300SE-R, there is a specific bleed screw on the left radiator. Remove this as you refill to let trapped air escape, preventing hot spots and overheating.
  6. Refill the System: Pour the recommended coolant (Minerva Perma Universal D 4 or equivalent, rated for at least -25°C) into the radiator until you see it appear at the bleed screw hole with no more bubbles. Tighten the bleed screw with a new gasket to 8Nm torque.
  7. Finish Filling: Keep adding coolant until the level reaches the max marking (about 1.1 liters for this model). Refit and tighten the radiator/expansion cap.
  8. Run the Engine and Check Levels: With the radiator cap secured, start the engine and let it idle for a few minutes. Shut off the engine, allow it to cool, and recheck the coolant level. Top off if needed.

Model-Specific Notes for the 2022 Sherco 300SE-R

  • This bike uses a pressurized cooling system–never open the radiator cap when the engine is hot.
  • Check hoses, clamps, and all connections after filling to detect leaks.
  • Always use the correct coolant–using plain water or car-specific coolants can cause severe engine damage.
  • To help air escape, carefully rock the bike side-to-side and gently squeeze radiator hoses during initial fill.
  • Inspect your radiator for trail damage; the 300SE-R's position and design leave it exposed, so fit guards if you ride rocky terrain.

Final Checklist

  • Confirm both the drain and bleed screws are fully tightened to specification.
  • Coolant level remains steady after a short ride and cool-down.
  • No leaks, drips, or strong coolant odor indicate a sealed and healthy system.

Keep your Sherco 300SE-R performing flawlessly with scheduled maintenance—and remember, MotoSport is your home for genuine parts, high-quality coolant, and must-have protective accessories for every ride.

Related Shopping Categories

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Shop Tools for a 2022 Sherco 300SE-R Dirt Bike.

Shop Radiator Hoses for a 2022 Sherco 300SE-R 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.