How to Change the Coolant in a 2020 Sherco 300 SEF FACTORY

Shop parts for a 2020 Sherco 300 SEF FACTORY Dirt Bike.

Keeping your 2020 Sherco 300 SEF FACTORY running cool is essential for performance & longevity. Changing the coolant regularly helps prevent overheating and protects critical engine components. Follow this step-by-step MotoSport guide designed specifically for this model.

What You Need

  • Minerva Perma Universal D coolant or another **approved coolant** rated for at least -25°C
  • Clean container for old coolant
  • Socket set (including 10 mm socket for water pump access, if needed)
  • New radiator bleed screw gasket (recommended)
  • Basic hand tools & rags

Model-Specific Notes

  • The 2020 Sherco 300 SEF FACTORY uses a precise cooling system – never use plain water or non-approved fluids as these can damage your engine or cause corrosion.
  • Capacity is approximately 1.1 liters of coolant.
  • Take special care when draining or bleeding to avoid air trapped in the system.

Step-by-Step Coolant Change

  1. Park and Prepare
    Make sure the bike is completely cool.
    Place it on a level surface with the bike upright (use a center or paddock stand if available).
  2. Access Radiator & Cooling System
    Remove the radiator cap slowly to release any residual pressure.
    Find the coolant drain screw – typically located at the lowest point of the water pump housing (refer to your service manual or look for a dedicated drain plug marked on the engine case).
  3. Drain Old Coolant
    Position your container underneath the bike to catch old coolant.
    Unscrew the drain bolt and allow all coolant to empty. Open the radiator cap (if not already) to improve flow. Wait until draining slows to a drip.
  4. Bleed the Radiator (Remove Air)
    Locate the small radiator bleed screw on the left radiator.
    Loosen the bleed screw.
  5. Refill with Fresh Coolant
    Slowly pour new coolant into the radiator filler neck.
    Watch for coolant to flow out of the bleed screw hole – this ensures trapped air escapes. When a steady, bubble-free stream emerges, install the new gasket (if needed), then retighten the bleed screw (8 Nm torque).
  6. Top Up to Level Mark
    Continue filling until coolant reaches the recommended level inside the radiator or reservoir. The expansion tank should be filled to the "LEVEL" mark.
  7. Reassemble & Double-Check
    Reinstall all parts and make sure all caps, bolts, and hoses are secure and tight.
    Clean any spilled coolant and dispose of the old coolant at an approved recycling location.
  8. Start & Check
    Start the engine with the radiator cap off and let it idle for a few minutes. Watch for bubbles – add more coolant as air escapes. Once the level stays steady, install the radiator cap securely.
  9. Final Inspection
    After your first ride, re-check coolant levels with the bike cool and top up as needed. Inspect for any leaks around drain, bleed, and hose connections.

Important Reminders for Sherco 300 SEF FACTORY Owners

  • Never overfill the system. Overfilling can create excess pressure or cause leakage.
  • If you notice coolant leaking from the water pump weep hole, the water pump shaft seal may be failing and should be inspected and replaced promptly. This replacement requires removal of the clutch housing and careful attention to seal orientation. Always use a new gasket and follow proper torque specifications for all bolts.
  • Do not neglect coolant changes – old or contaminated coolant can cause overheating and engine damage, especially under hard riding conditions.

Stay on top of regular maintenance to keep your 2020 Sherco 300 SEF FACTORY delivering race-level reliability on every ride.

Related Shopping Categories

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Shop Tools for a 2020 Sherco 300 SEF FACTORY Dirt Bike.

Shop Radiator Hoses for a 2020 Sherco 300 SEF 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.