How to Change the Coolant in a 2019 Sherco 450 SEF-R

Shop parts for a 2019 Sherco 450 SEF-R Dirt Bike.

Changing the coolant in your 2019 Sherco 450 SEF-R is crucial for maintaining optimal engine temperature and preventing overheating under intense riding conditions. While the process is straightforward, following model-specific steps is essential for both performance and longevity.

What You'll Need

  • Minerva Perma Universal D 4 -25°C or other Sherco-approved coolant
  • Drain pan
  • Socket wrench set
  • Fresh gasket for bleed screw
  • Torque wrench
  • Protective gloves and eye protection

Step-by-Step Coolant Change Procedure

  1. Preparation
    Place your bike vertically on a level surface. Allow the engine to cool completely before beginning. Ensure you have a container positioned under the engine to collect old coolant.
  2. Draining the Old Coolant
    Identify and remove the radiator cap located on the radiator itself. Next, locate the coolant drain bolt at the water pump area and unscrew it. Allow all old coolant to drain into your prepared pan.

    Note: The coolant is toxic–dispose of it at an approved recycling facility.
  3. Bleeding the System
    Remove the small bleed screw (M6x8) usually found on the left side of the radiator. This releases air trapped in the cooling system and ensures a thorough drain.
  4. Reinstall the Drain Bolt
    Use a new gasket on the drain bolt to prevent leaks. Tighten the bolt to the factory torque specification (≈6 Nm) for the 2019 Sherco 450 SEF-R.
  5. Filling with Fresh Coolant
    Slowly pour fresh approved coolant into the radiator filler neck. Continue filling until coolant starts to appear from the loosened bleed screw without any bubbles. Reinstall the bleed screw (with a new gasket) and tighten to 8 Nm.

    Fill the radiator until the coolant level reaches the LINE mark on the radiator neck or expansion bottle. The total system capacity is approximately 1.1 liters.
  6. Finishing Up
    Replace the radiator cap securely. With the bike upright, start the engine and let it idle for several minutes. Gently rev the engine a few times to help circulate coolant and eliminate any air pockets. Shut off the engine and let it cool, then recheck the coolant level and top up if needed.

Model-Specific Tips for the 2019 Sherco 450 SEF-R

  • The cooling system on the 450 SEF-R has a relatively small expansion bottle, so check the level regularly and do not overfill.
  • Always use the recommended Minerva Perma Universal D 4 -25°C or an equivalent coolant that meets Sherco specifications–using unapproved fluids can cause engine damage.
  • Ensure that no coolant residue is left around the connectors and hoses, as leakage often indicates worn gaskets or loose clamps specific to higher-displacement Sherco four-strokes.
  • When reinstalling fasteners, always use new gaskets and o-rings where specified to maintain a proper seal and prevent premature leaks or component failure.

When to Replace the Coolant

  • Sherco recommends changing the coolant at least every two years or after extensive off-road use to maintain system efficiency and avoid corrosion or overheating.
  • Replace coolant immediately if you experience overheating, leaks from the water pump weep hole, or coolant contamination.

Final Notes

  • Double-check the ignition is in the OFF position during service for safety.
  • Use a torque wrench on all critical fasteners to prevent overtightening or stripping threads.
  • Document coolant type and volume for future maintenance logs.

Related Shopping Categories

Shop Radiators for a 2019 Sherco 450 SEF-R Dirt Bike.

Shop Coolant for a 2019 Sherco 450 SEF-R Dirt Bike.

Shop Temperature Sensors for a 2019 Sherco 450 SEF-R Dirt Bike.

Shop Tools for a 2019 Sherco 450 SEF-R Dirt Bike.

Shop Radiator Hoses for a 2019 Sherco 450 SEF-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.