How to Change the Coolant in a 2018 Sherco 450 SEF FACTORY

Shop parts for a 2018 Sherco 450 SEF FACTORY Dirt Bike.

Maintaining optimal cooling performance in your 2018 Sherco 450 SEF FACTORY is essential for engine longevity and consistent power delivery. Below you'll find a step-by-step guide developed specifically for your model, highlighting key tips and model-specific notes every owner needs to know.

Preparation

  • Ensure the engine is cool to avoid personal injury or engine damage.
  • Place the bike securely on a stand for stability.
  • Have a drain pan, fresh factory-approved coolant, and the appropriate tools ready. Do not use water or non-approved fluidsthis risks engine damage.

Draining the Old Coolant

  • Locate the coolant drain bolt on the water pump cover.
  • Place a drain pan beneath the drain bolt to catch the old coolant.
  • Remove the drain bolt and allow all coolant to completely drain from the system.
  • You may also remove the radiator cap to assist drainage by allowing air into the system.

Inspect Key Components

  • Check the coolant for contamination or signs of oil, which could indicate a failed seal.
  • Inspect the water pump housing and O-ring; replace the O-ring if it shows wear or damage.
  • Verify the drain bolt and washer are in good condition before reinstallation.

Refilling the System

  • Once fully drained, re-install and torque the drain plug to 6 Nm for a reliable seal.
  • Slowly pour factory-approved coolant into the radiator until full. Use only fluids recommended by the manufacturer to protect the system components.
  • With the radiator cap off, gently rock the bike or squeeze hoses to bleed trapped air.
  • Continue topping off until the coolant remains steady at the fill neck.

Final Steps and Bleeding Air

  • Install the radiator cap.
  • Start the engine and allow it to reach operating temperature. Watch the coolant level and check for leaks.
  • Turn off the engine, let it cool, and re-check the coolant level. Top off if needed.

Model-Specific Tips for the 2018 Sherco 450 SEF FACTORY

  • This model uses upgraded coolant fittings–unlike pre-2018 models, there is no known issue with plastic "T" connectors requiring retrofitting.
  • Always double-check that locating pins and paper gaskets (if disturbed) are fresh and correctly installed if you open the water pump housing during a seal change.
  • If leaks are observed around the weep hole, this may signal a water pump seal failure, requiring more advanced service involving removal of the clutch housing and specialized tools for shaft and seal replacement.
  • Coolant changes are a recommended part of regular maintenance to ensure high performance in extreme off-road conditions.

Performing this procedure as part of your regular maintenance routine will help protect your Sherco's advanced engine design and sustain performance ride after ride. If you encounter excessive debris in the old coolant or frequent coolant loss, investigate further for signs of gasket or pump failure, both of which are easily addressed with factory replacement parts.

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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.