How to Change the Coolant in a 2020 Sherco 450 SEF FACTORY

Shop parts for a 2020 Sherco 450 SEF FACTORY Dirt Bike.

Routine coolant changes are essential to keeping your 2020 Sherco 450 SEF FACTORY running cool – and protecting the high-performance engine from overheating and internal corrosion. Follow this MotoSport-exclusive step-by-step guide for draining and refilling the coolant system. We also highlight model-specific details that every owner should know.

Tools and Supplies Needed

  • Metric socket set and wrenches
  • Large drain pan
  • Recommended coolant (Motul Motocool Factory Line –35°C or equivalent)
  • Funnel
  • Clean shop towels
  • Protective gloves and eyewear

Preparation

  • Make sure your engine is completely cool before starting.
  • Place the bike upright on a level surface using a stand.
  • Remove any plastics necessary to access the radiator cap and drain bolt.

Draining Old Coolant

  • Place a drain pan beneath the water pump on the right side of the engine.
  • Slowly loosen & remove the radiator cap to prevent splashback.
  • Remove the coolant drain bolt located on the water pump cover. Let the coolant drain fully.
    Note: Dispose of used coolant properly at a recycling center.
  • If equipped, loosen the bleed screw on the cylinder head or the highest point in the cooling circuit to let air escape and ensure complete draining.

Refilling With New Coolant

  • Install and tighten the drain bolt to 6 Nm (do not over-tighten).
  • Use a funnel to pour fresh coolant into the radiator until it reaches the "LEVEL" mark inside the radiator neck or as specified in your owner’s manual.
  • If your Sherco uses a bleed screw, loosen it while filling until coolant escapes without air bubbles, then retighten.
  • Replace and secure the radiator cap.

Final Steps

  • Start the engine and let it idle for several minutes. Squeeze the radiator hoses periodically to help air escape.
  • Shut off the engine and let it cool.
  • Recheck coolant level and top off if necessary.
  • Inspect for leaks at the drain bolt, hoses, and radiator cap.

Important Model-Specific Notes for 2020 Sherco 450 SEF FACTORY

  • Always use a coolant compatible with aluminum engine components and rated for motocross applications.
  • This bike’s cooling system is pressurized – releasing the cap when hot can cause burns. Let the engine cool fully before removing the radiator cap.
  • If you notice coolant leaking from the weep hole underneath the water pump, the seal may be failing – replace it promptly to prevent engine damage.
  • The system capacity is small compared to some larger dual-sports, so check your coolant level regularly and inspect for signs of overheating after aggressive riding.

Why Regular Coolant Changes Matter

  • Old coolant can lose its corrosion inhibitors, putting your cylinder head, water pump, and radiators at risk.
  • Changing coolant every 1–2 years or per the service schedule helps protect performance and extends engine life.

Keep your 2020 Sherco 450 SEF FACTORY in prime condition by staying current on service – and get all the genuine parts and accessories you need at MotoSport.

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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.