How to Change the Coolant in a 2023 Sherco 250 SEF FACTORY

Shop parts for a 2023 Sherco 250 SEF FACTORY Dirt Bike.

Regular coolant changes keep your Sherco 250 SEF FACTORY running cool even in the toughest conditions. This exclusive MotoSport guide details the safest, most effective way to change the coolant, with tips unique to the 2023 SEF Factory model.

Before You Start

  • Use only the recommended coolant–never substitute with water or unapproved fluids, as this can risk engine damage and void your warranty.
  • Coolant capacity for this model is approximately 1.1 liters.
  • Make sure the engine is completely cool before starting the procedure to avoid burns.
  • Put the bike upright on a level surface for accurate filling and draining.

Tools & Supplies

  • Fresh, approved coolant
  • Container for old coolant (dispose of used coolant at an approved facility)
  • Sockets/wrenches (10 mm socket for the water pump, standard sizes for radiator and drain plug)
  • Gloves and rags for safety and cleanup

Step-by-Step Instructions

  1. Remove the Skid Plate (if equipped): This allows better access to the water pump and drain plug.
  2. Locate and Remove the Coolant Drain Bolt:
    • Find the coolant drain bolt on the lower part of the water pump cover (usually labeled as screw [A]).
    • Place your drain pan beneath and remove the drain bolt. Allow all the coolant to drain out completely.
    • Open the radiator cap (left side of the bike) to speed draining.
  3. Flush (Optional):
    • If the old coolant is especially dirty, you can pour a small amount of distilled water into the radiator, replace the cap, start the engine briefly, then repeat the drain procedure.
  4. Reinstall the Drain Bolt:
    • Clean the drain bolt and its seat. Tighten it to 6Nm to ensure a proper seal–over-tightening risks stripping the threads.
  5. Bleed the System:
    • Loosen the radiator bleed screw (left side of the radiator, typically an M6x8 screw with 8Nm torque spec).
    • This is a critical step to remove trapped air pockets, which can overheat your Sherco.
  6. Add New Coolant:
    • With the radiator cap off and bleed screw out, slowly fill the radiator until coolant runs bubble-free from the bleed opening.
    • Reinstall the bleed screw with a new gasket to prevent leaks, torque to manufacturer specs.
    • Continue to fill coolant until it reaches the indicated LEVEL mark in the expansion container.
  7. Check for Leaks & Finalize:
    • Start the engine and let it idle for a few minutes with the radiator cap off. Top off as needed as any remaining air escapes.
    • Reinstall the radiator cap and check the expansion tank once more after the engine cools down again.

Model-Specific Tips for the 2023 Sherco 250 SEF FACTORY

  • The Sherco 250 SEF Factory runs a high-performance cooling system–even small air pockets or using the wrong fluid can cause overheating.
  • Inspect for slow leaks: If coolant is seeping from the water pump weep hole, the water pump seal may need replacement, which requires clutch cover removal.
  • Ensure the bike is always vertical and on firm ground for accurate filling; an uneven bike can cause underfilling or false low readings.
  • Dispose of used coolant responsibly; never pour it down household drains or onto the ground.

Pro Tip

Coolant condition is a great indicator of engine health. If you notice rust or oil contamination in your coolant, further inspection may be needed. Always consult your service manual for torque values and small part replacement, like gaskets and O-rings, for the Sherco 250 SEF Factory.

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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.