How to Change the Coolant in a 2024 Sherco 300 SEF FACTORY

Shop parts for a 2024 Sherco 300 SEF FACTORY Dirt Bike.

Changing the coolant in your 2024 Sherco 300 SEF FACTORY is an essential maintenance procedure that helps ensure reliable cooling performance and long engine life. This guide will walk you through the process, emphasizing key points specific to this model based on Sherco service documentation and model-specific factors every owner should consider.

What Makes the 2024 Sherco 300 SEF FACTORY Unique?

  • High-performance engine: Maintains optimal operating temperature, especially under enduro and off-road conditions.
  • Precision cooling system with a robust water pump—requires specific attention to torque values and correct seal installation.
  • Engineered for competition, meaning scheduled maintenance is critical for peak performance.

Tools & Supplies Needed

  • Basic socket set (10mm recommended for impeller)
  • Drain pan
  • Funnel
  • New coolant compatible with aluminum engines (consult your manual for coolant type)
  • Torque wrench (6Nm for drain plug, 10Nm for water pump housing screws)
  • New sealing washer for drain bolt (recommended)
  • Optional: Distilled water for flushing
  • Shop towels

Steps to Change Coolant

  1. Let the motorcycle cool completely before starting this service.
  2. Remove necessary bodywork and access the radiator cap to relieve system pressure. Remove the radiator cap slowly.
  3. Locate and Remove the Coolant Drain Bolt: On the 300 SEF FACTORY, the drain bolt is typically found on the lower water pump cover. Place a drain pan underneath and remove the bolt to drain the old coolant completely.
    Torque spec upon reinstallation: 6Nm for the drain plug.–Sherco workshop manual
  4. Flush the system (optional but recommended): Reinstall the drain bolt and fill the radiator with distilled water. Run the bike briefly, then drain again. This removes residues and old coolant.
  5. Inspect cooling system components: Check for leaks at gaskets, pump housing, and hoses. If there is evidence of water pump seal failure (coolant visible at weep hole), consult the manual for seal replacement procedures—changing the seal on this engine requires clutch housing removal and special tools.
  6. Refill with new coolant: Remove the radiator cap again and fill with approved coolant. Fill slowly to prevent air pockets.
  7. Bleed the cooling system by gently rocking the bike side-to-side and slowly squeezing hoses, ensuring no air remains in the system.
  8. Reinstall radiator cap securely after all air has been bled from the system.
  9. Run the engine to operating temperature with the radiator cap installed. Check for leaks and proper coolant circulation.
  10. Once cool, recheck coolant levels and top off if necessary.

Additional Sherco 300 SEF FACTORY Owner Notes

  • Always use a new sealing washer on the drain bolt to prevent leaks.
  • Do not overtighten the drain plug or pump cover—use specified torque.
  • If your bike overheats or repeatedly loses coolant, inspect the water pump and consider a professional inspection for a faulty seal or bearing.
  • Genuine parts like pump seals, gaskets, and correct coolant specification are critical due to the tolerances and high-performance nature of the SEF FACTORY engine.

Keeping your 2024 Sherco 300 SEF FACTORY running cool is a key part of enjoying your ride and maximizing its life. Routine coolant changes prevent corrosion, scale build-up, and overheating—especially vital for enduro conditions.

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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.