How to Change the Coolant in a 2019 Sherco 250SEF-R: A MotoSport Guide

Shop parts for a 2019 Sherco 250SEF-R Dirt Bike.

Maintaining the cooling system on your 2019 Sherco 250SEF-R is essential for optimal performance and engine longevity. This unique four-stroke enduro bike features a high-revving powerplant and advanced liquid cooling, making proper coolant maintenance a priority. Below is a MotoSport-exclusive, step-by-step guide to changing the coolant – plus specific tips for your 250SEF-R.

Before You Start

  • Use only approved coolant. Never substitute with water or unapproved fluids; this can severely damage your engine and void warranties.
  • Protect yourself. Coolant is hazardous – wear gloves, avoid contact with skin or eyes, and ensure the engine is cold before starting.
  • Work on a level surface with the bike upright on a stand.

Tools & Supplies Required

  • Quality motorcycle coolant (Minerva Perma Universal D 4 -25C, or equivalent silicate-free)
  • Socket set (for bleed and drain screws)
  • Drain pan
  • Protective gloves & rags
  • New gasket for bleed screw (if needed)

Step-by-Step Coolant Change Procedure

  1. Access the Cooling System
    • Remove the bike's shrouds or panels if necessary to access the radiator and expansion tank.
  2. Drain Old Coolant
    • Position a drain pan beneath the bike's engine.
    • Locate and remove the radiator cap (do this slowly, as residual pressure may be present).
    • Remove the coolant drain bolt, usually located on the water pump or bottom of the engine (consult owner's manual for exact location).
    • Allow all coolant to fully drain – do not rush, as air pockets or residue may remain.
    • Once drained, reinstall the drain bolt and torque to 6Nm.
  3. Flush (If Needed)
    • If the old coolant is contaminated or severe buildup is seen, flush the system with distilled water, drain completely, and repeat as needed.
  4. Refill With Fresh Coolant
    • Remove the radiator bleed screw (M6x8, left side of radiator). Use a new gasket if required, and note torque spec (8Nm).
    • Slowly pour new coolant into the radiator filler neck until it runs bubble-free from the bleed screw opening.
    • Reinstall the bleed screw securely.
    • Continue topping off coolant until the radiator is full, then close the radiator cap.
    • Fill the expansion tank to the LEVEL mark with the same coolant.
  5. Finalize & Check
    • Briefly start the engine and let it idle. Watch for bubbles and check coolant level as air works through the system. Shut off and top up as necessary.
    • Inspect for leaks at the drain, bleed, and hose connections.
    • Take the used coolant to an approved recycling center.

Sherco 250SEF-R Important Notes

  • Never use just water. Only high-quality motorcycle coolant is safe for your 250SEF-R.
  • Watch for air pockets. Trapped air is a common issue with this model and can result in overheating – always bleed the system as described.
  • Regular checks can prevent catastrophic engine damage. Low coolant can rapidly overheat a high-output enduro engine.
  • If you notice coolant leaking from the water pump weep hole, it may indicate a failing water pump seal – prompt repair is essential.
  • Coolant capacity: Approx. 1.1 liters for this model. Do not overfill.

Final Reminders

  • Double-check all fasteners and coolant levels after your first post-change ride.
  • Replace coolant as part of scheduled service intervals, or after any event causing overheating or contamination.

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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.