How to Change the Coolant in a 2019 Sherco 300 SEF FACTORY

Shop parts for a 2019 Sherco 300 SEF FACTORY Dirt Bike.

The 2019 Sherco 300 SEF FACTORY dirt bike is a standout in enduro and cross-country racing, built with precision engineering and premium components. Keeping your bike’s cooling system maintained is critical—it ensures consistent engine temps for optimal power delivery and reliability. Regular coolant replacement helps prevent corrosion, overheating, and internal damage, so here is a step-by-step MotoSport-exclusive guide to changing your coolant properly on this exact model.

What Makes the 2019 Sherco 300 SEF FACTORY Unique?

- Uses a Minerva Perma Universal D 4 -25°C or equivalent approved coolant. - 1.1-liter cooling system with a radiator bleed screw for bubble-free filling. - Never substitute unapproved fluids or plain water, as this can damage the engine and cooling components.

Tools & Supplies Needed

  • Approved engine coolant (meet manufacturer specs)
  • Metric tool kit including 8mm and 10mm sockets
  • Drain pan/container for old coolant
  • Funnel
  • New gasket for bleed screw (recommended)
  • Shop towels for cleanup

Step 1: Bike Preparation and Safety

  • Ensure the engine is completely cool to avoid burns.
  • Park the bike vertically on a solid, level surface or use a stand.
  • Remove the seat and shrouds if necessary to access the radiator neck and bleed screw.

Step 2: Draining the Old Coolant

  • Locate the coolant drain screw at the base of the water pump or the lowest coolant pipe on the right side. Place a drain pan underneath.
  • Remove the radiator cap to allow airflow for draining.
  • Unscrew the drain bolt and allow the old coolant to drain completely.
  • Properly dispose of the used coolant in accordance with environmental regulations; do not dump it down a drain or on the ground.

Step 3: Inspection – Look for Leaks

  • While the system is empty, inspect the radiators, hoses, and water pump for signs of leakage, corrosion, or wear. Check specifically the water pump’s weep hole for leaks—if the seal is leaking, further disassembly is required.

Step 4: Refitting – Bleed & Fill with Fresh Coolant

  • Install and tighten the drain screw (typical torque is 6Nm; verify on your specific model).
  • Open the radiator bleed screw (M6x8, torque to 8Nm when closing) on the left side of the radiator.
  • Slowly fill the radiator via the radiator neck using a funnel. Continue filling until coolant flows steadily from the bleed screw, with no air bubbles.
  • Replace the bleed screw with a new gasket (recommended for best seal) and torque to specification.
  • Top off the radiator until the coolant is just below the neck.
  • Reinstall the radiator cap securely.

Step 5: Final Steps – Warm-Up & Recheck

  • Start the bike and let it idle until it begins to warm up. Watch the coolant level rise/fall in the overflow tank if equipped.
  • Shut off the engine and let it cool, then recheck the coolant level. Top off as needed.
  • Inspect for leaks and ensure hose clamps and fittings are secure.

Important Tips & Maintenance Notes for Your Sherco

  • Never operate your 300 SEF FACTORY with low or incorrect coolant—this can rapidly overheat the engine and cause severe damage.
  • Change coolant every 1–2 years for best protection, or after significant exposure to mud, sand, or water crossings.
  • If the water pump weep hole shows drips, a shaft seal or bearing replacement is needed—this is more involved and typically requires removal of the clutch housing.
  • Inspect O-rings and gaskets any time you open the cooling system; always replace damaged seals with genuine Sherco parts for best results.

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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.