How to change the coolant in a 2020 Sherco 250SEF-R Dirt Bike

How to Change the Coolant in a 2020 Sherco 250SEF-R

Shop parts for a 2020 Sherco 250SEF-R Dirt Bike.

Regularly changing the coolant in your 2020 Sherco 250SEF-R is essential for optimal engine performance and longevity. This guide walks you through changing the coolant, while highlighting what's unique to this particular model so you can confidently maintain your dirt bike's cooling system.

What Makes the 2020 Sherco 250SEF-R Cooling System Unique?

• The 250SEF-R uses a high-performance closed cooling system designed for extreme off-road use; overheating can quickly damage sensitive engine components if not properly maintained.
• The recommended coolant is a high-performance, ready-mixsuch as Minerva Perma Universal D 4rated for temperatures down to -25°C.
• It is critical for this model to eliminate all air pockets when refilling, as even a small trapped air bubble can cause overheating and potential engine damage.

Required Tools & Supplies

• New coolant (approximately 1.1 liters; see above for type recommendation)
• Catching container for old coolant
• Socket set (for bleed screw and drain/bleed plugs)
• Protective gloves & safety goggles
• New gasket or O-ring for the bleed screw (if required)
• Clean rags

Step-by-Step Coolant Change Procedure

1. Preparation
   Ensure the bike is fully cold before starting to avoid burns. Park it vertically on a level surface. Place your coolant catch container underneath the engine.
2. Draining the Old Coolant
   
   • Remove the radiator cap to allow the system to vent.
   • Remove the coolant drain bolt (usually found at the water pump housing or low point of the system), and allow the coolant to fully drain into the catch container.
   • For complete draining, also remove the radiator bleed screw located on the left side of the radiator.
   • Dispose of used coolant responsibly at an authorized recycling centerit is toxic and harmful to the environment.
3. Inspect Components
   Check hoses, clamps, and the condition of the radiator cap. If you notice signs of leaks (such as coolant at the weep hole), inspect your water pump shaft seal before refilling, as a failed seal can lead to coolant loss and engine damage.
4. Filling with New Coolant
   
   • Install and torque the coolant drain plug (6Nm is standard for this model).
   • With the bleed screw still removed, slowly pour new coolant into the radiator until it flows bubble-free from the bleed screw opening. Trapped air can cause major engine problems, so do not skip this step.
   • Reinstall the bleed screw with a new gasket if necessary (8Nm torque spec if noted).
   • Continue topping off coolant until it reaches the "LEVEL" mark in the expansion reservoir.
5. Final Steps & System Check
   
   • Reinstall the radiator cap securely.
   • Start the engine and allow it to idle, monitoring for leaks. Watch the coolant levelit will likely drop slightly as remaining air escapes. Switch off the engine, let it cool, and top the coolant to the correct level as needed.

Pro Tips & Safety Notes for 250SEF-R Owners

• Never open the radiator cap when the engine is hot—pressurized coolant can spray out and cause severe burns.
• Always use the recommended coolant formulation. Never substitute with pure water or non-approved fluids—they can corrode the aluminum components and cause pump or gasket failures.
• Check your cooling system after your first ride post-change to ensure system integrity and correct coolant level.
• If you repeatedly lose coolant or find signs of oil in the coolant (or vice versa), inspect the water pump assembly for seal failure.

By following these steps, you can maintain the high-performance cooling system of your Sherco and enjoy maximum reliability, even in challenging off-road conditions. Routine coolant changes are the best insurance for your engine's long-term health.

Related Shopping Categories

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Shop Radiator Hoses for a 2020 Sherco 250SEF-R Dirt Bike.

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.