How to Change the Coolant in a 2021 Sherco 250 SEF FACTORY
Shop parts for a 2021 Sherco 250 SEF FACTORY Dirt Bike.
Keeping the cooling system in peak condition is critical for the performance and longevity of your 2021 Sherco 250 SEF FACTORY. Changing the coolant regularly helps protect the engine from overheating and corrosion, especially under demanding dirt bike conditions. Here is a step-by-step guide unique to MotoSport that covers draining, flushing, and refilling the coolant, along with key notes specific to your model.
What You Will Need
- Fresh coolant (Minerva Perma Universal D 4 -25°C or approved equivalent)*
- Drain pan or container
- Socket set (for bleed screw & mounting bolts)
- Funnel
- Shop towels
- Torque wrench (recommended for reinstalling screws, 8 Nm for radiator bleed screw)
- Protective gloves & eyewear
*Consult your Sherco manual or dealer if you cannot source the recommended coolant. Do not use water alone; always use a high-performance motorcycle coolant.
Steps to Change Coolant
- Preparation
Make sure the engine is completely cool. Place the bike vertical on a flat, stable surface–the Sherco's coolant system should only be worked on when cold, both for safety and to prevent airlocks when refilling. - Access the System
Remove the radiator and expansion tank caps. Place a drain tray beneath the water pump area. - Drain the Coolant
- Locate the coolant drain screw–on the 250 SEF FACTORY, this is typically found at the base of the water pump cover on the right side of the engine.
- Remove the screw and allow the coolant to drain fully into the pan.
Correct disposal is a must: take the old coolant to an approved recycling center.
- Remove the Bleed Screw
- On the left side of the radiator, locate and remove the bleed screw (M6x8, 8 Nm on installation).
This step is critical for removing air pockets, ensuring a complete system drain and preventing hot spots.
- Flush (If Necessary)
If you suspect contamination (oil, rust, debris), briefly refill with distilled water, run the engine for a minute with the radiator cap off, and drain again. Repeat until clean. - Refill with New Coolant
- Pour the new coolant slowly into the radiator opening until it exits bubble-free from the bleed screw location.
- Reinstall the bleed screw with a new gasket if available. Torque to 8 Nm.
- Continue filling the radiator and the expansion bottle to their respective LEVEL marks.
- Total coolant system capacity is approximately 1.1 liters on this model.
- Check for Air and Final Level
With the bike upright, briefly start the engine with the radiator cap off and keep an eye on the coolant level. Top off as necessary; watch for bubbles at the cap–when they stop, the system is full. - Reinstall Caps and Inspect
Install the radiator and expansion tank caps securely. Check under the bike and around the pump and hoses for leaks. - Warm Up and Recheck
Let the engine idle until warm. Shut it off, let it cool, and recheck coolant levels, topping off as needed.
Special Notes for the 2021 Sherco 250 SEF FACTORY
- Factory models use high-quality hoses and radiators; inspect for abrasions or blockages during service.
- The radiator bleed screw is easy to overlook but crucial. Always bleed air to prevent overheating and inconsistent cooling.
- System uses a pressurized cap–inspect for a proper seal and replace if any damage or leaks are seen.
- Never use hard water or automotive antifreeze not specifically rated for motorcycles, as doing so can cause corrosion or water pump failures.
- Failure to observe correct torque can cause leaks or damage lightweight aluminum components.
When to Change the Coolant
- Every 1-2 years, or annually if the bike is ridden hard or in extreme conditions.
- Anytime you service the water pump or cooling hoses.
- If the coolant has changed color, has visible sediment, or the system has been exposed to contamination.
Proactive coolant maintenance ensures your Sherco 250 SEF FACTORY keeps running at its best on every ride. For genuine parts and tools, Shop parts for a 2021 Sherco 250 SEF FACTORY Dirt Bike.
Related Shopping Categories
Shop Radiators for a 2021 Sherco 250 SEF FACTORY Dirt Bike.
Shop Coolant for a 2021 Sherco 250 SEF FACTORY Dirt Bike.
Shop Temperature Sensors for a 2021 Sherco 250 SEF FACTORY Dirt Bike.
Shop Tools for a 2021 Sherco 250 SEF FACTORY Dirt Bike.
Shop Radiator Hoses for a 2021 Sherco 250 SEF FACTORY 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.