How to Change the Coolant in a 2020 Sherco 300SEF-R
Shop parts for a 2020 Sherco 300SEF-R Dirt Bike.
Changing the coolant in your 2020 Sherco 300SEF-R is a vital maintenance step to keep your bike running cool and reliably, especially under hard enduro or aggressive trail riding. This bike uses a pressurized liquid cooling system that is robust but requires regular care. Below you will find a step-by-step guide tailored for your Sherco, with important model-specific tips to ensure you do the job right – and safely – every time.
What You Will Need
- Minerva Perma Universal D 4 coolant (or an equivalent, approved for at least -25°C protection)
- Drain pan
- Socket set (including 10 mm)
- New crush washer or gasket for bleed/drain bolt (recommended)
- Torque wrench
- Protective gloves
- Clean rag
Steps to Change the Coolant
- Let the engine cool completely.
Attempting to open the system when hot can cause burns from pressurized fluid and steam. - Secure the bike upright on a level surface.
The bike should be perfectly vertical to ensure all coolant drains and fills evenly. - Remove the radiator cap and locate the drain bolt.
Unscrew the radiator cap to relieve pressure first, then place your drain pan beneath the water pump area. Locate and remove screw [A] (the coolant drain plug) near the water pump on the left crankcase cover. Allow coolant to fully drain. - Dispose of old coolant properly.
Collect the used coolant and take it to an approved recycling center to protect the environment. - Reinstall and torque the drain bolt.
Use a new gasket or crush washer if needed. Tighten to 6 Nm as specified. - Bleed the cooling system.
Loosen the bleed screw (M6x8) located on the left radiator. Begin pouring new coolant through the radiator cap opening until you see coolant (with no air bubbles) exiting the bleed screw. Then reinstall and torque the bleed screw to 8 Nm. - Fill the radiator.
Continue slowly filling the radiator until the fluid level reaches the "LEVEL" mark inside the expansion container (about 1.1 liters total system capacity). Never overfill. - Replace the radiator cap securely.
- Start the engine and check levels.
Let the motor idle for a couple minutes with the cap on and the bike upright. Shut off and allow the bike to cool, then recheck & top off the coolant if needed.
Important Tips for 2020 Sherco 300SEF-R Owners
- Use only approved coolant types — water or generic antifreeze can damage the magnesium and aluminum in the cooling system.
- The water pump on the 300SEF-R is a critical component. If you notice frequent coolant loss or see coolant from the weep hole, the water pump seal may need replacement, which is a more advanced procedure requiring clutch housing removal and special tools. Routine seal checks are good practice.
- Always ensure gaskets and seals are in good condition to prevent leaks on reassembly.
- This particular model's system is sensitive to air pockets. Take care during the fill & bleed step – make sure there are no trapped bubbles.
Regular coolant changes not only extend the life of your Sherco 300SEF-R but also protect your engine during hard rides. For genuine replacement parts and high-performance accessories specific to your model, see the MotoSport parts catalog for the 2020 Sherco 300SEF-R.
Related Shopping Categories
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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.