How to change the coolant in a 2020 Sherco 300 SE FACTORY Dirt Bike

How to Change the Coolant in a 2020 Sherco 300 SE FACTORY

Shop parts for a 2020 Sherco 300 SE FACTORY Dirt Bike.

Regular coolant maintenance is crucial for keeping your 2020 Sherco 300 SE FACTORY performing at its best, especially during high-output rides and racing conditions. This particular model features a high-compression four-stroke engine and a sensitive cooling circuit, so following a precise coolant change procedure is non-negotiable for engine longevity and consistent performance. Below, you'll find a proprietary MotoSport step-by-step guide with additional technical notes specific to your Sherco.

What You Need

• Suitable motorcycle coolant (Minerva Perma Universal D 4 -25°C or Sherco-approved equivalent)
• Container for old coolant
• Socket wrench set (notably 10 mm and 8 mm)
• New crush washer/gasket for bleed screw
• Torque wrench
• Shop rags, gloves, and safety glasses

Step-by-Step Coolant Change Guide

1. Preparation
   • Work on a cool engine on a level surface.
   • Stand the motorcycle upright and secure it to ensure full coolant evacuation from the system.
   • Remove the seat and any guards obstructing the radiators if needed.
2. Drain the Coolant
   • Locate the coolant drain screw. On the Sherco 300 SEF engine, this is found at the bottom of the water pump cover. Place your drain pan beneath this point.
   • Loosen the radiator cap to break any vacuum in the system.
   • Remove the drain screw and allow all coolant to drain. Be patient; tilting the bike side to side ensures complete evacuation. Avoid skin contact with old coolant—it is toxic and slippery.
   • Replace the drain screw using a new washer and torque to 6 Nm for a leak-free seal.
3. Flush (Optional but recommended)
   • If the old coolant is discolored or contaminated, flush the system by filling with distilled water, running briefly, then draining as above. Repeat until water runs clear.
4. Fill and Bleed the System
   • Remove the radiator filler cap and the bleed screw (located on the left side of the radiator; M6x8, torqued to 8 Nm on reinstallation).
   • Slowly pour new coolant into the radiator until it flows bubble-free from the bleed screw opening. Refit the bleed screw with a new gasket once only coolant seeps out, not air.
   • Continue filling until the coolant reaches the LEVEL mark on the expansion tank (approx. 1.1 liters total system volume).
5. Final Steps
   • Refit the radiator cap and double-check for leaks.
   • Start the engine and let it idle for a few minutes. Check for leaks at the drain and bleed screws and around hoses. Shut off the engine above normal operating temp and let the bike fully cool. Inspect and top off the expansion tank if necessary, as air pockets may have purged.

Special Notes for 2020 Sherco 300 SE FACTORY Owners

• Only use coolant specified for aluminum engines (avoid water or universal car coolant). Sherco specifies Minerva Perma Universal D 4 -25°C for optimal protection against corrosion and freezing.
• Never run the bike without coolant or allow the system to run dry, as this will cause rapid and severe engine damage.
• Pay attention to cooling system seals. The Sherco water pump shaft seal is critical; leaking seals will create drips from the weep hole behind the pump cover. Replace seals and clutch housing gaskets if leaks are detected, following the precise assembly order and torque specs in your workshop manual.
• For aggressive and extended riding or racing, inspect your coolant condition and level more frequently, as high loads increase the risk of overheating.
• Always dispose of used coolant at an approved collection center—it is highly toxic to both people and animals and illegal to pour down drains.

Stay Ready for Every Ride

Routine coolant changes are the foundation of reliability for your Sherco 300 SE FACTORY. Adhering to the correct method protects your engine, ensures long-lasting seals, and maintains consistent power output when it counts most.

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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.