How to Change the Coolant in a 2019 Sherco 300SEF-R: Step-by-Step Guide
Shop parts for a 2019 Sherco 300SEF-R Dirt Bike.
Maintaining optimal coolant performance in the 2019 Sherco 300SEF-R is crucial for engine protection and maximum riding performance. Performing a coolant change ensures efficient temperature regulation and prevents costly internal damage. Below is a proprietary MotoSport guide tailored for Sherco 300SEF-R owners.
What Makes the 2019 Sherco 300SEF-R's Cooling System Unique?
The 2019 Sherco 300SEF-R uses a high-performance, closed liquid cooling system specifically designed for intense off-road conditions. The system is sensitive to proper coolant specification–only use high-quality fluid such as Minerva Perma Universal D 4 rated to -25°C, and avoid all substitutes including plain water, as they risk internal damage–critical for maintaining engine warranty.
Tools & Supplies Needed
- High-quality, model-approved coolant (Minerva Perma Universal D 4 or equivalent)
- Container for used coolant
- Socket and wrench set (including 10 mm socket)
- Screwdriver
- New gasket for bleed screw, if needed
- Clean rags
1. Preparation
- Make sure the bike is completely cold before starting.
- Stand the motorcycle upright on a level surface, using a stand if available.
- Remove any bodywork obstructing access to the radiator cap and coolant drain area.
2. Draining the Old Coolant
- Place a catch container beneath the engine near the coolant drain screw.
- Locate the coolant drain screw on the lower section of the water pump cover (screw [A]).
- Remove the radiator cap to release pressure.
- Loosen and remove the drain screw. Allow the coolant to flow out completely—caution, old coolant is hazardous. Deposit it at an approved collection center.
3. Bleeding the System
- On the left side of the radiator, locate the M6x8 radiator bleed screw. Remove it; keep a new gasket ready.
4. Filling with New Coolant
- Slowly pour fresh coolant into the radiator neck until you see fluid escaping air-free from the bleed screw opening.
- Once air bubbles stop, reinstall the bleed screw using a new gasket and torque to 8 Nm.
- Continue topping off coolant until it reaches the LEVEL mark in the expansion container. Typical fill volume is approximately 1.1 liters.
- Replace the radiator cap securely.
5. Final Checks
- Start the motorcycle and let it idle for several minutes while observing the coolant level and checking for leaks.
- Shut off the engine and allow it to cool. Recheck and, if necessary, top up the coolant to the LEVEL mark.
- Dispose of old coolant in accordance with environmental regulations.
Owner Tips & Notes
- Never use plain water or any non-approved coolant–it can cause internal corrosion, overheating, and premature failure.
- The Sherco 300SEF-R cooling system must be kept fully air-free; always use the bleed screw procedure to avoid air pockets.
- If you notice coolant leaking from the weep hole on the water pump, immediate inspection is required. A leaking seal indicates the need for water pump or seal replacement, which involves more advanced mechanical work including clutch housing removal. Always use new gaskets and seals upon reassembly to maintain a leak-free system.
Changing the coolant in your 2019 Sherco 300SEF-R isn’t just maintenance—it's essential to long-term engine health and peak off-road performance. For all replacement gaskets, coolants, or specialty tools, rely on MotoSport for original fitment and quality assurance.
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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.