How to Change the Coolant in a 2018 Sherco 300 SEF FACTORY
Shop parts for a 2018 Sherco 300 SEF FACTORY Dirt Bike.
Regularly replacing the coolant in your 2018 Sherco 300 SEF FACTORY is essential for optimal engine performance and longevity. The Sherco 300 SEF FACTORY features a high-performance four-stroke engine, and using the correct procedures & fluids ensures efficient thermal management, prevents corrosion, and reduces the risk of overheating on the trail or track.
What You Will Need
- Minerva Perma Universal D 4 -25°C or an equivalent high-quality, manufacturer-approved coolant
- Basic hand tools (wrenches, screwdrivers)
- A clean drain pan
- Nitrile gloves (optional for protection)
- New gasket for the bleed screw (recommended)
Step-by-Step Coolant Change Guide
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Preparation
Place the motorcycle upright on a level surface. Make sure the engine is cool to avoid scalding. Remove plastics, skid plate, or any parts obstructing access to the radiator cap, drain bolt, and radiator bleed screw. -
Draining the Old Coolant
Put a suitable drain pan under the bike. Locate the coolant drain bolt (usually at the bottom of the water pump or lower radiator hose). Remove the radiator cap to allow air in – this helps the coolant drain faster. Remove the drain bolt and let the coolant flow into the pan. Allow all fluid to fully drain.
Note: Do not reuse old coolant, and dispose of it responsibly at an approved collection center. -
Flush (Optional, Highly Recommended)
If your coolant appears rusty or contaminated, flush the system with distilled water. Reinstall the drain bolt (tighten to 6 Nm), fill with water, run the engine briefly, then drain again. -
Bleed the System
Locate the radiator bleed screw on the left side of the radiator. Remove the bleed screw and use a new gasket if possible. This step is critical for Shercos to avoid trapped air and potential hot spots. -
Refill with Fresh Coolant
Slowly pour coolant into the radiator until it begins to flow out of the bleed screw hole – this pushes air out of the system. When there are no bubbles and only coolant emerges, reinstall and tighten the bleed screw (8 Nm). Continue adding coolant until the radiator is full (approx. 1.1 liters for this model). -
Final Steps
Replace the radiator cap. Start the engine and let it idle for several minutes with the radiator cap on. Watch for leaks and monitor coolant level by checking the overflow reservoir. After cooling, check coolant level again and top off if needed to the LEVEL mark.
2018 Sherco 300 SEF FACTORY Specifics
- This model requires a high-quality, approved coolant; never substitute with plain water or non-approved fluids to avoid engine damage and corrosion risk.
- Check the system for leaks at the water pump and hoses as the water pump seal is a known wear item. A leak at the weep hole under the water pump signals seal replacement may be needed.
- If you are experiencing frequent overheating or notice coolant loss, inspect radiator fins for clogging and verify the radiator fan operation.
- Always tighten bolts to the specified torque to prevent thread damage.
Maintenance Tip
Replace coolant at least every two years or as recommended by Sherco. Regular inspection and prompt addressing of leaks or overheating ensures the longevity and reliability of your dirt bike’s engine.
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.