How to Change the Coolant on Your 2018 Sherco 250SE-R: Step-by-Step Guide
Shop parts for a 2018 Sherco 250SE-R Dirt Bike.
Maintaining the cooling system on your 2018 Sherco 250SE-R is critical to protect your engine and ensure peak performance on any terrain. Following the right procedure and using approved fluids will keep your dirt bike running cool, even in the toughest conditions. Here is MotoSport's exclusive, easy-to-follow guide for a successful coolant change tailored to the Sherco 250SE-R.
What You'll Need
- Fresh approved coolant: Minerva Perma Universal D 4 (good for as low as -25°C)
- Catching container for old coolant
- Protective gloves
- Basic hand tools (screwdriver and appropriate sockets)
- New sealing washer/gasket (recommended for the bleed screw)
- Shop rags
Instructions
- Position the Bike
Place your 250SE-R upright on a solid, level surface. This is important to ensure a complete drain and accurate refill. - Drain the Old Coolant
After ensuring the engine is fully cool, position your drain container beneath the bike. Carefully remove the radiator cap (cap 1) and the drain screw (screw 3). Allow all coolant to drain completely.
Note: Take care. Coolant is hazardous—avoid contact with skin and eyes. Dispose of old coolant responsibly at an approved collection site. - Bleed the System
Locate and remove the bleed screw (screw 2, left side of the radiator). This step ensures any trapped air escapes so your system can fill completely with the new coolant. - Refill the Cooling System
Slowly pour new coolant into the radiator through the cap opening. Keep adding until coolant begins to flow without bubbles from the bleed screw hole. Once you have a steady, bubble-free flow, reinstall the bleed screw using a new gasket and tighten to 8Nm (M6x8 size). - Fill to Proper Level
Continue filling the radiator until the coolant reaches the designated level (approximately 1.1 liters for the 250SE-R). Replace the radiator cap securely.
Double-check the expansion (overflow) bottle as well, topping off to the owner's manual LEVEL mark if needed. - Run the Engine and Recheck
Start the bike with the radiator cap on. Let it reach operating temperature so the new coolant circulates fully. Shut off, allow to cool, and verify the level remains correct. Top off if needed.
Special Notes for the 2018 Sherco 250SE-R Owner
- This model features a lightweight, high-performance cooling system with aluminum radiators. Ensuring no air remains trapped is critical—an air pocket can lead to overheating and engine damage.
- Always use an approved, premixed coolant (not just water or generic antifreeze) to avoid corrosion and maintain winter protection.
- Recommended coolant: Minerva Perma Universal D 4.
- Inspect the radiator cap and hoses for wear or leaks during the service. A worn seal or brittle hose can result in coolant loss on the trail.
Pro Tip
Flush the system before filling if the coolant appears rusty or contaminated, or if the bike's service history is unknown. Proprietary descaling and flushing agents formulated for motorcycle engines can help remove deposits.
Keep your 2018 Sherco 250SE-R in top running condition by following this maintenance routine at least once a year, or more often for harsh riding environments. A properly serviced cooling system is the key to reliable, race-ready performance.
Related Shopping Categories
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Shop Radiator Hoses for a 2018 Sherco 250SE-R 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.