How to Change the Coolant in a 2019 Sherco 250SE-R

Shop parts for a 2019 Sherco 250SE-R Dirt Bike.

Changing the coolant in your 2019 Sherco 250SE-R is essential maintenance that keeps overheating at bay and prolongs the life of your high-performance enduro machine. The 250SE-R uses a liquid-cooled, high-revving four-stroke engine, meaning consistent cooling is critical for both performance and reliability. Follow these step-by-step instructions to ensure a safe and thorough coolant change for your Sherco.

Tools – Supplies You'll Need:

  • Drain pan (for old coolant)
  • Socket set (to remove drain and bleed screws)
  • Fresh coolant (OEM recommendation: Minerva Perma Universal D 4 -25°C or equivalent)
  • Funnel
  • Rags and nitrile gloves
  • Torque wrench

Step 1: Prepare the Bike

  • Ensure the bike is cool to the touch – never open the radiator cap on a hot engine to avoid burns or injuries.
  • Make sure the bike is upright and stable on a level surface. This provides accurate draining and prevents spills.

Step 2: Drain the Old Coolant

  • Locate the radiator cap and loosen it to allow atmospheric air in (do not remove yet).
  • Position your drain pan beneath the engine area, under the coolant drain bolt. On the Sherco 250SE-R, the drain screw is at the base of the water pump housing. Remove the drain screw to let the coolant flow out completely – be patient as it drains (capacity is about 1.1 liters).
  • Remove the radiator cap fully to ensure all coolant exits. Dispose of old coolant properly at a recycling center, as it is toxic for both humans & the environment.

Step 3: Bleed the Cooling System

  • The Sherco features a bleed screw located on the left side of the radiator. Unscrew this carefully.
  • This step is essential to remove any trapped air, which can cause hot spots or engine damage (air in the system reduces cooling efficiency).

Step 4: Fill with Fresh Coolant

  • Using a funnel, begin to pour fresh coolant into the radiator through the fill neck.
  • Watch the bleed screw opening; as coolant starts to flow through without bubbles, immediately replace and tighten the bleed screw (torque: M6X8, 8 Nm).
  • Continue filling until the coolant reaches the "LEVEL" mark on the expansion tank or right at the radiator neck, depending on how your bike is equipped.

Step 5: Final Checks – Run the Engine

  • Replace the radiator cap and clean up any spilled fluid.
  • Start the engine and let it idle for a few minutes, allowing the coolant to circulate fully and any remaining air pockets to work their way to the top.
  • Shut off the engine and let it cool completely. Recheck the coolant level in the expansion tank or radiator. Top off as needed.
  • Always inspect for leaks around drain and bleed screws and the pump housing.

Owner Tips for the Sherco 250SE-R

  • The 2019 Sherco 250SE-R has a compact, high-performance water pump and robust cooling system designed for hard enduro use – a healthy coolant system is critical for reliability in demanding conditions.
  • If you notice frequent coolant loss or residue under your bike, inspect the water pump seal. Leakage at the weep hole may signal a worn seal – replacement requires clutch housing removal, so monitor closely for drips or moisture around the water pump.
  • Always use a fresh O-ring or gasket on drain, bleed, and water pump screws to prevent leaks. Tighten fasteners to specified torque values to avoid stripping or damaging threads.
  • Never mix coolant types; always use high-quality ethylene glycol-based coolant compatible with aluminum engines and radiators.

Environmental Safety

  • Never dump used coolant down any drains or onto the ground. Collect it in a sealed container and take it to an authorized recycling center.

By maintaining the coolant in your 2019 Sherco 250SE-R, you protect your motor against overheating and corrosion, ensuring peak performance whether you're trail riding or pushing your limits in the woods.

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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.