How to Change the Coolant in a 2023 Sherco 125SE-R

Shop parts for a 2023 Sherco 125SE-R Dirt Bike.

Keeping your 2023 Sherco 125SE-R running at peak performance means regularly maintaining your cooling system. Changing the coolant ensures optimal engine temperature, prevents corrosion, and supports the long-term reliability that serious riders demand. Here is a complete, model-specific guide for changing the coolant on your 125SE-R.

What You Will Need

  • Motocool Factory Line or a high-quality coolant compatible with aluminum engines
  • 8mm and 6mm sockets or wrenches
  • Drain pan
  • Funnel
  • Clean rags
  • New gasket for the drain/bleed screw (recommended)
  • Protective gloves and eye protection

Instructions

1. Allow the Engine to Cool

Ensure the engine is completely cool before starting. Hot coolant can cause severe burns.

2. Remove Skid Plate and Access Radiator

For easier access, remove the skid plate if fitted. Set the bike on a level surface using the side stand.

3. Drain the Old Coolant

  • Locate the coolant drain (bleed) screw on the lower portion of the right radiator or the cylinder head.
  • Place a drain pan under the bike.
  • Remove the radiator cap to allow air into the system for a quicker drain.
  • Carefully loosen and remove the drain screw using a 6mm hex or 8mm socket. Allow coolant to fully drain into the pan.
  • Inspect and, if necessary, replace the gasket on the drain screw to prevent leaks during reassembly.

4. Refit the Drain Screw

  • Once drainage is complete, reinstall the drain screw using a new gasket if necessary.
  • Torque the screw to 8 Nm to prevent overtightening, which can damage the radiator or thread.

5. Fill with New Coolant

  • Insert a funnel into the radiator fill neck.
  • Slowly pour the new coolant into the radiator until the level reaches the filler neck. The system holds approximately 1.1 liters .

6. Bleed the Cooling System

  • With the radiator cap off, briefly tilt the bike from side to side or gently squeeze the radiator hoses to release any trapped air.
  • If equipped, slightly loosen the radiator bleed screw until coolant free of air bubbles emerges, then tighten it to 8 Nm .
  • Add coolant as needed to top up after bleeding.

7. Refit the Radiator Cap and Check for Leaks

Securely install the radiator cap. Start the engine and let it idle for several minutes with periodic revving, then switch it off and allow it to cool. Check coolant level and top up if necessary.

Special Notes for the Sherco 125SE-R

  • The 2023 125SE-R's aluminum cooling system is efficient but sensitive to air pockets. Bleed thoroughly to avoid hot spots or overheating.
  • Always use a recommended coolant blend. Motul Motocool Factory Line -35°C is factory-approved for corrosion resistance and freeze protection .
  • Inspect hoses and radiator seals for aging or wear while you have access. Preventative replacement now can avoid future issues.

Disposal

Dispose of used coolant responsibly. Do not pour it down drains. Most auto parts stores or waste management facilities accept coolant for recycling.

Pro Tip

Changing coolant at the manufacturer-recommended interval keeps your Sherco's engine at optimal race temperature and prevents scale or rust. This small maintenance step ensures long service life for your championship-caliber engine.

Related Shopping Categories

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Shop Coolant for a 2023 Sherco 125SE-R Dirt Bike.

Shop Temperature Sensors for a 2023 Sherco 125SE-R Dirt Bike.

Shop Tools for a 2023 Sherco 125SE-R Dirt Bike.

Shop Radiator Hoses for a 2023 Sherco 125SE-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.