How to Change the Coolant in a 2020 Yamaha WR250R (Dual Sport)

Shop parts for a 2020 Yamaha WR250R Dirt Bike.

Maintaining the cooling system of your 2020 Yamaha WR250R is vital to performance, longevity, and reliability—especially given its high-revving, liquid-cooled engine and dual sport versatility. A proper coolant change not only prevents overheating but ensures your engine is protected in extreme conditions. The WR250R is engineered with a separate reservoir tank and water pump design that makes coolant changes slightly different from some traditional dirt bikes, so owners should pay special attention to the following procedure.

What You–ll Need

  • Yamaha-approved coolant or high-quality motorcycle coolant
  • Distilled water (if diluting concentrate)
  • 8 mm socket
  • Phillips screwdriver
  • Allen wrenches
  • Torque wrench
  • Funnel
  • Drain pan
  • Thick rag or towel

Step 1: Preparation & Safety

  • Ensure the engine is completely cool before beginning the procedure. The cooling system is pressurized, and hot coolant can cause severe injury.
  • Place the bike upright on a stand in a well-ventilated workspace.

Step 2: Remove Panels & Seat

  • Use your Philips screwdriver and Allen wrenches to remove the side panels and the seat for easy access to the radiator and reservoir tank.

Step 3: Drain the Reservoir Tank

  • Disconnect the vent hose from the coolant reservoir tank.
  • Carefully remove the reservoir tank and pour out any remaining coolant into your drain pan. Note: On the WR250R, the reservoir can be more challenging to remove, so be patient and ensure the vent tube is fully disconnected to make this step easier.

Step 4: Remove the Radiator Cap

  • With the engine cool, place a thick rag over the radiator cap. Slowly turn the cap counterclockwise to the first stop to let any residual pressure escape, then remove the cap entirely once there's no hissing sound.

Step 5: Drain the Cooling System

  • Locate the coolant drain bolt on the water pump (lower right side of the engine). Remove it using an 8 mm socket. Be sure to remove the copper washer as well. Allow all coolant to drain thoroughly from the engine and radiator into the pan.

Step 6: Replace the Drain Bolt & Washer

  • Install a new copper washer on the drain bolt for a leak-free seal and torque the bolt to 10 Nm (7.2 ft-lb).

Step 7: Replace the Reservoir Tank

  • Reinstall the reservoir tank and attach the vent hose securely.

Step 8: Add Fresh Coolant

  • Using a funnel, fill the radiator with Yamaha-approved coolant or a 50/50 mix of coolant and distilled water if mixing from concentrate.
  • Fill the reservoir tank to the "Full" mark.

Step 9: Bleed the System & Re-Check

  • Leave off the radiator cap and start the engine. Let it idle for a few minutes to circulate coolant and remove air pockets. Top off the radiator as needed.
  • Once bubbles stop appearing, shut off the engine and install the radiator cap securely. Recheck the reservoir and fill to the correct level, if needed.

Step 10: Reinstall Bodywork

  • Reinstall the seat and side panels.

Important Notes for WR250R Owners

  • The WR250R uses a small, high-efficiency radiator. Keep the radiator fins clean and free of debris for best cooling.
  • Always replace the copper washer on the drain bolt to avoid leaks.
  • Stick with OEM- or high-quality coolants designed for aluminum radiators.
  • Check coolant levels and condition every 12-24 months, or after heavy use in harsh environments.
  • Improper coolant levels can cause overheating and serious engine damage.

Changing your WR250R–s coolant is straightforward with the right tools and attention to detail. Prevent overheating rides and keep your dual sport running strong by following this trusted MotoSport coolant maintenance guide.

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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.