How to Change the Coolant in a 2020 Yamaha WR250F
Shop parts for a 2020 Yamaha WR250F Dirt Bike.
Regular coolant changes keep your 2020 Yamaha WR250F’s engine running cool – essential for off-road reliability and long engine life. The WR250F features a high-performance liquid-cooled engine with an aluminum radiator, and using the right technique is crucial for maintenance.
Preparation
- Tools & Supplies: Proper coolant (recommend Yamaha-approved or any aluminum engine safe coolant), distilled water, a drain pan, 8mm socket, Phillips screwdriver, funnel, rag or towel, and torque wrench.
- Make sure the engine is completely cool before beginning—a hot system can release pressurized, scalding coolant.
- Work on level ground and ensure the bike is secure on a stand.
Step-by-Step Coolant Change
- Remove bodywork for access: Take off the seat and left air scoop to reach the radiator and reservoir.
- Release system pressure: Place a thick rag over the radiator cap. Turn the cap counterclockwise to the detent to release any pressure, then press down and fully remove it.
- Drain coolant:
- Locate the coolant drain bolt on the water pump (usually on the right side).
- Position the drain pan under the water pump. Remove the drain bolt along with its copper washer. Let the coolant fully drain from the radiator and engine.
- Remove & drain reservoir:
- Disconnect the reservoir tank vent hose to access the tank. Remove the coolant reservoir and drain any remaining fluid.
- Flush the system (recommended):
- Reinstall the drain bolt temporarily, fill the radiator with distilled water, run the engine for a few minutes, let it cool, then drain.
- Reinstall drain bolt:
- Use a new copper washer if available. Torque the drain bolt to 10 Nm (7.2 ft–lb).
- Refill coolant:
- Fill the radiator slowly with the correct coolant mix. Stop when fluid reaches the base of the radiator neck.
- Fill the coolant reservoir to the "full" line.
- Bleed air from system:
- With the radiator cap off, start the bike and let it run briefly—add coolant as bubbles escape. When the level remains steady and no more bubbles appear, stop the engine and reinstall the cap.
- Reassemble:
- Install the radiator cap, seat, and body panels.
- Check for leaks:
- Run the engine and inspect connections. After a short ride, recheck the coolant level and top off if needed.
Important Notes for 2020 WR250F Owners
- Always use coolant formulated for aluminum engines to prevent corrosion and provide freeze/boil protection.
- The coolant change interval is every 2 years or 24,000 miles, but more frequent changes can benefit severe riders.
- The WR250F's radiator is tightly packaged for competition, so take extra care not to damage fins or overfill the system.
- Coolant reservoir removal can be fiddly on this model due to the frame cradle and vent hose—work patiently and use needle-nose pliers as needed.
- Dispose of old coolant responsibly. Used coolant is toxic and should always be handled and recycled according to local regulations.
With these steps, your 2020 WR250F will be ready to tackle tough trails and technical terrain, running cool when it counts.
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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.