How to Change the Coolant in a 2018 Yamaha WR250F
Shop parts for a 2018 Yamaha WR250F Dirt Bike.
Keeping your 2018 Yamaha WR250F running cool under pressure means performing routine cooling system maintenancechanging the coolant is one of the most essential tasks for longevity and optimal performance. Here–s a robust, model-specific guide focused on your WR250F, so you can tackle this procedure confidently and safely.
Why Change Your Coolant?
Over time, coolant degrades and becomes less effective at transferring heat and protecting against corrosion. Yamaha recommends changing the coolant every one to two years or every 60 hours of engine operation, depending on use. Staying ahead of this interval prevents costly overheating and corrosion issues.
What You–ll Need
- Compatible coolant (Yamaha recommends a high-quality ethylene glycol-based coolant for aluminum engines)
- Distilled water (if flushing the system)
- Drain pan
- Ratchet with 8mm socket
- Phillips screwdriver
- Funnel
- Replacement copper washer for the drain bolt
- Clean rags
- Protective gloves
Preparation
- Allow the engine to cool completely. Never open the radiator cap or cooling system while hotserious injury from scalding fluid or steam can occur.
- Place your WR250F securely on a stand to keep it upright and stable.
Step-by-Step Coolant Change Process
- Remove bodywork: Take off the seat and both side air scoops to access the radiator and reservoir.
Tip: This is unique to WR modelsmuch of the bodywork must be removed for proper access. - Remove the radiator cap: Place a rag over the cap and slowly turn counterclockwise to release residual pressure.
- Drain the radiator and engine:
- Locate the coolant drain bolt on the lower water pump cover (right side of the engine).
- Position the drain pan beneath and remove the drain bolt along with its copper washer.
- Allow the coolant to fully drain from the engine and the radiator.
- Drain the reservoir tank:
- Detach the reservoir hose, then carefully remove the coolant reservoir tank itself if necessary for thorough draining.
- Dump out any old coolant from the tank.
- Flush the system (optional but recommended):
- Refit the drain bolt loosely.
- Fill the system with distilled water, start the bike, and let it run briefly.
- Allow the engine to cool, then drain again to remove contaminants.
- Reassemble:
- Install a new copper washer on the coolant drain bolt and torque to 10 Nm (7.2 ft-lb).
- Reinstall the reservoir tank and reconnect all hoses securely.
- Refill with fresh coolant:
- Pour coolant into the radiator until full and fill the reservoir to the "Full" mark. Avoid overfilling.
- Tilt the bike back and forth to release any trapped air, topping off as needed.
- Bleed the system:
- Start the engine and let it idle with the radiator cap off. Squeeze radiator hoses gently to help air escape.
- Watch for rising coolantwhen air bubbles stop, shut off the bike and top up the radiator.
- Refit the radiator cap securely and ensure no leaks are present.
- Reinstall bodywork and seat.
- Check levels after a short ride: When fully cooled down, inspect the coolant level in both the radiator and reservoirtop up as required.
WR250F Model-Specific Notes
- Aluminum Radiators: Use only aluminum-compatible coolant (silicate-free) to prevent corrosion.
- Reservoir Access: The coolant reservoir is compact and somewhat tucked in, requiring the removal of certain body panels for accesspatience helps.
- Torque Settings: Do not overtighten the drain bolt; use a torque wrench as specified to prevent thread damage to the engine casing.
- Check for Leaks: WR250F water pumps are robust, but always inspect for leaks at the drain bolt and hoses after reassembly.
Disposal & Environmental Considerations
Dispose of old coolant at a certified recycling or hazardous waste facilitycoolant is toxic and should never be poured down the drain or into the environment.
Maintenance Tip
Coolant level dropping over time could indicate a leak, hose issue, or head gasket problem. Regular inspection keeps your WR250F running strong and safe for every ride.
Related Shopping Categories
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Shop Tools for a 2018 Yamaha WR250F Dirt Bike.
Shop Radiator Hoses for a 2018 Yamaha WR250F 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.