How to Change the Coolant in a 2020 Yamaha WR450F
Shop parts for a 2020 Yamaha WR450F Dirt Bike.
The 2020 Yamaha WR450F is a performance-focused enduro machine designed for durability & consistent power output. Keeping your cooling system in peak condition is critical to prevent overheating on the trail and to maintain engine reliability. Follow this proprietary MotoSport.com guide for a seamless coolant change, ensuring your machine remains trail-ready.
What Makes the 2020 WR450F Unique?
The 2020 WR450F utilizes an aluminum engine and a wraparound radiator designed for aggressive off-road use. This WR edition features a closed-loop cooling system that keeps engine temperatures stable during protracted rides in harsh environments. Yamaha recommends a coolant replacement every 2 years or whenever your maintenance schedule dictates. Always use high-quality coolant safe for aluminum components to prevent electrolysis and corrosion.
What You Will Need
- Fresh coolant (recommended for aluminum engines)
- 8mm socket or wrench
- Drain pan/container
- Distilled water (for flushing, if desired)
- Rags or paper towels
- Safety gloves & eyewear
- Skid plate removal tool (if equipped)
Step-by-Step Coolant Change Procedure
- Allow your engine to cool completely. Removing the radiator cap or drain bolt while hot can lead to burns and pressure-related sprays.
- Remove the skid plate (if installed). Locate the mounting bolts beneath your bike and set the plate aside for access to the water pump.
- Locate the water pump drain bolt. On the WR450F, this is typically an 8mm bolt found at the bottom of the water pump cover (right side of the engine).
- Position a drain pan beneath the drain bolt.
- Remove the radiator cap slowly to release system pressure.
- Remove the drain bolt and allow all coolant to flow into the pan. Tip the bike gently side to side to aid draining.
- Flush the system (optional but advised). Pour distilled water into the radiator, reinstall drain bolt, and run the bike briefly to circulate (do not overheat). Drain completely again. Repeat until flush runs clear.
- Reinstall the drain bolt securely.
- Add new coolant slowly to the radiator until just below the base of the filler neck.
- Start the engine and let it idle. As the coolant circulates, trapped air will escape. Top off the radiator as the level drops.
- Check for leaks around the drain bolt and hoses. Install the radiator cap.
- Re-attach the skid plate and clean up any spills.
Key 2020 WR450F Owner Notes
- Use only coolants safe for aluminum engines to avoid internal corrosion and galvanic reactions.
- Never use tap water when flushing—it may introduce mineral deposits causing hot spots or blockages.
- Coolant change intervals are every 2 years or more frequently for heavy use models.
- Always dispose of old coolant responsibly—antifreeze is toxic to people and the environment.
With regular coolant servicing, your Yamaha WR450F will run cooler, last longer, and keep delivering championship performance on any terrain.
Related Shopping Categories
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Shop Radiator Hoses for a 2020 Yamaha WR450F 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.