How to Change the Coolant in a 2014 Yamaha WR450F

Shop parts for a 2014 Yamaha WR450F Dirt Bike.

Proper coolant maintenance is key to keeping your 2014 Yamaha WR450F running cool on the toughest trails. Doing the job yourself is straightforward – just follow these MotoSport-specific steps for a full drain, flush, and refill. Below you–ll also find tips unique to your bike that every owner should know.

Tools & Supplies Needed

  • New coolant (aluminum-compatible is ideal)
  • Bucket or drain pan
  • Socket set (8mm for most bolts)
  • Phillips screwdriver (for shroud removal)
  • Compressed air (if doing a system flush)
  • Rags or shop towels
  • Distilled water (for flushing if switching coolant type)

Step-by-Step Instructions

1. Let the Bike Cool

Before starting, ensure the engine is completely cool to avoid burns from hot coolant under pressure.

2. Remove Both Radiator Shrouds

Using a Phillips screwdriver, unbolt and lift off the plastic radiator shrouds. This gives you easy access to the radiator cap and hoses.

3. Remove the Radiator Cap

Twist the radiator cap counterclockwise and set it aside. This helps the coolant drain freely.

4. Locate and Remove the Coolant Drain Bolt

The 2014 WR450F– drain bolt is on the right side of the engine, typically below the water pump. Place your drain pan underneath, then use an 8mm socket to remove the bolt. Watch for the copper washer that seals the bolt – don–t lose it.

5. Drain the Old Coolant

Allow the coolant to fully drain into the pan. Slightly tilting the bike side-to-side can help remove trapped fluid.

6. Flush the System (Recommended When Changing Coolant Type)

If changing to a different coolant formulation, flush with distilled water. Reinstall the drain bolt, fill the radiator with distilled water, run the engine for a minute, and repeat the drain. Compressed air can also be blown through the radiators with hoses removed for a complete flush.

7. Reinstall the Drain Bolt

Once drained, ensure the copper washer is in place and reinstall the drain bolt. Tighten firmly, but remember – these threads are in aluminum, so don–t overtighten.

8. Fill with New Coolant

Add new coolant slowly into the radiator until full. For the WR450F, use an aluminum-safe, motorcycle-specific coolant for best protection.

9. Bleed Air Bubbles

Lean the bike side-to-side, gently tap the radiator hoses to work out air bubbles. Continue adding coolant until the level stabilizes.

10. Reinstall the Radiator Cap and Shrouds

Secure the radiator cap, then bolt the shrouds back in place.

11. Warm Up & Recheck

Start the engine and let it idle with the radiator cap on. After it cools, check coolant level and top off if needed. Inspect for leaks around the drain bolt and hoses.

WR450F 2014 Model Notes

  • Check Cooling System Integrity– The 2014 WR450F uses a high-capacity radiator. Inspect hoses and connections for wear or bulging before refilling–replace if needed.
  • Use Only Aluminum-Compatible Coolant– This generation of WR450F features aluminum radiators and engine parts. Avoid silicate-based automotive coolants to prevent internal corrosion.
  • Flush Interval– Yamaha recommends replacing coolant every 2 years or 24 months, but frequent off-road use may require more frequent changes.
  • Proper Bleeding– Trapped air can lead to overheating. Always lean and tap the bike to allow bubbles to escape, especially after a full system drain.

Maintaining your 2014 Yamaha WR450F–s cooling system keeps you out on the trails and away from the shop. Follow this MotoSport guide for best results and use only quality parts and fluids to match the performance of your dirt bike.

Related Shopping Categories

Shop Radiators for a 2014 Yamaha WR450F Dirt Bike.

Shop Coolant for a 2014 Yamaha WR450F Dirt Bike.

Shop Temperature Sensors for a 2014 Yamaha WR450F Dirt Bike.

Shop Tools for a 2014 Yamaha WR450F Dirt Bike.

Shop Radiator Hoses for a 2014 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.