How to Change the Coolant on a 2020 Husqvarna FC450HQ

Shop parts for a 2020 Husqvarna FC450HQ Dirt Bike.

Regularly changing the coolant in your 2020 Husqvarna FC450HQ is crucial for maintaining optimal engine performance and longevityespecially given the bike's high compression and power output. Below you will find a MotoSport-exclusive step-by-step guide tailored to your FC450HQ.

What You Need

  • New coolant (manufacturer-recommended or approved for aluminum radiators)
  • Distilled water (if your coolant requires mixing)
  • Drain pan
  • Socket set – typically 8mm or 10mm for radiator bolts
  • Replacement sealing washer (recommended)
  • Rags and gloves

Important Note About the 2020 FC450HQ

Your FC450HQ uses a lightweight aluminum radiator and a high-performance liquid cooling system to manage the engine's considerable heat output. Using the correct coolant protects not only against freezing and overheating but also prevents corrosion unique to aluminum and magnesium components. Never use plain water or standard automotive coolant not specified for motocross bikes.

Step-by-Step Coolant Change Procedure

  1. Let the engine cool completely. Never attempt to service the cooling system while the engine is warm.
  2. Stabilize the bike upright. Use a stand or keep it balanced so both wheels are level. This helps with complete draining and refilling.
    (2021 & 2022 model procedures confirm the importance of upright position).
  3. Remove the radiator cap. Carefully twist off the cap to release any built-up pressure.
  4. Locate and remove the coolant drain bolt. On the FC450HQ, this is typically found at the lowest point of the water pump housing on the right side of the engine. Put your drain pan underneath, then unscrew the drain bolt (and sealing washer). Allow all coolant to fully drain.
  5. Optionally, flush with distilled water for a thorough clean, especially after heavy or sandy riding. Re-install the drain bolt before refilling. Replace the sealing washer if needed to ensure a tight seal.
  6. Refill with new coolant. Pour in through the radiator neck until fluid reaches the top of the radiator fins.
    • If using concentrated coolant, mix it 50/50 with distilled water before pouring.
    • Avoid tap water to prevent mineral build-up which can harm the internals.
  7. Burp the system. With the radiator cap off, start the engine and let it idle for a few minutes. Gently rock the bike side-to-side and blip the throttle. This helps any trapped air escape.
  8. Check and top off the coolant level. Shut off the engine, carefully top off as needed, and reinstall the radiator cap.
  9. Inspect for leaks. Confirm the drain bolt and hoses are tight, and check for any drips under the bike.
  10. Dispose of old coolant responsibly. Used coolant is hazardoustake it to your local recycling center or automotive dealer.

Additional Ownership Tips

  • Check your coolant level before every ride, especially after a hard day at the track or in hot weather.
  • If you ride in extreme temperatures, consider a high-performance or motocross-specific coolant formulated for aluminum systems.
  • The FC450HQ's radiator and cooling system are compactany coolant loss can quickly lead to overheating. Watch for white steam or unusually high engine temperatures and service immediately if detected.
  • Inspect radiator shrouds and hoses for cracks or wear, replacing with OEM or high-quality aftermarket parts as necessary to preserve system integrity.

Related Shopping Categories

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Shop Radiator Hoses for a 2020 Husqvarna FC450HQ 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.