How to change the coolant in a 2020 Husqvarna FX450 Dirt Bike

How to Change the Coolant in a 2020 Husqvarna FX450: Step-by-Step Guide

Shop parts for a 2020 Husqvarna FX450 Dirt Bike.

Routine coolant changes are vital for your 2020 Husqvarna FX450, helping to maintain proper engine temperature and prevent internal corrosion. The FX450’s advanced design offers remarkable off-road performance, but its high-performance liquid-cooled engine depends on fresh coolant to keep running strong in any condition. Follow this exclusive MotoSport step-by-step guide to safely change your coolant and keep your FX450 ready for action.

What You Need

• Fresh coolant (specific for dirt bikes or recommended by Husqvarna)
• Drain pan or bucket
• Basic hand tools (socket set, pliers)
• Shop rags
• Protective gloves & glasses

Steps to Change the Coolant

• Preparation
  • Ensure the bike is completely cool–never open the cooling system when hot, as pressurized steam and fluid can cause injury.
  • Place your FX450 on a stable, level stand so it sits evenly, ensuring total coolant drainage and easier access to components.
• Remove Bodywork for Access
  • If needed, remove the right side cover or shrouds to easily reach the radiator and filler cap.
• Remove Radiator Cap
  • Find the radiator cap at the top of the right radiator.
  • Press the release button, turn the cap counterclockwise, and lift it free. This relieves system pressure and allows draining.
• Drain Old Coolant
  • Position your drain pan under the appropriate engine drain bolt (typically near the water pump at the lowest point).
  • Remove the drain bolt and let the old coolant completely drain out. For better results, gently rock the bike side-to-side to encourage maximum drainage.
  • Dispose of old coolant properly; never pour it down drains or onto the ground.
• Flush the System (Optional but Recommended)
  • For heavily used or neglected bikes, use distilled water to flush the cooling system. Fill, run the engine briefly (with cap on), then let cool and drain again to remove contaminants. Repeat as necessary for clear outflow.
• Install Drain Bolt
  • Reinstall and properly torque the drain bolt. Replace the sealing washer if needed to prevent leaks.
• Add New Coolant
  • Pour new coolant slowly into the radiator until full. Squeeze the radiator hoses gently to burp out trapped air.
  • Check for leaks at the drain bolt and hose connections before proceeding.
  • Reinstall the radiator cap: place it on, turn clockwise, and ensure the release button locks into place.
• Check Coolant Level and Bleed Air
  • Start the engine and let it idle briefly with the cap on. Watch the system for leaks and listen for odd noises. Turn off after a brief warm-up.
  • Once cool, recheck the coolant level and top off if necessary. Be sure the radiator and overflow are properly filled and no air bubbles remain.
• Complete Reassembly
  • Securely reinstall any removed bodywork.
  • Wipe down spilled coolant and ensure all tools are cleared from the area before riding.

Special Notes for the 2020 FX450

• The FX450 uses a high-performance, closed-course competition engine. Keeping the coolant fresh protects the cylinder head and water pump in extreme riding conditions.
• Verify the function of the cold start button, located at the bottom of the throttle body, during reassembly. This feature helps cold-start performance by adjusting air/fuel mix automatically for your fuel-injected FX450.
• Always inspect radiator hoses for cracks or swelling during coolant changes, replacing as needed for optimal reliability.

Safety & Environmental Cautions

• If coolant contacts skin or eyes, rinse thoroughly with water and seek medical attention if necessary. Change any clothing that has come in contact with coolant promptly.
• Dispose of used coolant at an approved recycling center; antifreeze is toxic to people, animals, and the environment.

Regular coolant changes guarantee smoother, safer rides and preserve your 2020 Husqvarna FX450’s legendary performance—keep your machine in top shape and enjoy every MotoSport adventure.

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Shop Radiator Hoses for a 2020 Husqvarna FX450 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.