How to Change the Coolant in a 2019 Husqvarna FX450

Shop parts for a 2019 Husqvarna FX450 Dirt Bike.

Maintaining the correct coolant level and using fresh coolant is crucial to the longevity and performance of your 2019 Husqvarna FX450. This guide delivers MotoSport's step-by-step, proprietary process for changing the coolant in your FX450, designed especially for owners who want to keep their machines running at peak temperatures with confidence.

What You'll Need

  • New coolant (race-approved, motorcycle-specific; check your manual for type/mixture recommendations)
  • Basic hand tools (socket set, ratchet, screwdrivers)
  • Drain pan
  • Funnel
  • Clean water (for flushing, if desired)
  • Rags or shop towels
  • Protective gloves and eyewear

Step 1: Prepare Your FX450

  • Ensure your motorcycle is completely cool before you begin. Never remove the radiator cap when the system is hot pressurized steam and hot fluid can cause severe burns.
  • Stand the bike upright on a level surface or sturdy stand.

Step 2: Access the Radiator Cap

  • Remove the seat and right side panel as needed to access the radiator cap.
  • On the FX450, press the release button on top of the cap, turn the cap counterclockwise, then lift it off.

Step 3: Drain the Old Coolant

  • Place the drain pan under the coolant drain bolt, located at the lower right side of the engine (typically on the water pump cover).
  • Remove the drain bolt and allow coolant to fully drain.
  • Open the radiator cap for better flow.
  • If desired, cycle a small amount of clean water through the system to flush out any debris, and then let this drain completely. Do not leave water in the system at any time, especially in sub-freezing climates.

Step 4: Reinstall the Drain Bolt

  • Inspect and, if necessary, replace the sealing washer on the drain bolt.
  • Reinstall the drain bolt and torque to manufacturer specification (refer to your owner's manual).

Step 5: Fill with New Coolant

  • Using a funnel, slowly fill the system with fresh coolant up to the lower edge of the radiator filler neck, allowing air bubbles to escape.
  • Gently rock the motorcycle side-to-side to help purge trapped air.
  • Reinstall the radiator cap by turning it clockwise until the release button clicks into place.

Step 6: Check and Bleed the System

  • Start the engine and let it idle for several minutes, watching for any leaks around the drain bolt and coolant hoses.
  • Shut off the engine, let it cool, and recheck coolant level. Top off if needed.

Additional Notes for 2019 Husqvarna FX450 Owners

  • The FX450 is closely related to the KTM SX-F and Husqvarna FC450; however, coolant system parts such as hoses, cap, and water pump are FX-specific and should always be matched to your model year for fit and pressure rating reliability.
  • The FX450 features a unique cold start button at the bottom of the throttle valve body-ensure this button is not accidentally engaged during or after service, as it affects starting and cold idle characteristics.
  • Inspect your radiator breather hoses for kinks upon reassembly to prevent overheating issues or overpressure situations.

Safety & Environmental Reminders

  • Avoid skin and eye contact with coolant. If coolant gets into your eyes, immediately rinse thoroughly with water and seek medical attention.
  • Dispose of old coolant in accordance with local regulations. Never pour it down the drain or onto the ground.

Routine coolant changes are a key part of FX450 ownership, keeping your engine protected from extremes and race track demands. For more model-specific parts, always trust MotoSport to keep your ride ready for wherever you take it.

Related Shopping Categories

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Shop Temperature Sensors for a 2019 Husqvarna FX450 Dirt Bike.

Shop Tools for a 2019 Husqvarna FX450 Dirt Bike.

Shop Radiator Hoses for a 2019 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.