How to Change the Coolant in a 2024 Husqvarna FX350

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Keeping your 2024 Husqvarna FX350 at optimal performance means regular maintenance–and coolant changes are a vital part of this routine. Whether you push your FX350 to the racing limit or log trail hours every weekend, a thorough coolant flush protects your high-revving engine from overheating, corrosion, and premature wear. Here is MotoSport’s proprietary step-by-step guide on how to change the coolant for your FX350, with key notes just for this model to help you avoid common pitfalls and keep your machine running cool.

Essential Tools & Supplies

  • Fresh coolant (ensure it’s compatible with modern aluminum engines and race applications)
  • Drain pan
  • Socket set
  • Funnel
  • Shop rags
  • Distilled water (for flushing and mixing if required)
  • Protective gloves

Drain the Old Coolant

  • Ensure the bike is cool and resting securely upright (use a stand for stability).
  • Remove the seat and upper shrouds as needed for clear access to the radiator cap and the right side of the engine.
  • Locate and slowly open the radiator cap to release any system pressure.
  • Place the drain pan underneath the water pump (left-hand side, lower engine case).
  • Remove the coolant drain bolt and washer from the bottom of the water pump. Allow all old coolant to fully drain from the system.

Flush the Cooling System

  • To eliminate residual contaminants, reinstall the drain bolt loosely and fill the radiator with distilled water. Run the engine briefly–just enough to circulate the water.
  • Turn off the bike and drain out the flush. Repeat if the expelled water still appears dirty.
  • Reinstall the drain bolt, tightening to spec (do not overtighten to avoid stripping the case).

Refill with Fresh Coolant

  • Pour the new coolant into the radiator neck using a funnel, filling until the level reaches the bottom of the neck.
  • Double-check that the expansion tank (if present on your model) is filled to the proper mark.

Bleed the Cooling System

  • Start the FX350 with the radiator cap off and allow it to idle. As air works out of the system, the coolant level may drop. Carefully top up as needed.
  • Lightly blip the throttle several times to help purge trapped air.
  • Once the cooling fan cycles on (if equipped) and coolant holds steady at the neck, shut off the bike and top up a final time.
  • Secure the radiator cap and reassemble any removed parts.

Important FX350-Specific Tips & Warnings

  • Always monitor coolant level after riding–some FX350s are sensitive to coolant loss, especially after aggressive riding or racing. An overflowing coolant reservoir or steam under hard use can indicate a cap issue, air pockets, or overfilling
  • Check the radiator and cap for dirt or mud buildup. The FX350’s narrow radiator design can clog easily, reducing heat dissipation.
  • When switching to high-performance or race-grade coolants, verify compatibility with your model’s aluminum and magnesium engine components.
  • If you notice frequent overheating, investigate for potential air leaks, bad radiator cap, or possible blockage in the hose system. A reservoir mod or overflow bottle can be a worthwhile preventative upgrade for extreme use cases.

Final Steps

  • After the initial coolant change, keep a close watch on the coolant level for several rides as trapped air may still purge from the system.
  • Dispose of old coolant responsibly–it is toxic to both pets and the environment.

With routine coolant changes and attentive care, your 2024 Husqvarna FX350 will keep its edge wherever you ride. For all the right parts, fluids, and performance upgrades, trust MotoSport to keep you covered.

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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.