How to Change the Coolant in a 2017 Husqvarna FX450

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Keeping the cooling system of your 2017 Husqvarna FX450 in top shape is crucial for performance and engine longevity. Regular coolant changes will help prevent overheating, corrosion, and system failures–especially in a high-performance dirt bike like the FX450, which is based on robust KTM lineage but fine-tuned for competition and hard off-road use. Below is a proprietary MotoSport guide specifically for your FX450.

What You Need

  • Fresh, high-quality motorcycle coolant (avoid using straight water or automotive antifreeze)
  • Socket wrench set (typically a 5 mm or 6 mm Allen key for the drain bolt)
  • Drain pan or bucket
  • Funnel
  • Safety gloves and rags

Step-by-Step Coolant Change Procedure

  1. Let the Bike Cool Down
    Make sure the FX450 is completely cool before removing the radiator cap to avoid burns from pressurized hot coolant. Never open the system while the bike is hot.
  2. Remove the Skid Plate (If Equipped)
    For best access to the water pump and drain bolt, take off the skid plate if your FX450 has one.
  3. Elevate and Level Your Dirt Bike
    Place the bike on a stand so it's upright and level. This helps all coolant drain completely from both radiators and the engine block.
  4. Loosen the Radiator Cap
    Slightly loosen (but do not remove) the radiator cap to release any pressure. Now fully remove it to allow coolant to flow freely.
  5. Locate and Remove the Water Pump Drain Bolt
    Identify the coolant drain bolt–on the FX450 this is on the side of the water pump, typically on the right side of the bike. Place your drain pan underneath and remove the bolt. Allow all coolant to drain out.
  6. Flush with Distilled Water (Optional but Recommended)
    If the old coolant looked especially dirty or contaminated, reinstall the drain bolt, fill the radiators with distilled water, start the bike, run it for a minute, shut it down, and drain again. This helps clear any residue from the system.
  7. Reinstall the Drain Bolt
    Ensure the sealing washer is clean and intact to prevent leaks. Torque the drain bolt to manufacturer spec (usually 6-8 Nm for Husqvarna dirt bikes).
  8. Fill with New Coolant
    Using a funnel, slowly pour the new coolant into the radiator neck until full. Gently rock the bike from side to side to help trapped air escape. Continue topping up as needed.
  9. Bleed the Cooling System
    Start the engine with the radiator cap off and let it idle for a few minutes, watching for air bubbles. Top up coolant if the level drops as air purges.
  10. Reinstall Radiator Cap
    When the coolant level stabilizes and there are no more bubbles, securely fit the cap.
  11. Inspect for Leaks and Test Ride
    Check all connections and drain bolt for leaks. Replace the skid plate if removed. Take the bike for a moderate ride, let it cool down, and check the coolant level again. Top up as needed.

Special Notes for the FX450 Owner

  • The 2017 FX450 shares much of its cooling layout with KTM's four-stroke range. Fast, high-revving operation and competitive riding increase heat–changing coolant more often than street bikes is a smart move.
  • Use motorcycle-specific coolant compatible with magnesium alloy engine cases–avoid automotive coolants with silicates or phosphates, which can damage internal components.
  • The FX450's radiators are narrow and can develop air pockets easily. Take extra care during bleeding to ensure there are no trapped air bubbles, which can cause overheating.
  • If riding in harsh conditions or performing frequent deep water crossings, inspect the system and change coolant more often to prevent corrosion.

Routine coolant changes are essential to keeping your 2017 Husqvarna FX450 running cool and strong on the trail or track. For all your maintenance parts and upgrades, MotoSport has you covered with premium-quality supplies made for your ride.

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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.