How to Change the Coolant in a 2018 Husqvarna FS 450

Shop parts for a 2018 Husqvarna FS 450 Dirt Bike.

Proper cooling is essential for the high-performance 2018 Husqvarna FS 450. Regular coolant changes ensure optimal engine temperature, prevent overheating, and preserve the longevity of internal components. Follow this MotoSport-exclusive guide for a safe, thorough coolant change tailored to your FS 450.

What You Need

  • Fresh coolant (recommended for high-performance four-strokes, check your manual for correct type)
  • Allen/key set
  • Drain pan
  • Funnel
  • Gloves and eye protection
  • Rags for cleanup

Safety First

  • Always allow the engine to cool fully before removing the radiator cap or draining coolant. Pressurized hot coolant can cause severe burns.
  • If coolant comes into contact with your skin or eyes, rinse immediately with water and consult a doctor if necessary.

Step-by-Step Coolant Change for Husqvarna FS 450

  1. Position the Bike: Mount the FS 450 securely on a stand so it sits level. This ensures a complete drain and refill.
  2. Remove the Right Side Panel: Access the radiator cap by removing the right side cover. Use appropriate tools as required for your plastics.
    Note: The 2018 FS 450 design allows direct access to the radiator; no need to remove the tank for routine coolant service.
  3. Open the Radiator Cap: Carefully twist and remove the radiator cap to release any internal pressure.
  4. Locate the Water Pump Drain Bolt: Find the coolant drain bolt at the lowest point of the water pump housing (on the right side of the engine). Place a drain pan beneath this point.
  5. Drain the Coolant: Remove the drain bolt and allow coolant to flow into your pan. Tilting the bike side-to-side ensures full drainage.
    Replace the bolt securely once fully drained.
  6. Flush (Optional but Recommended): For a more thorough job, flush with distilled water:
    • Reinstall drain bolt, fill system with distilled water, replace radiator cap, and run the engine for a few minutes.
    • Cool, then drain as above to remove debris and old fluid.
  7. Refill with Fresh Coolant: Place a funnel in the radiator neck. Pour in the new coolant until it reaches just below the cap seat. Bleed any trapped air by gently rocking the bike or briefly running the engine with the cap off, adding coolant if needed.
  8. Reinstall the Radiator Cap: Securely fit the radiator cap once filled.
  9. Check for Leaks: Start the bike and let it reach operating temperature. Shut off and inspect all joints and connections for leaks. Double-check coolant level after the initial ride and top off if required.

FS 450 Owner's Tips – What Makes This Model Special

  • Factory Closed-System Cooling: The FS 450 features a high-capacity closed-system radiator designed for the heat of supermoto use. Use only premium coolant designed for modern off-road engines.
  • Capacity: The approximate coolant capacity is 1.8 liters – overfilling can affect pressure balance, so fill just below the maximum level mark.
  • Gasket Reuse: Inspect the drain bolt washer each time. Replace if damaged or compressed to avoid leaks.
  • Environmental Responsibility: Always dispose of old coolant at an authorized recycling center – never pour into drains or onto the ground.

Regular service & modern coolant will keep your FS 450 running cool & ready for the track. For all maintenance items, performance parts, and replacement plastics, MotoSport offers a full range of components designed for your exact 2018 Husqvarna FS 450.

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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.