How to Change the Coolant in a 2020 Husqvarna FE501HQ

Shop parts for a 2020 Husqvarna FE501HQ Dirt Bike.

Regular coolant changes are essential for optimal performance and protecting the high-output engine of your 2020 Husqvarna FE501HQ. This model’s advanced powerplant and closed-loop cooling system require precise care to ensure reliability, especially for demanding off-road and dual-sport riding environments. Here’s a step-by-step guide designed for FE501HQ owners who want reliable, proprietary maintenance guidance from MotoSport.

Tools – Supplies You Need

  • Socket wrench and appropriate sockets
  • Soft rags
  • Drain pan
  • High-quality motorcycle coolant, ideally pre-mixed and non-silicate (refer to manufacturer recommendations)
  • Optional: Distilled water for flushing
  • Torque wrench
  • Replacement crush washer or O-ring (for drain bolt, recommended)
  • Gloves and eye protection

Changing the Coolant: Step-by-Step

  1. Ensure the Engine is Cool
    Remove the skid plate if fitted for easier access to the cooling system. Place the bike on a level stand.
  2. Remove the Radiator Cap
    Loosen the radiator cap to relieve any system pressure – never do this on a hot engine.
  3. Locate and Remove the Drain Bolt
    Position a drain pan under the water pump. The drain bolt is typically found at the lowest point on the right side of the water pump cover. Using the appropriate socket, slowly remove the drain bolt. Allow the coolant to flow out completely.
    Inspect the crush washer or O-ring on the drain bolt. Replace it if there’s any evidence of wear or deformation for proper sealing.
  4. Flush the System (Recommended)
    To maximize protection on the FE501HQ’s advanced four-stroke engine, pour a small amount of distilled water into the radiator after the initial coolant has drained. Replace the radiator cap briefly and run the bike for a minute (do not allow it to heat up). Remove the cap and drain bolt again to expel the flush water. Repeat if the old coolant was heavily contaminated.
  5. Reinstall the Drain Bolt
    Clean the threads, fit a new crush washer or O-ring, and tighten the drain bolt. If you have the torque specification, ensure it is torqued to Husqvarna’s recommended value (usually around 9 Nm, but confirm with your service manual).
  6. Add Fresh Coolant
    With the bike vertical, slowly fill the radiator with manufacturer-approved coolant until just below the filler neck. The FE501HQ cooling system capacity is approximately 1.2L.
  7. Bleed the System
    Gently rock the bike and squeeze the radiator hoses to help remove any trapped air. Top up coolant if the level drops. Refit the radiator cap securely.
  8. Check for Leaks
    Start the engine and let it idle with the radiator cap on. Watch the temperature and check for leaks around the drain bolt and hose connections. Allow the engine to reach operating temperature so any residual air can work its way out; carefully check coolant level after cooling and top up as needed.
  9. Reinstall Skid Plate and Complete Final Checks
    Reinstall the skid plate and all covers. Dispose of old coolant responsibly according to local regulations.

What FE501HQ Owners Should Know

  • OEM vs. Aftermarket Coolants: Husqvarna recommends a non-silicate, aluminum-friendly coolant. If upgrading to performance coolant or installing high-flow hose kits, always verify compatibility with magnesium and alloy components.
  • Routine Checks: Because the FE501 series is often ridden hard in technical terrain, inspect for radiator fin damage and check hose clamp tightness after every few rides.
  • Cooling System Upgrades: Riders in hot environments or racing applications frequently upgrade to high-performance hoses or radiators. Flushing the system thoroughly before any hardware change is crucial to avoid contamination.
  • Unique Model Consideration: The 2020 FE501HQ combines off-road performance with street-legal equipment. Ensure no electrical harnesses are pinched or soaked during coolant changessome models route sensitive wiring close to the radiator shrouds.

Regular coolant changes not only enhance engine longevity but also safeguard against overheating and power losscore needs for the FE501HQ’s dual-purpose capabilities on and off the trails.

Related Shopping Categories

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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.