How to Change the Coolant in a 2016 Husqvarna FE501S

Shop parts for a 2016 Husqvarna FE501S Dirt Bike.

Regularly changing the coolant in your 2016 Husqvarna FE501S keeps your high-performance engine running cool, protects it from overheating, and extends its lifespan. The FE501S uses a high-compression SOHC engine and is renowned for granting exceptional torque and responsiveness–qualities that depend on effective cooling. Below are detailed, model-specific steps to make this crucial maintenance task simple and effective.

What You Need

  • High-quality motorcycle coolant (ensure it's silicate-free for aluminum systems)
  • Basic hand tools (8mm or 10mm socket for the drain bolt; screwdriver for shrouds if needed)
  • Catch pan
  • Distilled water (for flushing, if desired)
  • Replacement sealing washer for the drain bolt (recommended)
  • Protective gloves
  • Shop rags

Step-by-Step Coolant Change for the 2016 FE501S

  1. Preparation:
    • Ensure the engine is completely cold before beginning.
    • Place the bike upright on a stand for best access to the cooling system.
    • Remove the seat and left radiator shroud if needed for easier access.
  2. Remove Radiator Cap:
    • Locate and slowly loosen the radiator cap to release any residual pressure from the cooling system. This allows coolant to drain freely from the system.
  3. Drain the Old Coolant:
    • Find the coolant drain bolt on the lower side of the engine case near the water pump on the right.
    • Position a catch pan under the bolt. Remove the drain bolt completely.
    • Allow all coolant to drain from the radiators and engine. Tilting the bike slightly may help remove trapped coolant from both radiators.
  4. Flush System (Optional):
    • If the old coolant is dirty or has not been changed for a while, fill the system with distilled water, reinstall the drain bolt temporarily, and run the bike briefly with the radiator cap off (don't let it heat up.)
    • Drain the distilled water the same way as above to help remove remaining residue.
  5. Reinstall Drain Bolt:
    • Inspect the drain bolt and replace the sealing washer if worn or damaged to prevent leaks.
    • Tighten the bolt securely – do not overtighten as the threads are soft aluminum.
  6. Add New Coolant:
    • Pour new coolant into the radiator filling neck slowly until the level reaches just under the neck. OEM specification is approximately 1.2L for total capacity.
    • If your coolant requires mixing, always use distilled water; never use tap water.
  7. Burp the Cooling System:
    • With the radiator cap still off, briefly start the engine. Gently rock the bike or blip the throttle to help remove air bubbles from the system.
    • Shut the engine off after a minute and top off the coolant as needed.
    • Replace the radiator cap securely.
  8. Finish Up:
    • Wipe any spilled coolant from the engine or frame.
    • Reinstall the seat and shrouds.
    • Dispose of used coolant at a recycling center–do not pour it down the drain.
    • After your next ride, recheck the coolant level and add more if necessary as air may continue to bleed out of the system after initial operation.

Model-Specific Notes for the 2016 FE501S Owner

  • The FE501S shares much of its cooling system architecture with KTM off-road models but has street-legal equipment and a thermostat in certain configurations. Always check that no coolant is lost from vent or overflow hoses post-servicing, especially if you ride street and trail both.
  • Inspect radiator hoses for wear–the FE501S's radiator mounting can sometimes cause hoses to rub, especially after hard enduro rides.
  • Mishandling the radiator cap or overtightening the plastic drain plug can damage the cooling system–use appropriate torque and care.
  • High performance or extreme-condition riders may wish to upgrade to a high-performance coolant or install an auxiliary radiator fan, depending on riding environment.
  • If your bike has factory emission and evaporative hardware, ensure all small lines are routed as intended after the job is finished.

Changing your coolant is simple, essential maintenance that helps your FE501S deliver top performance on every ride. Always consult your owner's manual for torque specs and follow MotoSport's trusted service tips to keep your ride in championship form.

Related Shopping Categories

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Shop Radiator Hoses for a 2016 Husqvarna FE501S 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.