How to Change the Coolant in a 2021 Husqvarna FE501S

Shop parts for a 2021 Husqvarna FE501S Dirt Bike.

Keeping your 2021 Husqvarna FE501S running at peak performance means timely maintenance–and a coolant change is a must for reliable cooling, especially if you ride hard or in tough conditions. Here is MotoSport's step-by-step proprietary guide tailored for your FE501S.

Preparation

  • Let the engine cool completely. Work only when the engine is cold to avoid burns–the system is under pressure when hot and hot coolant can cause serious scalding injuries.
  • Place the bike upright on a stable surface.
  • Gather your tools: drain pan, socket or wrench for drain bolt, fresh coolant (1.2 liters recommended), funnel, and a replacement seal ring for the drain bolt.
  • Always wear gloves and eye protection.

Draining the Old Coolant

  • Remove the radiator cap first to release system pressure and allow better drainage.
  • Locate the coolant drain bolt at the lower part of the engine water pump cover (right side of the bike). Hold your drain pan underneath.
  • Loosen and remove the drain bolt. Allow coolant to drain fully from the engine and radiators.
  • If desired, flush with distilled water: reinstall the bolt, add water, run the engine briefly, then drain again for extra cleanliness.

Installing New Coolant

  • Reinstall the drain bolt using a new seal ring to prevent leaks. Torque the bolt to manufacturer spec if you have a torque wrench.
  • Use a funnel to slowly fill the radiator until coolant reaches the neck. The FE501S takes approximately 1.2 liters (check your owner's manual for the exact capacity). MotoSport recommends high-performance coolants for competition or harsh riding environments.
  • With the cap off, gently rock the bike side to side to work out air bubbles. As bubbles escape, you may need to add a bit more coolant.

Final Steps and Checks

  • Replace and secure the radiator cap.
  • Start the engine and let it idle for 1–2 minutes, then shut off and check the coolant level once more. Top off if needed.
  • Inspect for leaks around the drain bolt and radiators. Wipe up any spills and re-check that all bolts and caps are tight.

Important Notes for the 2021 FE501S Owner

  • The 2021 FE501S shares its cooling system design with KTM/Husqvarna enduro models. It has robust radiators but benefits from routine maintenance to avoid overheating, especially if ridden in slow, technical terrain.
  • Consider adding a coolant overflow/reservoir kit for extreme riding or hot climates, as this can help reduce the risk of overheating–a simple upgrade for long-term reliability.
  • If you notice frequent coolant loss, check the radiator cap and hoses for any signs of wear or leaks–these are common areas to fail in off-road conditions.
  • Always use a high-quality, motorcycle-specific coolant. Avoid automotive types that can damage seals or lead to premature wear.

Changing your FE501S coolant is straightforward and pays dividends in engine durability. For all your parts, coolant, and upgrade kits, MotoSport keeps every rider 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.