How to Change the Coolant on a 2015 Husqvarna FE501HQ

Shop parts for a 2015 Husqvarna FE501HQ Dirt Bike.

Keeping your 2015 Husqvarna FE501HQ running cool is crucial for engine longevity and performance, especially if you push your bike hard on the trails or track. Changing the coolant is straightforward, but attention to detail ensures you avoid overheating and keep your cooling system healthy. Here's a MotoSport-exclusive guide, written specifically for FE501HQ owners.

Tools & Supplies Needed

  • Fresh engine coolant (ready-to-use or concentrate mixed with distilled water)
  • Catching pan for old fluid
  • Socket wrench set (for drain bolt, shrouds or tank if necessary)
  • New sealing washer for the drain bolt (recommended)
  • Funnel (for easier refill)
  • Clean cloths for spills
  • Distilled water (if flushing or mixing concentrate)

Step 1: Preparation

  • Make sure the engine is completely cool. Hot coolant can cause serious burns.
  • Stand your FE501HQ upright and stable using a center stand or suitable bike lift. Keeping the bike level ensures a complete drain and accurate refill.
  • Remove the seat and tank shrouds if they limit access to the radiator cap. On this model, you may need to slightly move the gas tank for full accessbe careful with fuel lines and mounting bolts.

Step 2: Draining the Old Coolant

  • Place a catch pan below the water pump area on the right side of the engine cases.
  • Slowly open the radiator cap to release any residual pressure in the system.
  • Locate and remove the coolant drain bolt at the base of the water pump. Some coolant may gush out quickly, so have your pan in position.
  • Let the coolant drain completely from both radiators for several minutes.
  • If you want to flush, fill the system with distilled water, reinstall the drain bolt, and briefly run the bike for less than a minute. Allow to cool, then repeat the drain. This helps remove residues and old coolant.

Step 3: Inspect the System

  • Check radiator hoses for cracks or stiffnessreplace if needed.
  • Inspect hose clamps and radiator fins for damage. Bent fins can be carefully straightened with a small screwdriver.
  • Replace the sealing washer on your drain bolt for leak-free operation.

Step 4: Refilling with Coolant

  • Reinstall the drain bolt and torque it to spec.
  • Pour fresh coolant into the radiator until the filler neck is full. For the FE501HQ, the capacity is about 1.2 liters.
  • Rock the bike gently from side to side to release trapped air bubbles.
  • Start the engine and let it idle. Gently rev a few times to help the system bleed air. Watch the coolant level in the radiator neck and top off as necessary during this process.
  • Check for leaks at the drain bolt and hose connections.
  • Replace the radiator cap and refill the coolant expansion reservoir to the "full" mark if your model is equipped with one.

Step 5: Final Checks

  • Reinstall any plastics, the seat, and ensure all bolts are tightened to manufacturer specs.
  • After the first ride, let the engine cool, then recheck coolant levels and inspect for leaks.

2015 FE501HQ Model-Specific Notes

  • The FE501HQ uses a modern, high-compression engine that generates significant heat. Using a high-quality coolantespecially if you ride in hot or slow-speed conditionsis recommended to prevent overheating.
  • The 2015 cooling system is robust but sensitive to air pockets. Bleed thoroughly to avoid hot spots and poor coolant circulation.
  • If your model came equipped with an aftermarket fan or you've installed one, inspect its function during the process. Fans are a popular addition for hard enduro riders.
  • Never mix old-style green coolant with modern silicate-free coolants, as gelling and corrosion can occur.

Changing the coolant on your Husqvarna FE501HQ is one of the simplest but most important maintenance jobs. Doing it the MotoSport way saves money, ensures reliability, and keeps your dirt bike ready for whatever the trail throws at you.

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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.