How to Change the Coolant in a 2015 Husqvarna FE350S: MotoSport Guide

Shop parts for a 2015 Husqvarna FE350S Dirt Bike.

Regular coolant changes on your 2015 Husqvarna FE350S are crucial for engine performance and longevity, especially if you ride in high-stress or off-road conditions. Below is a MotoSport-exclusive step-by-step guide tailored specifically to your FE350S, including proprietary tips about its unique features.

Items Needed

  • Fresh, premixed motorcycle coolant (silicate-free, designed for aluminum engines)
  • Basic hand tools (wrench, socket set, pliers)
  • Drain pan and funnels
  • Clean rag
  • Optional: Distilled water for extra flushing
  • Torque wrench (recommended)
  • Safety gloves and eye protection

Step 1: Prep the Bike

  • Ensure the engine is cool before starting. Place the bike upright on a stable, level surface or a stand for maximum drainage.

Step 2: Remove the Radiator Cap

  • Slowly loosen and remove the radiator cap. This releases system pressure and prevents coolant from splashing.

Step 3: Locate and Remove the Coolant Drain Bolt

  • On the FE350S, find the coolant drain bolt on the water pump cover (typically near the right side engine case).
  • Position a drain pan underneath, then remove the bolt along with its sealing washer.
  • Let the coolant fully drain from the system. For complete draining, gently tilt the bike side-to-side.

Step 4: Flush the System (Recommended)

  • For optimal results—especially if previous coolant looks dirty—briefly reinstall the drain bolt by hand and fill the radiator with distilled water.
  • Start the engine and idle for 20–30 seconds, then turn it off, remove the drain bolt again, and drain.
  • Repeat if needed until fluid runs clear.

Step 5: Reinstall the Drain Bolt

  • Check the condition of the drain bolt's seal ring—replace if worn or damaged.
  • Reinstall the bolt and torque it to Husqvarna specs: 10 Nm (7.4 lbf–ft), using a torque wrench when available.

Step 6: Add New Coolant

  • Slowly fill the radiator with premixed coolant up to the base of the filler neck—avoid overfilling.
  • Lightly squeeze the radiator hoses by hand to help release trapped air.

Step 7: Bleed Air from the System

  • Reinstall the radiator cap.
  • Start the bike and let it idle for a few minutes, then stop and carefully recheck the level once cooled. Add coolant if needed.
  • Inspect for leaks around the drain bolt and hoses.

Step 8: Recheck Level After First Ride

  • After your next ride, recheck coolant level and inspect for leaks. Top off if necessary.

Special Considerations for the 2015 FE350S

  • The FE350S features an aluminum engine and twin radiators—always use coolant specifically for aluminum to prevent corrosion and seal failure.
  • The stock cooling system does not include a reservoir; if you frequently ride in hot, slow conditions, aftermarket coolant recovery (expansion) tanks are popular upgrades to reduce overflow and air-pocketing.
  • Routine coolant changes (every 2 years or 20–30 service hours) prevent overheating, corrosion, and premature water pump wear.
  • Inspect radiator fins for mud or debris after off-road rides, as restricted airflow is a common overheating source.

Common Mistakes to Avoid

  • Never mix coolant types—always flush thoroughly if switching brands or formulas.
  • Do not use tap water, as mineral content can cause deposits and engine damage.
  • Be cautious when opening the radiator cap on a hot engine due to pressurized steam.

By following this MotoSport guide tailored to your 2015 Husqvarna FE350S, you'll keep your engine running at optimal temps for seasons to come.

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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.