How to Change the Coolant in a 2004 Husqvarna WR360

Shop parts for a 2004 Husqvarna WR360 Dirt Bike.

Maintaining the cooling system on your 2004 Husqvarna WR360 is critical for peak performance and engine longevity. This guide covers everything WR360 owners need to know for a smooth, thorough coolant change, as well as some essential notes specific to this legendary 2-stroke enduro.

What You–ll Need

  • Coolant compatible with aluminum engines (silicate-free recommended)
  • Catcher pan for old coolant disposal
  • Socket and spanners
  • Phillips screwdriver (for shrouds or drain screw access)
  • Funnel
  • Gloves and rags

Coolant Change Instructions

  1. Preparation: Make sure the engine is completely cool. Place your bike on a stable stand. Remove the seat and radiator shrouds if needed for easier access to the radiators.
  2. Locate the Drain Bolt: On the WR360, the coolant drain bolt is typically found at the base of the water pump cover on the right side of the engine. Position a catch pan underneath to collect the old coolant.
  3. Remove Radiator Cap: Slowly open the radiator cap on the right-hand radiator to vent the system. This helps coolant flow freely when draining.
  4. Drain Old Coolant: With your catch pan ready, loosen and remove the drain bolt/water pump cover bolt. Allow all coolant to fully drain. For a more thorough flush, gently tilt the bike side to side.
  5. Optional–Flush for Maximum Cleanliness: If coolant is particularly dirty or you–re switching types, flush the system with distilled water. Fill, start the engine briefly, then drain again.
  6. Replace the Drain Bolt: Inspect the sealing washer for wear–replace if needed. Reinstall and gently tighten the drain bolt.
  7. Add New Coolant: Using a funnel, slowly pour fresh coolant into the right-hand radiator until full. Fill to the base of the radiator neck when the bike is upright. Husqvarna recommends a 50/50 mix of high-quality ethylene glycol-based coolant and distilled water.
  8. Bleed the System: With the cap off, kickstart the bike and let it idle for 1–2 minutes. This helps purge trapped air. Top off coolant if the level drops.
  9. Secure Everything: Reinstall the radiator cap and any removed bodywork.

WR360 Owner Tips & Model-Specific Notes

  • The 2004 WR360 radiator system uses a simple, traditional layout–there is no overflow reservoir. Always fill and check via the right-side radiator neck.
  • Monitor for leaks at radiator seams and the water pump after refilling, as aging bikes may develop gasket or seal issues.
  • The WR360 engine is known for significant heat build-up on slow trails. Frequent coolant changes and using a quality coolant are essential for optimal protection.
  • Always dispose of old coolant responsibly.

Regular coolant replacement on your 2004 Husqvarna WR360 keeps your two-stroke running cool, crisp, and reliable, whether racing or hitting technical terrain. If fasteners, gaskets, or radiators need refreshing, MotoSport stocks Shop parts for a 2004 Husqvarna WR360 Dirt Bike..

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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.