How to Change the Coolant in a 2006 Husqvarna WR250

Shop parts for a 2006 Husqvarna WR250 Dirt Bike.

Keeping the cooling system in your 2006 Husqvarna WR250 in optimal condition is crucial for maintaining peak engine performance and longevity. Regular coolant changes help prevent overheating and minimize corrosion within the cooling system. This proprietary MotoSport guide walks you through a complete coolant change process, with tips specifically relevant to WR250 owners.

Tools & Supplies Needed

  • Fresh motorcycle coolant (pre-mixed or concentrate with distilled water, 50/50 recommended)
  • 10mm wrench or socket for drain bolt and body panels
  • Drain pan
  • Phillips screwdriver (for radiator cap or panels if applicable)
  • Compressed air (optional for thorough flushing)
  • Gloves and shop towels

Step-By-Step Coolant Change Process

  1. Let the bike cool. Ensure the WR250 is fully cool to prevent burns–never remove the radiator cap on a hot engine.
  2. Access the radiator. Remove the seat and shrouds if necessary for clear access to the radiator and hoses.
  3. Drain old coolant.
    • Place a pan beneath the water pump drain bolt (typically found on the lower engine side cover).
    • Remove the radiator cap to let air in and remove the drain bolt. Let all coolant drain out.
  4. Flush the cooling system (recommended).
    • For a full flush, remove the lower radiator hose and use distilled water to rinse the system.
    • For major coolant changes (such as switching coolant types), use compressed air to clear out any remaining fluid through the radiator and engine passages.
  5. Reinstall the drain bolt. Inspect the washer and replace if needed to prevent leaks. Torque gently to manufacturer spec.
  6. Refill with coolant.
    • Pour fresh coolant into the radiator until nearly full, just over the top of the cooling fins but not overflowing.
    • If your coolant is concentrate, always mix with distilled water–never use tap water as it can cause mineral buildup.
  7. Burp the system.
    • With the radiator cap off, start the engine and let it idle for several minutes.
    • Lightly blip the throttle and gently rock the bike to encourage any trapped air bubbles to escape.
    • Top off coolant as needed until at the correct level.
  8. Secure everything. Reinstall the radiator cap, body panels, and seat. Double-check for leaks before riding.
  9. Dispose of old coolant responsibly at a recycling center or auto parts store. Used coolant is toxic and must not be poured down drains or onto the ground.

WR250-Specific Considerations

  • This model uses a high-revving two-stroke engine that runs hotter than four-stroke bikes. Overheating can quickly damage internal components.
  • The WR250's cooling system is relatively simple but sensitive: always use recommended coolants and change fluid regularly, especially after rides in muddy or silty conditions.
  • Monitor cooling system for leakage and pressure. If you notice frequent loss of coolant or oil discoloration, inspect water pump seals and gaskets, as WR250s can develop leaks here over time.
  • Overfilling the radiator can cause excess fluid to be pushed out the overflow as the bike heats up; fill only to the proper level just above the fins.

Pro Tips

  • Always use gloves and eye protection–coolant is toxic and can irritate skin and eyes.
  • Check the radiator cap for any cracks or loss of tension. A weakened cap can cause coolant loss or overheating.
  • If you ride aggressively or in very hot weather, consider upgrading hoses and using a high-performance coolant for added protection.

With regular maintenance, your 2006 Husqvarna WR250 will continue to perform both on the track and trails. For OEM and replacement parts, head to MotoSport for quick access to everything you need to keep your WR250 in peak condition.

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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.