How to Change the Coolant in a 2007 Husqvarna WR125

Shop parts for a 2007 Husqvarna WR125 Dirt Bike.

Proper coolant maintenance is vital for the 2007 Husqvarna WR125’s performance and engine longevity. This step-by-step guide, exclusive to MotoSport.com, outlines the coolant change procedure – and highlights model-specific maintenance tips every WR125 owner should know.

Items You’ll Need

  • Fresh motorcycle coolant (use pre-mixed or mix with distilled water; never use tap water)
  • Drain pan
  • Screwdrivers and socket set (including 10 mm socket)
  • Clean rags
  • Rubber gloves and safety glasses
  • Torque wrench (optional, but recommended for drain bolt reinstallation)

Step-by-Step Coolant Change Procedure

  1. Preparation:
    • Ensure the bike is cool and on a stable stand.
    • Remove the seat and left side panel to access the radiator cap and overflow reservoir.
  2. Remove the Radiator Cap:
    • Slowly loosen and remove the radiator cap to relieve pressure and allow air in for thorough drainage.
  3. Locate and Remove the Drain Bolt:
    • The coolant drain bolt for the 2007 WR125 is typically found below the water pump cover (right side of engine, 10 mm bolt). Place a drain pan underneath.
    • Remove the bolt and allow old coolant to drain completely. Tip: Tipping the bike slightly side-to-side can help evacuate more old fluid.
  4. Flush the System (Optional but Recommended):
    • Reinstall the drain bolt and refill the radiator with distilled water, then run the engine briefly (1-2 minutes, do not let it fully warm up).
    • Drain the system again to remove residual old coolant. Repeat if needed until water runs clear.
  5. Reinstall the Drain Bolt:
    • Fit a new sealing washer if available to prevent future leaks.
    • Tighten securely – do not overtighten; refer to your manual for the correct torque setting.
  6. Refill with Fresh Coolant:
    • Slowly fill the radiator with the appropriate fresh coolant up to the base of the filler neck.
    • Top up the overflow reservoir to its maximum fill line.
  7. Burp the Cooling System:
    • With the radiator cap off, start the bike and let it run for several minutes. Gently rock the bike and blip the throttle to help remove trapped air bubbles.
    • Watch for drops in coolant level; top up as needed. Replace the radiator cap once steady.
  8. Final Checks:
    • Run the bike until the engine reaches operating temperature, then shut it down and let it cool completely.
    • Re-check the coolant levels in both radiator and reserve tank. Add more if necessary.
  9. Reinstall Bodywork:
    • Replace the side panel and seat.
  10. Disposal:
    • Dispose of the old coolant safely at a recycling center or automotive store – do not pour it down drains or onto the ground.

Special Notes for the 2007 Husqvarna WR125

  • This two-stroke model uses a simple, efficient cooling system but is sensitive to trapped air. Fully burping the system is critical to avoid hot spots or overheating.
  • Always check all hose clamps and radiator connections for leaks after servicing.
  • Avoid mixing different coolant types. If switching from one type (e.g., silicate-based to non-silicate), thoroughly flush the system beforehand.
  • Husqvarna WR125 radiators are slightly exposed – check for bent fins and debris; rinse radiators with low-pressure water if needed during service.
  • Consult your owner’s or service manual for precise coolant volume and torque specs.

Regular coolant replacement ensures your WR125 delivers peak performance whether you’re trail riding or racing. For all your maintenance needs, trust MotoSport to keep your bike in top shape.

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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.