How to Change the Coolant in a 2006 Husqvarna CR125

Shop parts for a 2006 Husqvarna CR125 Dirt Bike.

The 2006 Husqvarna CR125 is a legendary 2-stroke race machine favored for its agility, lightweight chassis, and reliable engine. To keep this high-revving dirt bike running at peak performance, regular maintenance—including coolant changes—is essential. Here's a robust, step-by-step guide specific to your CR125, highlighting key tips unique to this model.

Why Coolant Change Matters

Old coolant loses its ability to protect the engine from overheating and internal corrosion. Especially with the CR125's high-revving 125cc engine, fresh coolant is critical for engine reliability and preventing seizure.

Required Tools & Supplies

  • Fresh motorcycle coolant (pre-mixed or mixed with distilled water–never use plain tap water)
  • Drain pan
  • Socket set and wrenches
  • Flathead screwdriver
  • Clean rags
  • Protective gloves

Step-by-Step Coolant Change for Husqvarna CR125 (2006)

  1. Preparation:
    • Ensure the bike is completely cool and placed upright on a level surface.
    • Remove the seat and side panels (if needed) for better radiator access.
  2. Draining the Coolant:
    • Locate the coolant drain bolt on the water pump's right side.
    • Position the drain pan below the water pump.
    • Slowly open the radiator cap to release any pressure before removing the drain boltthis helps prevent a sudden gush of coolant .
    • Use a wrench to remove the drain bolt and allow all fluid to drain into the pan.
  3. Flushing the System (Recommended):
    • Replace the drain bolt temporarily.
    • Fill the radiator with distilled water.
    • Reinstall the radiator cap, run the engine for a few minutes, then allow it to cool.
    • Repeat draining to flush out remaining contaminants. Repeat until only clean water drains.
    • Remove the cap and drain bolt for the final drain.
  4. Reinstall Drain Bolt:
    • Inspect the drain bolt and sealing washer for wear. Replace if needed.
    • Tighten the bolt securely, but do not overtighten–aluminum cases are easily stripped.
  5. Adding New Coolant:
    • Pour the correct amount of fresh coolant into the radiator (typically until it reaches the top of the filler necksee your manual for exact capacity) .
    • If using concentrate, always mix with distilled water to prevent mineral buildup inside radiators .
  6. Bleeding Air from the System:
    • With the cap off, start and briefly run the engine. Gently rock the bike or blip the throttle to help bubbles escape. Top up coolant if the level drops .
    • Once no more bubbles rise and coolant remains steady at the top, install the radiator cap.
    • After a short ride, let the engine cool fully and recheck coolant level, topping off if necessary.

Special Tips for the 2006 CR125 Owner

  • The CR125's narrow twin radiators and high-strung motor are particularly sensitive to overheating—always check for proper hose attachment and look for leaks at all hose clamps after servicing .
  • If your cooling system uses OEM hoses, inspect for cracks or hardening; they can deteriorate quicker in older models.
  • Never mix coolant brands or types–flushing thoroughly is critical when switching formulas to prevent internal gelling .
  • Check that the radiator cap is properly seated and tightened with both clicks for optimum pressure retention.

Pro Maintenance Pointers

  • Always dispose of old coolant properly—never pour it down the drain or on the ground. Use an authorized recycling center.
  • Consider replacing the radiator cap or hoses if they show signs of age for consistent cooling system performance.
  • Schedule a coolant change every year, or sooner for frequent racers or heavy off-road use.

By keeping your 2006 Husqvarna CR125's coolant fresh, you prevent overheating, safeguard critical engine components, and ensure your bike is always ready for top performance on the trails or track.

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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.