How to Change the Coolant in a 2008 Husqvarna CR125

Shop parts for a 2008 Husqvarna CR125 Dirt Bike.

Changing the coolant on your 2008 Husqvarna CR125 is an essential maintenance step to keep your bike running at optimal temperatures and ensure engine longevity. The liquid-cooling system on this two-stroke model is relatively straightforward, but as with any dirt bike, following the correct procedure and using proper coolant is key to consistent performance and reliability.

What Makes the 2008 Husqvarna CR125 Unique?

The 2008 CR125 features a high-revving two-stroke engine with a liquid-cooled system designed for aggressive riding. It's essential to maintain the cooling system diligently, as overheating or using the wrong coolant type can impact the engine's performance and durability. Always ensure the bike is completely cool before beginning any work on the cooling system, and never open the radiator cap when the engine is hot—you risk severe burns from pressurized steam or coolant.

Tools & Materials Needed

  • 8mm or 10mm socket wrench (check your drain bolt size)
  • Drain pan
  • New copper washer (recommended for drain bolt resealing)
  • Glycol-based coolant suitable for aluminum engines, premixed or distilled water for concentrate
  • Rags and gloves

Step-by-Step Coolant Change Guide

  1. Let the bike cool completely: Always work on the cooling system when the bike is at room temperature. Coolant and radiator systems can be dangerously hot and under pressure after a ride.
  2. Remove the radiator cap: Set the bike securely on its stand. Remove the radiator cap to allow air in, which helps the coolant drain out faster.
  3. Locate the coolant drain bolt: On the CR125, the drain bolt is usually found at the bottom of the water pump cover on the right side of the engine.
  4. Position a drain pan beneath the water pump and loosen the drain bolt. Fluid should begin to flow out rapidly. Tilting the bike slightly on its side stand can help improve drainage, especially if the drain location is not at the bottom-most point when the bike is vertical.
  5. Optional: Remove the hoses: For a more thorough flush – especially if changing coolant types or if the old coolant has become contaminated – you can remove the lower radiator hose and use compressed air to blow out any residual fluid.
  6. Reinstall the drain bolt once all old coolant is out. Clean the threads and install a new copper washer if possible. Torque the bolt to manufacturer spec (typically about 10 Nm, but verify for your model).
  7. Refill the system: Pour in glycol-based motorcycle coolant designed for aluminum cooling systems. If using concentrate, always mix only with distilled water. Fill until the level is at the top of the radiator neck.
  8. Bleed out trapped air: Gently rock the bike or squeeze the radiator hoses to remove trapped air. Leave the cap off and add coolant if the level drops as air escapes.
  9. Replace the radiator cap and start the engine. Let it idle until it warms up and allow the thermostat to open. Turn off the engine, let it cool, and check the coolant level again, topping up as necessary.

Additional Tips for CR125 Owners

  • Check for cracks or leaks in the radiator or hoses—older Husqvarna models may develop leaks at the hose connections or seams.
  • If you ride in muddy or sandy terrain, clean your radiator fins regularly to prevent airflow blockages.
  • Track or aggressive trail riding can quickly overheat a two-stroke. Ensure proper coolant level before every ride for engine safety.
  • Consider carrying spare coolant and a small tool kit–a quick fix on the trail can prevent a blown top-end in harsh conditions.

Regularly replacing your coolant, ideally once a season or after heavy use, is one of the best ways to protect your 2008 Husqvarna CR125 from overheating and costly engine damage.

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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.