How to Change the Coolant in a 2011 Husqvarna WR125: MotoSport Guide
Shop parts for a 2011 Husqvarna WR125 Dirt Bike.Changing the coolant in your 2011 Husqvarna WR125 ensures the engine remains protected from overheating and internal corrosion. The WR125 uses a straightforward but effective cooling system, and even though the process is similar to other dirt bikes, there are model-specific details owners should know. Here's a complete step-by-step guide crafted exclusively for MotoSport.com riders.
What You Need
- Fresh, high-quality motorcycle coolant (preferably premixed, ethylene glycol based, silicate-free)
- Socket set (8 mm – 12 mm wrenches recommended)
- Drain pan
- Clean funnel
- Shop rags
- Protective gloves & eye protection
WR125 Coolant Change Procedure
- Allow the engine to cool fully. Never remove the radiator cap when the engine is hot – hot coolant can spray and cause burns.
- Remove plastics or panels for access. For best access, remove the right side panel and the radiator shroud using the appropriate sockets. This step helps reach the radiator cap and drain bolt easily*.
- Locate & open the radiator cap. Find the cap on top of the radiator. Loosen and remove it to relieve any system pressure and allow air in.
- Place the drain pan. Position a drain pan directly beneath the water pump area – the WR125's coolant drain bolt is located below the water pump housing*.
- Remove the drain bolt. Use an appropriate socket (usually 8 mm or 10 mm) to remove the coolant drain bolt. Allow the coolant to fully drain into the pan. Inspect and replace the aluminum sealing washer on the bolt if worn.
- Flush if desired. You may also disconnect the lower radiator hose at this point and gently flush the system with distilled water to remove residue. Be careful not to introduce debris.
- Reinstall the drain bolt. Replace the sealing washer and reinstall the bolt. Tighten it securely, but do not overtighten.
- Refill with new coolant. Using a clean funnel, slowly pour fresh coolant into the radiator until it reaches just below the filler neck.
- Bleed the cooling system. Gently rock the bike side to side and squeeze the hoses to help release trapped air.
- Start the engine. Run the bike with the cap off for 30–60 seconds to allow bubbles to rise. Watch the coolant level – top off as needed.
- Replace the radiator cap. Install and secure the cap.
- Warm up & recheck levels. Let the bike warm up fully, then turn it off and let it cool. Recheck the coolant level and top off both radiator and overflow/expansion tank as needed.
WR125 Owner Notes:
The 2011 Husqvarna WR125 features a lightweight aluminum twin-radiator system specifically designed for optimal cooling in aggressive off-road riding. Regularly inspect hoses for signs of dry rot or cracking, and ensure the radiator cap spring remains strong for proper pressure. Bleeding out air pockets is crucial after each coolant change, as trapped air can cause overheating and erratic temperature swings. If you lose coolant repeatedly, check the head gasket and water pump seal for leaks.
Performing coolant changes as part of your maintenance schedule not only preserves radiator and engine life but also keeps your WR125 running at its best when the trail heats up.
Related Shopping Categories
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Shop Radiator Hoses for a 2011 Husqvarna WR125 Dirt Bike.
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.