How to Change the Coolant in a 2013 Husqvarna WR125 – MotoSport Guide
Shop parts for a 2013 Husqvarna WR125 Dirt Bike.Keeping your 2013 Husqvarna WR125 running cool is crucial for performance & longevity. Regular coolant changes help prevent engine overheating and protect internal components. Follow this MotoSport-exclusive guide for your WR125.
Tools & Supplies Needed
- Socket set (typically 10 mm for drain plug)
- Catch pan for old coolant
- Fresh motorcycle coolant (manufacturer recommended, premixed or as directed)
- Distilled water (if mixing coolant)
- Rags & gloves
Step-by-Step Coolant Change Procedure
- Let the engine cool. Never open the radiator cap on a hot engine to avoid scalding.
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Remove radiator cap. On the WR125, turn and loosen the radiator cap. Some models may have a small screw securing the cap; ensure it is removed first.
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Locate the coolant drain bolt. Typically, it is positioned near the water pump at the lowest part of the cooling system. Use your socket to unscrew the drain bolt carefully (if unsure, reference the owner's manual or check beneath the exhaust).
- Drain the old coolant. Place your catch pan under the drain bolt – open the bolt and allow coolant to fully drain. Remove the overflow reservoir cap to promote complete drainage.
- Inspect the coolant. Look for signs of contamination (oily, rusty, or cloudy fluid). These could indicate issues requiring deeper service.
- Reinstall the drain bolt. Clean the bolt, replace any worn sealing washer for a leak-free seal, and torque to OEM specification.
- Refill with new coolant. Add coolant slowly into the radiator until it reaches the top of the filler neck. Fill the overflow reservoir to the "Full" mark.
- Burp the system. Start the engine with the radiator cap off. Briefly run the bike and gently blip the throttle or rock the bike to dislodge air pockets (air trapped reduces cooling efficiency). Watch fluid level, top off as needed.
- Replace the radiator cap. Once no more bubbles rise and the level stabilizes, securely fit the cap.
- Check for leaks. Run the engine up to temperature, scan for seepage around the drain bolt, hose connections, and radiator cap.
- Final coolant check. After the bike has fully cooled, recheck levels in both the radiator and the overflow tank, topping off if needed as coolant contracts.
MotoSport Tips & Special WR125 Notes
- The WR125 features a compact, high-revving two-stroke engine – it's sensitive to overheating, so use fresh coolant and double-check for trapped air after refilling.
- Always use distilled water if you must mix concentrate coolant. Tap water will leave mineral deposits in your radiator, reducing cooling efficiency over time.
- After any coolant service, walk around the bike with a torque wrench to check all accessible fasteners – vibration can loosen engine and frame bolts over time.
- If the bike doesn't seem to drain properly, try leaning the WR125 onto its sidestand during draining. Some Husqvarna cooling systems drain better when tilted, as the drain hole sits lower on one side.
- Dispose of used coolant properly at your local recycling center. Coolant is toxic – never pour it down drains or onto the ground.
- If coolant levels drop repeatedly after service, check for leaks, bad gaskets, or possible air trapped inside. Persistent leaks signal the need for further inspection.
Maintenance Schedule Reminder
Flush & replace your coolant each season or after extensive riding in hot conditions. Your WR125 will reward you with cooler, more reliable performance all year.
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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.