How to Change the Coolant in a 2001 Husqvarna WR125: A MotoSport Guide
Shop parts for a 2001 Husqvarna WR125 Dirt Bike.
Changing the coolant on your 2001 Husqvarna WR125 is a key maintenance step to keep your two-stroke running cool and strong. This guide covers the full process tailored to your bike, with additional tips unique to the WR125 model year. Use only fresh, high-quality coolant – never straight water – and check manufacturer recommendations for proper mix ratios.
Tools & Supplies Needed
- Socket set (8 mm, 10 mm, 12 mm recommended)
- Catcher pan for old coolant
- Fresh coolant (premixed or concentrate with distilled water)
- Rags and gloves
- Flathead screwdriver or pliers for hose clamps
Step 1: Preparation
- Begin with the bike on level ground and completely cool.
- Remove the seat and fuel tank with scoops and spoilers for full access to the radiator and hoses. The WR125's layout requires tank removal for full cooling system access.
Step 2: Draining the Old Coolant
- Locate the radiator cap. Remove it to release system pressure and allow draining.
- Position your catch pan beneath the engine.
- Loosen hose clamps and disconnect the lower radiator hoses on both radiators. Disconnecting both sides ensures complete coolant removal.
- If you wish, temporarily disconnect electrical connectors near the voltage regulator for easier hose access.
Step 3: Flushing the System (Recommended for Older Coolant)
- To remove all old coolant, you can flush with distilled water. Pour it into the radiator and let it drain through the open hoses.
- For a complete flush, disconnect both radiator hoses and gently blow compressed air through the system. Avoid excessive pressure and protect delicate radiator fins.
Step 4: Reassembly and Filling
- Reconnect all hoses securely; replace any suspect clamps to prevent leaks.
- Pour the fresh coolant into the radiator filler neck slowly until it is full. Check if the WR125 has a coolant reservoir and top to the full mark if equipped.
Step 5: Burping the System
- Leave the radiator cap off. Start the engine and let it idle for several minutes to circulate coolant and release air bubbles. Gently rock the bike or lightly blip the throttle to help trapped air escape.
- Top up the coolant as necessary during this process, then install the cap.
Step 6: Final Checks
- Allow the engine to reach full temperature (the thermostat will open).
- Let the bike cool completely and recheck coolant levels in the radiator and expansion tank (if equipped). Top off as needed.
- Inspect all hose connections for leaks and secure the fuel tank, seat, and all removed bodywork.
Special Notes for the 2001 WR125
- Always check for radiator damage, especially if you ride aggressively – the WR125 is known for its light, flickable chassis but this can expose the radiators in a crash.
- Coolant hoses and radiator guards are vulnerable on older bikes. Inspect closely for wear, upgraded poly hoses or guards are recommended for long-term reliability.
- Never mix different coolant types (ethylene glycol vs. propylene glycol) – if changing formulations, do a thorough flush.
Regular coolant changes every 2 years or 24 months will protect your WR125's performance & longevity. Be sure to dispose of all used coolant safely and in accordance with local regulations. For all your replacement hoses, clamps, radiators, and coolant, MotoSport has you covered.
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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.