How to Change the Coolant in a 2009 Husqvarna WR250
Shop parts for a 2009 Husqvarna WR250 Dirt Bike.
Keeping the cooling system fresh on your 2009 Husqvarna WR250 is crucial for reliable trail performance, especially with the high-revving, liquid-cooled two-stroke engine this bike is known for. Routine coolant changes help prevent overheating, corrosion, and water pump wear. Here is a MotoSport-exclusive step-by-step guide for flushing and refilling your WR250's coolant.
What Makes the 2009 WR250's Cooling System Unique?
The WR250 uses a straightforward, dual-radiator layout with a right-side coolant drain bolt on the water pump cover. The aluminum radiators are somewhat vulnerable to impact, so protective guards are recommended for riders tackling rocky terrain. This model relies on coolant flow for steady engine temps, as it lacks an electric fanso regular coolant maintenance is key to avoiding seizures in slow or technical sections.
Tools & Supplies You Will Need
- 8 mm or 10 mm socket (for drain bolt, size varies by production run)
- Drip pan or catch container
- Fresh coolant formulated for aluminum radiators (avoid silicate-based or straight water)
- Distilled water (if doing a system flush)
- Gloves/safety glasses
- Shop rags
Step-by-Step Coolant Change Guide
- Let the engine cool completely to avoid burns or pressurized sprays when opening the radiator cap.
- Secure the bike on a stand so it remains upright and level. This ensures complete coolant drainage.
- Remove the right-side radiator shroud for better access to the radiator cap and water pump.
- Place a catch pan under the water pump cover (on the right side of the cylinder).
- Remove the coolant drain bolt carefullyusually located at the bottom of the water pump housing, often identified by a copper washer.
- Slowly open the radiator cap (right-side, above the expansion tank) to allow air to enterthis boosts flow and fully drains the system.
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Optional: System flush
- Reinstall the drain bolt, fill the system with distilled water, and run the engine for a minute (with radiator cap on).
- Shut off, let cool, remove drain bolt and radiator cap, and drain completely.
- Reinstall and torque the drain bolt with its washer to avoid leaks.
- Fill the radiator slowly with manufacturer-approved coolant until it's just below the filler neck. This prevents trapped air bubbles.
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Bleed air from the system:
- Tilt the bike lightly left and right to help bubbles escape.
- Gently squeeze the radiator hoses by hand.
- Top off with coolant if needed.
- Reinstall the radiator cap securely.
- Start the engine and idle for several minutes. Watch for leaks and monitor coolant level. Shut off, let cool, and re-check the coolanttop up as necessary.
- Reinstall shrouds & graphics, wipe down any spills, and check for proper operation before your next ride.
Model-Specific Tips for WR250 Owners
- Factory radiators are strong, but crash susceptibleadd guards for added durability.
- This engine design circulates coolant rapidly. Always use a coolant rated for high-temperature, competition off-road use.
- Expect to perform coolant changes more frequently if riding in extreme conditions or muddy, slow singletrack typical of enduro events.
- If you see milky coolant or oil contamination, the water pump seal may need attentiona fairly common maintenance item for this engine series.
Stay Cool for Many Miles
Regular checks and changes of the WR250's coolant ensure maximum reliability on both trail and track. If in doubt, perform the entire draining and flushing procedure for peace of mindand always keep fresh, high-quality coolant in your garage. Follow these simple steps, and your Husky will keep pulling strong for many seasons to come.
Related Shopping Categories
Shop Radiators for a 2009 Husqvarna WR250 Dirt Bike.
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Shop Tools for a 2009 Husqvarna WR250 Dirt Bike.
Shop Radiator Hoses for a 2009 Husqvarna WR250 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.