How to Change the Coolant in a 2011 Husqvarna WR250: MotoSport Exclusive Guide

Shop parts for a 2011 Husqvarna WR250 Dirt Bike.

Routine coolant changes are a must for keeping your 2011 Husqvarna WR250 running cool – whether you're hitting hard on the singletrack or climbing steep hills. Proper cooling system maintenance prevents overheating, extends the life of your engine, and keeps peak performance on every ride. This MotoSport guide walks you through changing the coolant in your WR250 so you can ride with confidence and know-how.

What Makes the 2011 Husqvarna WR250 Cooling System Unique?

The 2011 WR250 is a legendary 2-stroke with a radiator setup tailored for aggressive off-road use. Unlike many street bikes, it lacks a thermostat and instead relies on radiator shroud airflow and high-capacity, side-mounted radiators for cooling. Radiator hoses connect directly to the water pump and head, making coolant replacement straightforward yet critically important for reliability. Always use high-quality, dirt bike-specific coolant formulated for aluminum components to prevent corrosion and maximize protection.

Tools & Supplies Needed

  • New engine coolant (check your manual for capacity and type – silicate-free, 2-stroke compatible)
  • Socket set or T-handle (8 mm or 10 mm common sizes)
  • Phillips screwdriver
  • Rag or funnel
  • Drain pan
  • Personal safety gear (gloves, eyewear)

Step-By-Step: Changing Your WR250 Coolant

  • 1. Cool Down & Access
    Park your bike on a stable surface and let the engine fully cool—never open a hot radiator cap. Remove the seat and left radiator shroud for easier access if needed.
  • 2. Remove the Radiator Cap
    Twist off the radiator cap slowly to relieve any pressure. This allows coolant to drain freely.
  • 3. Find & Remove the Drain Bolt
    The WR250 has a coolant drain bolt located at the lowest point on the water pump cover (typically on the right side). Place your drain pan under the water pump. Loosen the drain bolt and let all the old coolant flow out. Some bikes have a copper sealing washer on the drain bolt; inspect and replace if worn.
  • 4. Flush If Swapping Coolant Types
    If you're switching from conventional to a different type (like Evans or Engine Ice), flush the system with distilled water. Fill the radiator with distilled water, run the engine briefly, let cool, and drain again. Repeat until the draining water runs clear.
  • 5. Refit the Drain Bolt
    Clean the drain bolt threads. Reinstall the bolt (and washer, if used) and tighten securely but do not over-torque.
  • 6. Fill with New Coolant
    Using a funnel, pour the new coolant slowly into the radiator until it reaches the filler neck. Slightly shake the bike or gently squeeze radiator hoses to burp air bubbles out of the system. Top off if needed.
  • 7. Bleed the System
    With the radiator cap still off, start the bike and let it idle for a minute. Watch for bubbles to escape and coolant level to drop—add more if needed. Turn off the bike, let it settle, then top up as required. Replace and tighten the radiator cap.
  • 8. Check for Leaks & Test Ride
    Wipe down the engine and hoses, check for leaks at the drain bolt and hose connections. Reinstall the shrouds and seat, then take a short ride. Re-check coolant level after the first ride and top up if necessary.

WR250 Owner Tips

  • Inspect radiator hoses and clamps for any wear or cracks during coolant changes.
  • Watch for signs of cooling system contamination (rust, oil, or debris in old coolant) that could indicate a failing water pump seal or head gasket.
  • Always check the coolant more frequently in warm weather or when pushing the bike hard on technical trails.
  • The WR250's two-stroke engine benefits from regular coolant changes because premix oil in the exhaust won't contaminate the coolant, but overheating has a greater risk of seizing the motor compared to four-strokes.

Staying ahead on scheduled coolant changes protects your investment and maximizes your rides. For quality replacement coolants, hoses, and other cooling system components for your 2011 Husqvarna WR250, MotoSport has you covered.

Related Shopping Categories

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Shop Radiator Hoses for a 2011 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.