How to Change the Coolant in a 2011 Husqvarna WR150

Shop parts for a 2011 Husqvarna WR150 Dirt Bike.

Proper coolant maintenance ensures that your 2011 Husqvarna WR150 runs at optimal temperature and prevents engine damage. This model uses a liquid-cooled two-stroke engine, requiring periodic coolant changes for best performance. The WR150’s robust and lightweight design makes access to key components straightforward, but always check for proper torque on bolts after maintenance due to its vibration-prone engine.

What You Need

  • Fresh coolant (type and mix as recommended by Husqvarna for your climate)
  • Basic hand tools: sockets, screwdrivers, pliers
  • Drip tray or container for old coolant
  • Funnel
  • Distilled water for flushing
  • Shop towels

Step-by-Step Coolant Change Guide

  • Prep Your Bike
    Make sure the engine is cool. Remove the seat and plastics as needed for access to the radiator cap and drain bolt.
  • Drain Old Coolant
    Place a drip tray under the water pump. Remove the radiator cap completely. Locate the water pump drain bolt (usually at the lowest point on the pump housing) and remove it. Tip: Lean the bike onto its sidestand for maximum drainage. Allow the coolant to fully drain from the system; open the overflow reservoir cap for improved flow.
    The WR150's simple system drains quickly, but ensure all old coolant has run out for best results.
  • Flush the Cooling System
    Replace the drain bolt. Fill the system with distilled water. Reinstall the radiator cap, start the bike, and let it idle for a few minutes. Shut off, drain out the water. Repeat until the drained water is clear.
  • Inspect Hoses & Connections
    Check for cracks or leaks at all hose connections–a WR150 weak point especially if off-road use is heavy. Tighten all clamps.
  • Add Fresh Coolant
    With the drain bolt back, slowly pour your new coolant in through the radiator cap opening. Use the funnel to avoid spills. Fill until the coolant reaches the base of the filler neck and the overflow reservoir sits at the proper mark. The WR150's cooling capacity is modest—do not overfill.
  • Bleed Air from System
    Leave the radiator cap off, start the engine, and let it idle. Watch for bubbles rising in the fill opening, indicating air pockets are escaping. Top off as needed until bubbling stops. Install the cap before coolant starts expanding from heat.
  • Heat Cycle & Recheck
    Run the engine until fully warmed. Let it cool down, then recheck the coolant level in the radiator and the reservoir. The WR150's reservoir will naturally accept overflow when hot, then refill the radiator as the system cools. Top off if the level has dropped.
  • Final Inspection
    Inspect for leaks at the pump, hoses, and reservoir. Take a short test ride, keeping an eye on any signs of overheating. Always retorque critical fasteners after riding; vibration can affect these over time.

WR150 Owner’s Notes

  • The WR150 radiator and cooling system are exposed to roost and trail debris—inspect radiators and guards each maintenance interval.
  • Always use the coolant specified by the manufacturer to avoid corrosion or internal scaling.
  • Before long rides or races, double-check connections and coolant levels as two-strokes run hot under stress.
  • The WR150’s slim frame and engine design make maintenance accessible, but regular checks for leaks and loose clamps are advised.

With these steps, you’ll keep your WR150 running cool no matter where you ride.

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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.