How to Change the Coolant in a 2013 Husqvarna WR300

Shop parts for a 2013 Husqvarna WR300 Dirt Bike.

Routine coolant changes are essential for keeping your 2013 Husqvarna WR300 performing at its best. While the process is straightforward, WR300 owners should pay attention to a few details unique to this two-stroke powerhouse. Follow these step-by-step instructions made exclusively for MotoSport customers to ensure a thorough and trouble-free coolant service.

Tools – Parts – Fluids You'll Need

  • Drain pan
  • Socket or wrench to fit the drain bolt
  • Coolant rated for off-road motorcycle use, premixed or ready to mix (consult owner's manual for type and quantity)
  • Funnel
  • Clean rags
  • Safety gloves and goggles
  • Optional: distilled water (for flushing, if desired)

Step-by-Step Coolant Change

1. Preparation

  • Ensure the engine is fully cool before you begin to prevent burns.
  • Place the bike on a stable stand in a well-ventilated space.
  • Remove the radiator shrouds if they block access to the radiator cap or drain bolt (most 2013 WR300s allow access without removal).

2. Drain the Old Coolant

  • Position the drain pan under the water pump area on the lower right side of the engine.
  • Remove the radiator cap to break the vacuum and allow faster draining.
  • Using the appropriate tool, loosen and remove the coolant drain bolt (usually found on the water pump cover or lower side of the engine).
  • Allow all coolant to fully drain from both radiators.

3. Optional: Flushing the System

  • If switching coolant types or if the old coolant was dirty, flush the system by reinstalling the drain bolt, filling the system with distilled water, running the engine briefly, and draining again. Repeat if necessary.
  • Never use tap water, as minerals can cause corrosion or scaling over time.

4. Install Drain Bolt

  • Wipe the drain bolt and sealing surface clean.
  • Install the drain bolt, tightening to manufacturer specification (do not overtighten, as the threads are often soft).

5. Fill with Fresh Coolant

  • Slowly pour fresh coolant into the radiator until nearly full. Use a funnel to avoid spills.
  • On the WR300, air tends to trap in the system–to release it, gently tip the bike side-to-side at least 45 degrees to encourage air pockets to rise. Add a few ounces of coolant at a time and repeat the process. Rock the bike gently front-to-back while squeezing the radiator hoses to help burp remaining air. Listen for gurgling, which indicates air escaping.
  • Top off until coolant is visible at the base of the radiator filler neck and no more air bubbles appear.

6. Bleed – Check – Reassemble

  • Replace the radiator cap securely.
  • Reinstall any shrouds if removed.
  • Start the engine and let it idle until warm. Watch coolant level and check for leaks. Once cooled, re-check the coolant level and top off if needed.

Model-Specific Tips for the 2013 WR300

  • The WR300's two-stroke performance produces more heat than similar trail bikes–never neglect cooling system maintenance.
  • Inspect radiator hoses and clamps closely for aging or cracking; replace if softness or bulging is detected.
  • The cooling system holds a modest amount of coolant. Always double-check levels after your first ride.

Recommended Change Interval

  • Change coolant every two years or per your riding conditions (more frequently for heavy off-road use or if muddy water or debris contaminate the system).

Aftercare

  • Properly dispose of the old coolant in accordance with local regulations. Coolant is toxic to animals and harmful to the environment.

Keeping your WR300's cooling system fresh is a simple step that pays big dividends in performance and reliability. If you need replacement hoses, caps, or genuine Husqvarna coolant, MotoSport has all the parts to make your next ride worry-free.

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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.