How to Change the Coolant in a 2013 Yamaha YZ250F

Shop parts for a 2013 Yamaha YZ250F Dirt Bike.

Keeping the cooling system of your 2013 Yamaha YZ250F in peak condition is critical for engine performance, especially given the high-revving nature of this race-bred four-stroke. Over time, coolant can degrade and lose its effectiveness, potentially leading to overheating. This step-by-step guide, exclusive to MotoSport, will walk you through changing the coolant and highlight model-specific notes for your YZ250F.

What You Will Need

  • High-quality motorcycle coolant (avoid generic automotive brandsuse coolants designed for high-performance engines)
  • Distilled water (if flushing the system)
  • Socket wrench with 8mm socket
  • Drain pan
  • Funnel
  • Shop rags
  • Protective gloves and eye protection

Step-by-Step Coolant Change Guide

  1. Ensure the Bike is Cool
    Only change the coolant when the engine is completely cool to prevent burns or engine damage.
  2. Remove the Skid Plate (if equipped)
    Some 2013 YZ250F models include a skid plate. Remove it for easier access to the water pump drain bolt.
  3. Take Off the Radiator Cap
    Place a rag over the radiator cap as you remove it to avoid any possible spray. This step releases system pressure and allows coolant to drain freely.
  4. Locate the Water Pump Drain Bolt
    On the 2013 YZ250F, the coolant drains via a bolt on the water pump cover, found on the right side of the engine. Position your drain pan beneath this area.
  5. Remove the Drain Bolt
    Use your 8mm socket to unscrew the bolt fully, letting the old coolant pour into the pan. Loosen the radiator cap further if flow seems slow. Allow coolant to drain completely.
  6. Flush the System (Optional but Recommended)
    For optimal maintenance, after the old coolant has been drained, reinstall the drain bolt (finger tight), fill the radiator with distilled water, then run the engine for 2-3 minutes to circulate. Shut off, allow to cool, drain again, then repeat if coolant was especially dirty.
  7. Reinstall the Drain Bolt
    Tighten the drain bolt securely but do not overtighten to prevent damaging the water pump cover threads.
  8. Add New Coolant
    Using a funnel, slowly fill the radiator to the very top with the recommended motorcycle coolant. Check your owner's manual or decal on the bike for coolant capacity and specifications. Typical fill for this model year is about 0.55 to 0.60 liters.
  9. Bleed the System
    With the radiator cap still off, start the engine and let it idle briefly. Gently rock the bike side-to-side and tap the radiator hoses to encourage air bubbles to escape. Watch for the coolant level to drop; add more if needed.
  10. Reinstall the Radiator Cap
    Once no more bubbles rise and the level is steady, reinstall the cap securely.
  11. Check for Leaks
    Inspect around the drain bolt, hoses, and radiator for any drips or seepage. Address any loose fasteners or connections.
  12. Dispose of Old Coolant Properly
    Used coolant is toxicbring it to an appropriate recycling or hazardous waste facility.

2013 Yamaha YZ250F Model-Specific Notes

  • The 2013 YZ250F uses an aluminum radiator; avoid mixing coolant types, as some formulas (like silicate-based) can damage internal passages over time.
  • Inspect radiator shrouds and the cap seal during coolant changescracks or poor sealing can lead to overheating.
  • This model's cooling passages are relatively narrow for weight savingsregular coolant changes prevent deposits that can limit flow.
  • If racing or riding in hot climates, consider upgrading to a high-performance or racing-specific coolant for enhanced thermal protection.

When to Change Coolant

Yamaha recommends changing the coolant at least once a year (or every 2 race seasons), but if you ride in extreme conditions or race often, inspect and replace more frequently as needed.

Final Tips

  • Always use a motorcycle-rated coolant for aluminum enginesautomotive antifreeze can cause excessive corrosion or gasket swell.
  • Mark a reminder in your maintenance log each time you service the coolant.
  • After your first post-change ride, double check coolant levels once the engine is coolair can take time to fully work out of the system.

Related Shopping Categories

Shop Radiators for a 2013 Yamaha YZ250F Dirt Bike.

Shop Coolant for a 2013 Yamaha YZ250F Dirt Bike.

Shop Temperature Sensors for a 2013 Yamaha YZ250F Dirt Bike.

Shop Tools for a 2013 Yamaha YZ250F Dirt Bike.

Shop Radiator Hoses for a 2013 Yamaha YZ250F 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.