How to Change the Coolant in a 2013 Kawasaki KLX250S

Shop parts for a 2013 Kawasaki KLX250S Dirt Bike.

Changing the coolant on your 2013 Kawasaki KLX250S is an essential maintenance step that helps prevent overheating and protects the engine from corrosion. This step-by-step guide is tailored specifically to your KLX250S–not just any generic dirt bike–highlighting factory details and practical tips every owner should know. Always work with the engine cool to the touch to avoid burns.

What You—ll Need

  • Fresh, compatible motorcycle coolant (avoid automotive coolant)
  • Circuit-approved funnel
  • Drain pan
  • 10 mm socket or wrench
  • Phillips screwdriver
  • Distilled water (if you plan to flush the system)
  • Clean rags
  • Protective gloves

Procedure: Step-By-Step

  1. Remove Body Panels
    To access the radiator cap and overflow reservoir, gently remove the side panels and seat using a Phillips screwdriver and a 10 mm socket.
  2. Drain Old Coolant
    Position the drain pan below the water pump drain bolt–find it on the lower right side of the engine. Remove the radiator cap to release system pressure, then remove the drain bolt. Let the old coolant flow into the pan. Some coolant may also remain in the overflow tank; drain this by disconnecting it from the bike and emptying the contents.
  3. Flush (Optional but recommended)
    For a thorough job, pour a small amount of distilled water into the radiator, reinstall the drain bolt, and briefly start the engine to circulate. Then, repeat the drain process. This removes residual old coolant or debris that could harm your cooling system down the line.
  4. Reinstall Drain Bolt
    Ensure the drain bolt and gasket are clean and in good shape; tighten securely but avoid overtightening.
  5. Add Fresh Coolant
    Using the funnel, slowly fill the radiator up to the base of the filler neck with fresh coolant. Top off the overflow reservoir to the full mark.
  6. Bleed Air from System
    Start the bike and let it idle until the engine is warm. Cycle the throttle lightly to help remove trapped air. Turn off the engine, allow it to cool fully, then check and top off coolant in both the radiator and reservoir as needed. If the level drops after the first heat cycle, this is normal as air is purged from the system.
  7. Reassemble Panels
    Replace all removed bodywork, ensuring everything is secure.

KLX250S Model Tips & Notes

  • The 2013 KLX250S is built for varied terrain–keeping the cooling system healthy is vital, especially on hot trail rides or in slow, technical sections where airflow is limited.
  • This model has a relatively small coolant capacity, so leaks or low levels can quickly become critical. Always check for leaks after a coolant change, especially around the water pump and hose connections.
  • Never use hard tap water in the system; always opt for distilled to avoid mineral buildup. Stick to motorcycle-specific coolant to prevent chemical incompatibility with your KLX250S's seals and metals.
  • If you ride in extreme climates, consider a coolant brand designed for aggressive temperature swings or extra corrosion protection.
  • Check the owner's manual for the official coolant capacity, but plan to use just under a liter for a full drain and fill.

How Often Should You Change KLX250S Coolant?

  • Change the coolant every 2 years or 7,500 miles, whichever comes first. More frequent changes are a smart idea for harsh riding conditions or when contamination is suspected.

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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.