How to Change the Coolant in a 2013 Kawasaki KX250F: Step-by-Step Guide

Shop parts for a 2013 Kawasaki KX250F Dirt Bike.

Changing the coolant in your 2013 Kawasaki KX250F is a fundamental maintenance task – it keeps your bike running at optimal temperatures and protects the engine against overheating. Here is a detailed guide specifically for the 2013 KX250F, along with unique tips every owner should know.

What You Need

  • Permanent-type green antifreeze
  • Soft (distilled) water – mix to a 50/50 ratio with antifreeze
  • Drain pan
  • Socket set (8mm socket for drain bolt)
  • Rags for cleanup
  • Funnel (optional, helps pouring with less mess)
  • Protective gloves and eye protection

Preparation

  • Allow the engine to cool completely. Never attempt to change coolant with a hot engine – hot coolant can cause severe burns.
  • Place the bike on a stand, ensuring it is stable and upright.

Draining the Coolant

  1. Locate the radiator cap (on top of the left radiator). Remove it slowly – if the engine ran recently, open it gradually to release any residual pressure.
  2. On the right side of the engine, find the coolant drain bolt. This is located on the water pump cover and typically uses an 8mm socket. Position your drain pan underneath.
  3. Remove the drain bolt and allow all old coolant to drain into the pan.
  4. To ensure complete drainage, you may gently tip the bike from side to side.
  5. Inspect the drain bolt and its washer, then reinstall and torque to specification (typically 7 N-m or 62 in-lb).

Flushing (Optional but Recommended)

  • If the old coolant appears dirty or contains debris, flush the system with distilled water. Fill, run the engine briefly with the radiator cap off, allow cooling, and then fully drain. Repeat until clear water runs out.

Refilling the Coolant

  1. Mix a solution of 50 percent permanent-type antifreeze (green) with 50 percent soft or distilled water. The 2013 KX250F cooling system holds 1.10 liters (1.16 US qt).
  2. Slowly add coolant through the radiator filler neck until the level reaches the base of the neck.
  3. Rock the bike gently or squeeze the radiator hoses to help remove trapped air bubbles.
  4. Top off if necessary, then reinstall the radiator cap securely.

Bikes-Specific Notes for the 2013 KX250F

  • This model requires a non-silicate, non-phosphate green coolant. Avoid any coolant containing silicates, which can wear out the water pump seals prematurely.
  • The 2013 KX250F uses a liquid-cooled, 4-stroke, single-cylinder DOHC engine with a high compression ratio. Maintaining optimal coolant level and type is critical to prevent overheating, especially in high-rpm or aggressive riding conditions.
  • The total coolant capacity is approximately 1.10 liters – overfilling or underfilling can lead to cooling system inefficiency.
  • Always check for leaks at the drain bolt and radiator cap after the first ride. If coolant level drops noticeably, investigate for trapped air or leaks.
  • Wipe up any spilled coolant immediately – it is slippery and toxic to the environment and pets.

Final Steps

  • Start the engine and let it idle for a few minutes with the radiator cap on. Then shut it down and let it cool completely. Recheck the coolant level – top off if necessary.
  • Inspect the area for signs of leaks and ensure the rad cap is tightly secured.

Regular coolant changes extend the life of your 2013 KX250F’s cooling system and help maintain peak performance on every 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.