How to Change the Coolant in a 2016 Kawasaki KX65

Shop parts for a 2016 Kawasaki KX65 Dirt Bike.

Regularly changing the coolant in your 2016 Kawasaki KX65 is essential for keeping the engine running cool and reliable, especially during intense motos and warm weather rides. Here is a proprietary, detailed MotoSport guide for draining, flushing, and refilling the cooling system on your KX65.

What You Will Need

  • Appropriate coolant (engineered for dirt bikes; check owner’s manual for specifications)
  • Clean container for used coolant
  • 10mm socket or wrench
  • Large Phillips screwdriver
  • Rags for cleanup
  • Fresh water (for optional flushing)
  • Compressed air (if switching coolant types or extra thoroughness is desired)

Step 1 – Prep Your Bike

  • Let the engine cool before starting to avoid burns from hot coolant or the system.
  • Place the bike upright on a level surface using a stand for best access and drainage.

Step 2 – Remove Radiator Cap and Bleeder

  • Locate the radiator cap on the left side of the bike. Slowly twist off the cap to release pressure.
  • If your model has a bleeder screw on the opposite radiator, remove it with a large Phillips screwdriver. This helps prevent vacuum lock and allows coolant to drain smoothly.

Step 3 – Drain the Old Coolant

  • Find the coolant drain bolt on the water pump cover, typically at the lowest point. Use a 10mm socket to remove it and aim the flow into your container. (On KX65, the water pump cover is visible on the right side of the engine.)
  • Allow the system to drain fully. Squeeze the radiator hoses gently to help remove trapped coolant.

Step 4 – Flush the System (Optional)

  • If changing coolant types or for optimal maintenance, flush the system with distilled water: replace the drain bolt, fill with water, run the bike briefly (1–2 minutes at idle), turn off, let cool, then repeat steps 2 and 3 until clear water comes out.
  • For a complete purge, you may disconnect the lower hose and use compressed air (with a rubber tip) to blow out residual fluid—take care not to damage sealing surfaces.

Step 5 – Reinstall Drain Bolt

  • Clean and inspect the drain bolt and sealing washer. Reinstall and tighten securely; do not overtighten. (Typical torque for similar models is 7.0 N-m or 62 in-lb.)

Step 6 – Add New Coolant

  • Fill the radiator slowly with the recommended type and mix until it reaches the fill neck. Squeeze hoses to help remove air pockets.
  • If removed, reinstall the bleeder screw after coolant flows from the bleeder, indicating a full system.

Step 7 – Bleed & Check

  • With the cap still off, lean the bike side to side, then gently 'burp' the system by slowly kicking the bike over to circulate coolant.
  • Top off as necessary. Replace and lock the radiator cap—ensure it clicks securely for a tight seal.

Step 8 – Final Steps

  • Clean any spills to prevent corrosion.
  • Start the bike, let it warm up completely, then re-check coolant level after cooling. Add more if needed.
  • Dispose of old coolant responsibly. 

KX65-Specific Notes

  • The KX65 shares its cooling architecture with past years, but always check hose routing and clamp positions as per service manual diagrams to avoid pinching or misrouting cables and wires.
  • This model has a small capacity; avoid overfilling and always run the recommended coolant mix for top performance and water pump protection.
  • Keep an eye on the radiator cap for damage or loss of sealing–a compromised cap can lead to pressure loss and overheating.
  • Regular coolant changes every season or after heavy use will help protect the cylinder, cylinder head, and water pump from deposits and corrosion.

Proper coolant maintenance ensures your KX65 keeps running at peak performance, lap after lap. 

Related Shopping Categories

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Shop Radiator Hoses for a 2016 Kawasaki KX65 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.