How to Change the Coolant in a 2005 Kawasaki KLX110

Shop parts for a 2005 Kawasaki KLX110 Dirt Bike.

Routine coolant changes are essential for maintaining your 2005 Kawasaki KLX110's performance, especially if you regularly ride trails or push your dirt bike in hot conditions. While the KLX110 is an air-cooled model and doesn't feature a standard liquid coolant system like larger motocross bikes, some custom builds and certain KLX110 variations may use aftermarket or upgraded cooling systems. If your KLX110 is modified with a radiator or liquid-cooling setup, use the following proprietary MotoSport guide. For standard air-cooled models, simply ensure engine fins and overall airflow are clean and clear.

For KLX110s equipped with a coolant system, here is a complete, proprietary step-by-step:

  • Gather essential tools – ratchet set with 8mm/10mm sockets, a drain pan, a funnel, clean rags, recommended coolant (consult your owner's manual or stick with a universal motorcycle coolant), and gloves for protection.
  • Cool the engine completely – Never open the system with a hot engine. Burns from hot coolant can occur quickly.
  • Access the drain bolt – Remove any necessary side panels using an 8mm socket to expose the coolant drain bolt (often located at the base of the water pump or radiator if equipped). Place the drain pan underneath.
  • Open the radiator cap or reservoir – This allows coolant to flow freely as you drain the old fluid. Unscrew the cap and set it aside.
  • Remove the drain bolt – Carefully loosen the drain bolt. Allow all coolant to flow into your drain pan. Inspect the old coolant for signs of rust, debris, or oily residue — these can indicate engine issues.
  • Flush the system (optional but recommended) – Replace the drain bolt and pour distilled water into the radiator. Start the engine and let it idle for a minute, then shut off and drain again. Repeat until water runs clear.
  • Add new coolant – Reinstall the drain bolt securely. Fill the radiator or reservoir with new coolant until it reaches the recommended level. Use a funnel to prevent spills.
  • Bleed the system – Some cooling systems have a bleeder screw (consult your specific equipment). Open it slightly during filling to let trapped air escape, then close when coolant flows steadily out.
  • Run & recheck – Start the bike and let it idle a few minutes, periodically squeezing hoses (if accessible) to help remove air. Shut the engine off, let it cool, and top off coolant if needed.
  • Final check – Inspect for leaks around the drain bolt and hoses. Wipe up any spills and reinstall side panels.

Model-specific note: The KLX110's air-cooled design requires no routine coolant changes in its stock configuration. Liquid cooling is only necessary for modified bikes – if yours is stock, prioritize engine fin cleanliness and regular oil changes instead.

Always dispose of old coolant responsibly, as it is toxic to animals and the environment. For all your 2005 Kawasaki KLX110 maintenance and parts needs, MotoSport has you covered.

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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.