How to Change the Coolant in a 2007 Kawasaki KLX110: Step-by-Step Guide

Shop parts for a 2007 Kawasaki KLX110 Dirt Bike.

Changing the coolant on your 2007 Kawasaki KLX110 is vital for maintaining consistent engine temperature, reliability, and peak performance. This guide from MotoSport is tailored specifically to the KLX110, with detailed steps and model-specific tips for a safe and thorough coolant swap.

What Youll Need

  • Fresh coolant (make sure it's compatible with aluminum engines)
  • Clean funnel and drain pan
  • Rachet set (for side cover removal, generally 8mm or 10mm socket)
  • Screwdriver (if needed for clamps or covers)
  • Distilled water (for system flush, if required)
  • Shop towels – for clean-up and any accidental spills
  • Protective gloves and eyewear

Before You Start: KLX110 Owner Notes

  • The KLX110 uses an air-cooled engine with a compact design. Most models rely on regular air and oil for cooling, but some aftermarket mods or niche models may use auxiliary cooling setups. Confirm if your KLX110 features a non-standard coolant system before proceeding.
  • If your bike is stock, stick to proper engine oil maintenance and make sure cooling fins are clean. For aftermarket liquid-cooled conversion kits (rare but possible), use the steps below.
  • Never attempt to open a cooling system when the engine is hot – let the engine cool fully to avoid burns.

Step 1: Preparation

  • Place the KLX110 on a stable, level surface and ensure the engine is cool.
  • Remove the right-side panel or any guards if they obstruct access to the radiator cap or coolant reservoir using a socket wrench.

Step 2: Draining the Coolant

  • Locate the coolant drain bolt; generally found at the lowest point of the water pump or radiator area, depending on setup.
  • Position your drain pan directly below the drain point.
  • Carefully loosen and remove the drain bolt. Let the old coolant completely drain into the pan.
  • If a radiator cap is present, remove it to allow quicker draining and prevent vacuum lock.

Step 3: Flushing the Cooling System (Recommended)

  • Insert the drain bolt and tighten gently.
  • Pour distilled water into the radiator or reservoir using a clean funnel.
  • Start the engine and let it idle for 1–2 minutes to circulate water and remove old coolant residue.
  • Shut off the engine, allow it to cool, then remove the drain bolt and drain the rinse water.

Step 4: Adding New Coolant

  • After draining, reinstall and tighten the drain bolt to the correct torque spec (check your owner manual or use gentle hand-tight only – overtightening may damage threads).
  • Using a funnel, slowly add fresh coolant to the radiator or reservoir up to the recommended fill line. Avoid overfilling.
  • If your KLX110 has a bleed screw (rare, but possible on custom kits), release any trapped air as directed by the manufacturer.

Step 5: Burping the System & Inspection

  • Replace the radiator cap or close the reservoir securely.
  • Start the engine, let it idle, and periodically squeeze radiator hoses (if accessible) to dislodge trapped air.
  • Monitor coolant level once the engine cools down, then top off if the level has dropped.
  • Wipe off any spilled coolant and inspect for leaks around the drain plug, hoses, and radiator cap.

Final Tips for KLX110 Owners

  • The stock 2007 KLX110 is air-cooled. Only follow this guide if your bike has a liquid-cooled kit or custom radiator installation. For standard models, focus on engine oil and keeping cooling fins clean for optimal air flow.
  • Dispose of old coolant responsibly; never pour it down drains or onto the ground.
  • Check coolant level periodically and replace coolant according to upgrade kit manufacturer recommendations.

Regular coolant maintenance ensures your KLX110 keeps running cool – whether stock or customized for high-performance rides.

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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.