How to Change the Coolant in a 2017 Kawasaki KLX140G

Shop parts for a 2017 Kawasaki KLX140G Dirt Bike.

Keeping your 2017 Kawasaki KLX140G running cool under all riding conditions means routine coolant changes are essential. The KLX140G, thanks to its large-wheeled chassis and robust air-cooled engine, is a favorite for new and returning riders alike. While it relies primarily on air cooling, the bike still uses coolant within its closed system to regulate engine temperatures and protect internal components—especially on extended trail rides or during slow technical sections. Here–s a model-focused guide to changing the coolant and some owner tips you won–t want to miss.

What You–ll Need

  • Gloves and safety glasses
  • A drain pan or suitable container
  • 10mm and 8mm sockets/ratchet
  • Phillips screwdriver (for bodywork and reservoir access)
  • Fresh pre-mixed motorcycle coolant (avoid silicate-based antifreeze—it can damage the KLX system)
  • Distilled water if flushing system
  • Funnel (narrow tip for filler neck)
  • Replacement sealing washer for the drain bolt (recommended for best seal)
  • Rags for spills and cleanup

Step-by-Step Coolant Change Process

  1. Let the engine cool completely. Never open a hot cooling system as escaping steam or hot coolant can cause severe burns.
  2. Remove the side panels.
    Use the appropriate sockets to remove both side panels. This gives you access to the coolant reservoir bottle and the radiator (located in the front right of the frame).
  3. Remove the radiator cap.
    Place a rag around the filler neck. Press down and turn to remove the cap slowly to safely release any residual pressure.
  4. Drain the system.
    Locate the coolant drain bolt on the lower edge of the water pump cover (left side of the engine). Position your drain pan underneath.
    Remove the bolt and let the old coolant flow out completely. Open the reservoir bottle cap during this step—this helps fluid drain faster.
  5. Flush the system (optional but recommended).
    If coolant appears dirty or overdue for service, fill the radiator with distilled water, reinstall the drain bolt, and run the engine briefly (just a minute or two) with the cap on. Then repeat the draining process. This helps remove leftover deposits and debris.
  6. Install the drain bolt (with a new sealing washer if available), and torque it snugly. Do not overtighten.
  7. Refill the radiator.
    Using the funnel, pour the fresh coolant slowly into the radiator filler neck until it reaches the very top. For this bike, never use regular tap water—distilled only—to avoid mineral buildup.
  8. Fill the coolant reservoir to the upper level mark.
    If the KLX140G–s reservoir has two lines, fill to the "Full" or upper line.
  9. Remove trapped air ("burp" the cooling system):
    Leave the radiator cap off and start the engine. Let it idle for a minute while squeezing the lower radiator hose occasionally, which helps bubbles escape. Watch the coolant level—as air escapes, it may drop. Add more coolant as needed until it stays at the neck.
  10. Replace the radiator cap and recheck the reservoir.
    Once the radiator is full, reinstall the cap. With the engine off and cool, check and top off the reservoir to the correct level.
  11. Reinstall all bodywork.

Kawasaki KLX140G Owner Tips & Model Notes

  • The KLX140G features an uncomplicated cooling system without a thermostat; this makes removing air bubbles easier but requires careful level checking after the first ride.
  • After your first post-change ride and the bike is cool, recheck both radiator and reservoir levels. Add coolant if low.
  • Dispose of old coolant responsibly—never pour it down a drain, as it is toxic to people, pets, and the environment.
  • Silicate-free, motorcycle-specific coolant is highly recommended for the KLX140G to prevent internal wear and maximize longevity.
  • If you notice persistent loss of coolant or signs of overheating, inspect hoses, the water pump seal, and radiator for leaks.
  • When removing the side panels, be gentle with the plastic tabs—they can crack if forced.

Final Thoughts

Changing the coolant in your 2017 Kawasaki KLX140G is a straightforward but critical part of regular maintenance. With the steps above and just a few simple tools, you–ll keep your Kawasaki running cool wherever your trail adventures take you.

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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.