How to Change the Coolant in a 2010 Kawasaki KLX140R 17/14

Shop parts for a 2010 Kawasaki KLX140 Dirt Bike.

The 2010 Kawasaki KLX140R 17/14 is a reliable entry- to mid-level dirt bike with a liquid-cooled engine, designed for family fun and durability. Keeping its cooling system in top shape is essential to avoid overheating and maximize engine life. This guide details a proprietary step-by-step process tailored for KLX140R owners, with specific notes for your model.

What You Will Need

  • Coolant (pre-mixed motorcycle coolant or mix per coolant directions; do not use automotive coolant with silicates)
  • 10mm socket & ratchet
  • 8mm socket (for side panel removal)
  • Drain pan
  • Funnel
  • Distilled water (for optional flush)
  • Gloves & eye protection

Step 1: Prepare the Bike

  • Ensure the engine is cool before starting.
  • Put the bike securely on a stand for stability.

Step 2: Access the Radiator and Reservoir

  • Remove the side cover by taking out the 8mm bolts to access the overflow reservoir.
    You may also need to temporarily pull up the right side of the fuel tank cover using the bolts and screw to reach the radiator cap and hoses as needed.

Step 3: Drain the Old Coolant

  • Position the drain pan under the bike's water pump and hoses.
  • Remove the radiator cap to release any pressure.
  • Locate the coolant drain bolt or remove the lower radiator hose at the water pump (typically secured with a 10mm bolt or clamp). Allow all coolant to drain into the pan.
  • Don't forget to empty the overflow reservoir by disconnecting it as necessary and letting the fluid escape. (On this model, the reservoir is especially hidden, so removing the side panel is required.)

Step 4: Flush the System (Optional but Recommended)

  • Reinstall the drain bolt or hose securely.
  • Fill the system with distilled water, reinstall the cap, start the bike and let it run briefly (2-3 minutes).
  • Shut off the engine, let it cool, and drain the distilled water from both the radiator and reservoir.

Step 5: Add New Coolant

  • Once the system is fully drained, replace the drain bolt and secure the lower hose.
  • Using a funnel, slowly pour the new coolant directly into the radiator until it reaches the top. Fill the overflow reservoir to the appropriate mark.
  • Reinstall the radiator cap and side panels.

Step 6: Bleed the Cooling System

  • Start the engine with the radiator cap off for a minute, periodically blipping the throttle to help remove air. Carefully monitor the coolant level and top off if it drops.
  • When no more bubbles appear and coolant remains steady, turn off the engine. Secure the radiator cap fully.

Step 7: Final Checks

  • Check for any leaks at the drain, hose, and reservoir connections.
  • After your first ride, re-check the coolant level in both the radiator and reservoir, topping off as needed.

KLX140R Model Notes

  • The KLX140R's compact frame means that coolant access is tight; use patience with side panels and hose clamps.
  • This model is sensitive to air pockets after coolant service. Take extra care to fully bleed air to prevent overheating and ensure consistent performance.
  • Avoid using automotive coolant with silicates or phosphates, as these can damage the KLX140R's water pump seals and internal aluminum passages.

Routine coolant changes every one to two years help prevent corrosion and overheating, unlocking the best performance from your Kawasaki KLX140R 17/14. Keep riding confidently with proactive maintenance—and always be sure to dispose of old coolant properly and safely.

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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.