How to Change the Coolant in a 2020 Kawasaki KLX140R 17/14: Step-by-Step Guide

Shop parts for a 2020 Kawasaki KLX140R Dirt Bike.

Maintaining proper coolant levels and replacing coolant at recommended intervals helps your Kawasaki KLX140R run efficiently, prevents overheating, and ensures longevity of internal components. This guide covers everything you need to know for this specific MMY KLX140R 17/14 model, including unique features and recommended practices.

What Makes the KLX140R Unique?

  • Air-cooled vs. Liquid-cooled: The 2020 KLX140R is a liquid-cooled dirt bike, unlike some KLX models that use air cooling.
  • Compact Design: The KLX140R 17/14 sits between youth and full-size bikes, so maintenance areas are designed for accessibility and tight layouts–expect snug workspaces.
  • Regular Service Benefits: Proper coolant change intervals (generally every 2 years or 24 months, or sooner under heavy use) are crucial due to relatively small coolant capacity and the stress of off-road riding.

Tools & Supplies Needed

  • 10mm socket or wrench
  • Phillips screwdriver
  • Drain pan
  • Funnel
  • Rags for cleanup
  • Engine Ice or Kawasaki-approved liquid coolant
  • Distilled water (for flushing, if required)

Step-by-Step Coolant Change Instructions

  1. Preparation
    • Start with the engine cool to avoid burns from hot coolant and system pressure.
    • Position dirt bike securely on a stand for level draining.
  2. Remove Side Covers
    • Use required tools to remove the side panels for access to the radiator and expansion tank.
    • The right-side panel typically must be removed; check for two or more bolts or fasteners.
  3. Remove Radiator Cap
    • Slowly unscrew the radiator cap to relieve any residual pressure; set cap aside.
    • Check cap seal for wear, replace if needed.
  4. Drain Old Coolant
    • Place a drain pan beneath the water pump on the right side of the engine.
    • Locate the coolant drain bolt (usually 10mm) on the lower side of the water pump housing.
    • Remove the drain bolt and let coolant flow into the pan.
    • If equipped, open the bleeder screw at the top of the radiator or system to speed draining and prevent air locks.
  5. Flush the System (Recommended)
    • Reinstall the drain bolt temporarily and fill the radiator with distilled water.
    • Re-open the drain bolt and drain. Repeat if residue remains.
  6. Refill with New Coolant
    • Reinstall and tighten the coolant drain bolt – do not overtighten and strip the threads.
    • Using a funnel, pour Kawasaki-approved coolant into the radiator up to the base of the neck.
    • Top off the reservoir/expansion tank between the LOW and FULL marks.
  7. Bleed the Cooling System
    • Loosen the bleeder (if equipped) to allow air escape while filling. Once coolant flows steadily, close the bleeder.
  8. Reinstall All Components
    • Reinstall the radiator cap securely.
    • Reattach all panels and covers.
  9. Run Engine & Final Check
    • Start the engine and let it idle to operating temperature.
    • Watch for leaks, and monitor the coolant level in the expansion tank after cycling the engine a few minutes.
    • Top off if necessary, never above the FULL line.

Expert Tips for KLX140R Owners

  • Always use premixed or properly diluted coolant–never pure antifreeze.
  • Avoid tap water; use distilled to prevent mineral buildup.
  • Tighten bolts to manufacturer torque specs.
  • Dispose of used coolant safely; it is toxic to pets and wildlife.
  • If you ride in muddy or dusty conditions, consider more frequent coolant checks.

Take pride in maintaining your KLX140R—proper care delivers more fun on the trails and extends your bike‘s life.

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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.