How to Change the Coolant in a 2020 Kawasaki KLX140G

Shop parts for a 2020 Kawasaki KLX140G Dirt Bike.

Regular coolant changes are critical for the longevity and performance of your 2020 Kawasaki KLX140G. This model features a straightforward cooling system designed for reliability, but periodic fluid changes prevent overheating and internal corrosion – especially important if you ride in harsh conditions. Here's an exclusive MotoSport guide tailored just for your KLX140G.

Essential Tools & Supplies

  • Fresh coolant (silicate-free, designed for off-road motorcycles)
  • Drain pan
  • Funnel
  • 10 mm and 8 mm socket/ratchet
  • Distilled water for flushing
  • Clean rags
  • Safety gloves and eye protection

Step-by-Step Coolant Change Procedure

  1. Prep the Bike.
    • Make sure the engine is completely cool to avoid burns and pressure release injuries.
    • Park on level ground and use a stand for stability.
    • Remove the right-side panel with an 8 mm socket to access the overflow reservoir, if you want to fully clear old coolant.
  2. Remove Radiator Cap.
    • Gently twist off the radiator cap. This relieves any pressure and opens the system for draining.
  3. Drain the Old Coolant.
    • Place a drain pan under the water pump area.
    • Locate and remove the coolant drain bolt (10 mm) at the base of the right engine cover. Allow all coolant to drain.
    • To speed draining, gently tilt the bike side to side.
  4. Flush the System (Recommended).
    • Reinstall the drain bolt temporarily, pour distilled water into the radiator, and briefly reinstall the cap.
    • Start the bike for 30 seconds, turn off, remove the cap and drain bolt, and let the water flush out residual coolant.
    • Repeat if necessary until the fluid runs clear.
  5. Inspect and Reinstall Components.
    • Check the sealing washer on the drain bolt. Replace if damaged.
    • Reinstall and snug the drain bolt (do not overtighten).
  6. Refill with Fresh Coolant.
    • Slowly pour new coolant into the radiator. Allow time for the coolant to settle and air to escape (listen for gurgles). Fill to just below the filler neck.
    • Top off the overflow reservoir to the correct level as marked.
  7. Bleed Air from the System.
    • Start the engine with the cap off for 30 seconds. Watch for air bubbles escaping.
    • Let the engine cool, check the level, and top off if necessary.
    • Reinstall the radiator cap securely.
  8. Reassemble and Check.
    • Reinstall the side panel.
    • After your first ride, double-check both the radiator and reservoir coolant levels with the engine cool.

Special Notes for KLX140G Owners

  • The KLX140G cooling system contains a modest volume and is easy to drain fully, but always double-check for trapped air, especially if you notice the engine running warmer after service.
  • Use only premixed, silicate-free coolants compatible with aluminum radiators to prevent internal corrosion.
  • Inspect hoses and clamps each coolant change for wear, especially if you ride in mud or rocky areas.

Routine coolant maintenance not only supports longevity but also ensures consistent cooling performance on every ride. For all your KLX140G service parts, 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.