How to Change Coolant on the 2015 Kawasaki KLX140R L 19/16: A Complete DIY Guide

Shop parts for a 2015 Kawasaki KLX140L Dirt Bike.

Regular coolant changes are a must for your 2015 Kawasaki KLX140R L 19/16 to keep it running cool and reliable, whether you're carving trails or hitting the track. The KLX140R L features a compact engine and radiator system that can be sensitive to air pockets and contamination, so extra care during this service pays off. Use these step-by-step instructions tailored specifically for this model:

What You'll Need

  • Fresh motorcycle coolant (avoid automotive coolants unless explicitly compatible)
  • Distilled water
  • Socket set (typically 8mm or 10mm)
  • Drain pan
  • Funnel
  • Clean rags
  • Gloves and eye protection

Step 1: Ensure Safety

  • Let the bike cool completely before starting–never open the radiator cap when hot.
  • Place the bike on a level stand and ensure it's secure.

Step 2: Access the Radiator and Drain Bolt

  • Remove the seat and left side panel using your socket set to easily reach the radiator and coolant reservoir.
  • Place a drain pan under the water pump drain bolt (typically near the lower right engine case).

Step 3: Drain the Old Coolant

  • Unscrew the radiator cap to allow air in, aiding the drain process.
  • Loosen and remove the coolant drain bolt and let the coolant fully drain into the pan.
  • It helps to also loosen the overflow hose at the bottom of the reservoir tank to fully empty the system.

Step 4: Flush the Cooling System (Recommended)

  • Refit the drain bolt, pour distilled water into the radiator, and temporarily reinstall the cap.
  • Start the engine briefly to circulate water, then shut off and cool completely.
  • Remove the drain boltdrain out the flush water. Repeat if the drained fluid still looks dirty.

Step 5: Refill with New Coolant

  • Reinstall and torque the drain bolt (avoid overtightening–refer to your owner's manual for specs).
  • Slowly pour pre-mixed motorcycle coolant into the radiator up to the filler neck, letting bubbles escape.
  • Fill the overflow reservoir to the "Full" mark.

Step 6: Bleed Air from the System

  • With the radiator cap off, start the engine and let it idle for several minutes. Gently rock the bike or squeeze radiator hoses to release trapped air.
  • Shut the engine off and top off the radiator if needed. Repeat once if large bubbles escape.
  • Once level remains steady, reinstall and secure the radiator cap.

Step 7: Clean Up & Final Checks

  • Wipe up any spilled coolant–it's toxic to pets and harmful to the environment.
  • Check for leaks around the drain bolt, hoses, and radiator cap.
  • Replace the side panel and seat.

Tips & Notes for the KLX140R L Owner

  • The KLX140R L is lightweight but has a relatively small coolant capacity, so never overfill the radiator or reservoir.
  • Use only high-quality, silicate-free motorcycle coolant to avoid clogging the narrow radiator passages.
  • If you ride in muddy or dusty conditions, check the radiator fins and clean them gently with compressed air or a soft brush to ensure good airflow.
  • Check coolant level after your next ride–some air bubbles may work out during your first run post-change.

Regular coolant changes will keep your Kawasaki KLX140R L running at the right temperature and prevent overheating. If you ever notice rapid coolant loss, unexpected overheating, or leaks, inspect and replace worn hoses, radiator caps, or gaskets as soon as possible.

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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.