How to Change the Coolant in a 2017 Kawasaki KLX140R L 19/16

Shop parts for a 2017 Kawasaki KLX140R L Dirt Bike.

Maintaining the cooling system on your 2017 Kawasaki KLX140R L is critical for optimum performance and engine life–especially since trail riding and off-road use can stress the cooling system more than street use. This guide from MotoSport will take you step-by-step through changing the coolant on your KLX140R L 19/16 while highlighting model-specific tips every owner should know.

What Makes the KLX140R L 19/16 Cooling System Unique?

The KLX140R L is equipped with a compact, efficient liquid-cooling system designed for reliability and easy access for maintenance. Its radiator sits high to avoid trail debris, and the overall design favors easy serviceability. Because this model often runs at high revs with young or new riders, regularly checking and replacing the coolant is extra important to prevent overheating.

Tools & Supplies Needed

  • Fresh, high-quality silicate-free motorcycle coolant (pre-mixed recommended)
  • 10mm socket and ratchet
  • Phillips screwdriver
  • Drain pan
  • Funnel (for easy refilling)
  • Clean water (distilled preferred, for flushing)
  • Gloves and rags for safety and cleanup

Step-By-Step Coolant Replacement Procedure

  1. Let the engine cool completely. Never attempt to change coolant when the engine is hot to avoid burns from hot coolant or steam.
  2. Remove the seat and side panel. Use a 10mm socket or Phillips screwdriver to remove the fasteners. This exposes the radiator cap and, if equipped, the coolant overflow reservoir. Set panels aside carefully.
  3. Open the radiator cap. Turn the radiator cap slowly to the first stop to release any residual pressure, then remove completely.
  4. Locate and remove the drain bolt. Position a pan beneath the water pump area or designated drain bolt. Using a 10mm socket, carefully remove the drain bolt and allow old coolant to fully drain out.
  5. Flush the cooling system (recommended every other change). With the drain bolt out, pour clean distilled water into the radiator. Replace the cap, briefly start the engine (less than one minute), allow it to circulate, then turn off and drain again to flush out any remaining contaminants.
  6. Replace the drain bolt and tighten gently. Inspect the sealing washer and replace if worn. Tighten the bolt snugly but do not overtighten.
  7. Pour in new coolant. Use a funnel for accuracy. Fill the radiator up to the filler neck with the correct amount and type of coolant. For most conditions, use a silicate-free, pre-mixed motorcycle coolant. Avoid automotive coolants that may harm seals or aluminum parts.
  8. Bleed air from the system. Gently rock the bike side-to-side to help air escape. Squeeze radiator hoses to assist in releasing trapped air. Top off coolant as needed.
  9. Inspect and reassemble. Check for leaks at the drain bolt and hose connections. Replace the radiator cap, reinstall side panels and seat.
  10. Run the engine and recheck. Start the bike and let it idle until it reaches normal operating temperature. Watch for leaks and keep an eye on the coolant level after the first ride as any hidden air bubbles may work their way out. Top up as necessary.

Model-Specific Notes for the KLX140R L Owner

  • Coolant Capacity: The KLX140R L has a relatively small radiator, so only a modest amount of coolant is needed. Take care not to overfill.
  • Engine Protection: Regular coolant changes are especially important for these small-bore, air-tight engines. Severe overheating can warp the cylinder head or damage gaskets.
  • Yearly Checks: Even if riding is infrequent, change coolant at least every two years due to chemical breakdown over time.
  • Coolant Type: Always use a coolant meeting Kawasaki or Japanese motorcycle specifications–avoid car coolant unless labeled safe for aluminum engines and radiators.
  • Disposal: Never pour old coolant down the drain. Take used coolant to a motorcycle dealer or recycling center that handles hazardous automotive fluids.

By following these steps and watching for leaks or low coolant levels, you'll keep your 2017 KLX140R L running safely and reliably for years on the trail.

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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.