How to Change the Coolant in a 2018 Kawasaki KLX140R 17/14: Step-by-Step Guide

Shop parts for a 2018 Kawasaki KLX140 Dirt Bike.

Routine coolant changes are essential to keep your Kawasaki KLX140R 17/14 running cool and reliably through every ride. This model features a simple, air-cooled engine design, yet like all KLX140 variants with liquid-cooling systems, the proper maintenance of the coolant prevents overheating, corrosion, and premature wear of engine internals. Here's a proprietary MotoSport guide designed exclusively for 2018 KLX140R ownerscovering the process, tools, and model-specific insights.

What You Need

  • New coolant compatible with aluminum motorcycle radiators (silicate-free, pre-mixed or concentrated to mix with distilled water if required)
  • 10 mm and 8 mm sockets with ratchet
  • Phillips screwdriver
  • Drain pan
  • Funnel
  • Shop towels/rags
  • Distilled water (if flushing system)
  • Protective gloves and eyewear

Step 1: Prepare the Bike

  • Allow the engine to cool fully before starting. Hot coolant is dangerous under pressurenever open the radiator cap on a warm engine.
  • Place the bike on a stable stand and remove the side panels using an 8 mm socket or Phillips screwdriver if needed for better radiator reservoir access.

Step 2: Draining the Coolant

  • Locate the radiator cap and slowly loosen to release any residual pressure before removal.
  • Find the coolant drain boltthis is typically on the lower right side at the water pump. Place your drain pan beneath it.
  • Remove the drain bolt with a 10 mm socket, allowing old coolant to fully drain. Remember to open the radiator cap completely to speed up draining.
  • Check for an overflow reservoir tank (KLX140R models usually have one behind the right side panel). If present, disconnect the lower hose or unbolt the tank and pour out any old coolant.

Step 3: Flushing the System (Optional but Recommended)

  • Reinstall the drain bolt temporarily. Fill the radiator and reservoir tank with distilled water. Reinstall the radiator cap.
  • Start the engine and let it idle for 1–2 minutes, then shut off and allow the engine to cool.
  • Repeat the draining process to flush out debris or old coolant residue.
  • Remove the drain bolt again and let the system empty completely before proceeding.

Step 4: Refilling with New Coolant

  • Reinstall and torque the drain bolt to factory specs (don't overtighten).
  • With the radiator cap removed, use a funnel to carefully pour new coolant in until the level reaches just below the neck. Fill the reservoir to the indicated "Full" line.
  • Let the bike stand upright and gently squeeze the radiator hoses several times to dislodge any trapped air bubbles in the system.
  • Top off if the level drops after burping the system.
  • Install the radiator cap securely.

Step 5: Bleeding the System

  • Start the engine and let it idle until fully warm. Watch the coolant leveloccasionally bubbles may escape into the overflow tank, causing a drop in the radiator level.
  • Shut off the engine and allow the bike to cool. Recheck the radiator and overflow levelstop off as needed.

Step 6: Clean Up & Final Checks

  • Wipe up any spilled coolant to protect sensors and hoses as well as painted surfaces.
  • Reinstall all bodywork removed during prep.
  • Run the engine, monitor for leaks, and confirm coolant is circulating properly.

Model-Specific Notes for the 2018 KLX140R 17/14

  • Factory coolant type: Always use aluminum-safe, high-quality motorcycle coolant as this bike's radiator and components are susceptible to corrosion from improper mixtures.
  • Radiator cap pressure: Stick with the OE pressure ratingaftermarket caps with inappropriate ratings can risk system damage or poor cooling.
  • Air pockets: Thanks to the compact radiator height, trapped air is common. Gently rocking the bike side-to-side and squeezing hoses will help bleed the system thoroughly.
  • Coolant change interval: Recommended every two years under normal use, or more often for bikes frequently used in mud or race environments.
  • Disposal warning: Used coolant is toxic. Always collect and dispose of it following local regulations—keep coolant away from pets and children.

With these simple steps and MotoSport-exclusive tips, your KLX140R will be ready for many more hours of smooth, trouble-free riding. Staying on top of coolant changes is the key to maximizing performance and longevity of your Kawasaki's engine.

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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.