How to Change the Coolant in a 2010 Kawasaki KLX140R L 19/16

Shop parts for a 2010 Kawasaki KLX140L Dirt Bike.

Routine coolant changes keep your 2010 Kawasaki KLX140R L 19/16 running cool under pressurewhether you are out on the trail or pushing your limit at the track. This model features an air-cooled, four-stroke engine, but like most air-cooled dirt bikes, it does incorporate a coolant system for specific cooling purposes. The following step-by-step guide is uniquely tailored for your KLX140R L, ensuring you maintain optimal performance and avoid common pitfalls specific to this MMY dirt bike.

What You Will Need

  • Fresh coolant (choose a motorcycle-specific formula compatible with aluminum components and free of silicates)
  • Socket set (8mm, 10mm recommended)
  • Phillips screwdriver
  • Drain pan
  • Funnel
  • Clean rags
  • Filtered water for flushing (optional, but strongly recommended)
  • Gloves and eye protection

Step 1: Preparation – Cool Down the Bike

Park your KLX140R L on a stable surface, ensure it is completely cool, and stand it upright (use a center stand or bike lift for best results). A hot system is under pressure, so never remove any caps until the engine is completely cold.

Step 2: Accessing the Coolant System

  • Remove the right side panel to expose the coolant overflow reservoir. Use an 8mm or 10mm socket as appropriate for the bolts.
  • If needed, remove the seat and right tank shroud/number plate for better access to all components.

Step 3: Draining the Old Coolant

  • Place your drain pan under the water pump drain bolt (typically on the lower right side of the engine).
  • Slowly remove the radiator cap (if equipped) and open the drain bolt. Be careful, as old coolant can be toxic.
  • Allow all fluid to drain completely. Open the overflow reservoir cap and squeeze out any remaining liquid.

Step 4: Optional System Flush

For optimal maintenance, flush with filtered water:

  • Reinstall the drain bolt temporarily and fill the system with filtered water.
  • Start the engine for 1-2 minutes (do not let it get hot) to circulate water, then shut off and fully drain again.

Step 5: Adding New Coolant

  • Reinstall the drain bolt securely (do not over-tighten).
  • Use a funnel to fill the radiator and overflow reservoir to the specified level with fresh coolant. Look for any air pockets by gently rocking the bike and topping off if needed.
  • If your KLX140R L has a bleed screw, loosen it until coolant flows without bubbles, then retighten.

Step 6: Bleeding the System and Final Checks

  • Start the engine and let it idle with the radiator cap off. Add coolant if the level drops, watching for steady flow and no bubbling (air escaping).
  • When coolant level stabilizes, reinstall the radiator cap and ensure the overflow reservoir is between LOW and FULL marks.
  • Wipe up any spills and reinstall any covers or panels.

Critical Model-Specific Tips

  • The 2010 KLX140R L has a compact coolant routingalways inspect hoses for cracks or leaks during coolant changes.
  • Use only non-silicate, aluminum-safe coolant to avoid water pump seal wear and corrosion.
  • Check the overflow tank level regularly, especially after the first ride post-change.
  • Proper torque on bolts (especially the drain and radiator cap) prevents leaks and overtightening damage.

When to Change the Coolant

Change the coolant every two years, or sooner if you frequently ride in harsh conditions or notice contamination. This routine will protect your cooling system and maintain the KLX140R L's legendary reliability for years of fun on MotoSport trails and tracks.

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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.