How to Change the Coolant in a 2020 Kawasaki KLX140R L 19/16
Shop parts for a 2020 Kawasaki KLX140R L Dirt Bike.
Changing the coolant on your 2020 Kawasaki KLX140R L ensures the engine maintains optimal temperature, prevents overheating, and extends the lifespan of critical components. Follow this in-depth, MotoSport-exclusive guide tailored specifically for your bike model–including best practices and insider tips unique to the KLX140R L 19/16.
Why Coolant Changes Matter for Your KLX140R L
- Prevent overheating: Fresh coolant maintains the right engine temperature, which is crucial for performance and reliability.
- Protect aluminum components: The KLX140R L's engine uses aluminum parts that require modern, silicate-free coolant for corrosion prevention.
- Consistency for trail and track: Regular coolant changes keep your bike running smoothly regardless of conditions–whether on trails or tracks.
What You'll Need
- Fresh, motorcycle-safe coolant (pre-mixed or mix with distilled water as directed)
- 10mm socket and ratchet
- Phillips screwdriver (for any panel removal or radiator bleeder screws)
- Funnel
- Drain pan
- Shop rags or paper towels
- Protective gloves and eyewear
Step-by-Step Coolant Change Instructions
-
Ensure the bike is cool and safely positioned:
Place the KLX140R L on a stand or firm surface. Never try this service with a hot engine–let it cool completely. -
Remove the radiator cap:
Loosen and carefully remove the radiator cap (located at the top-left of the radiator) to relieve any system pressure. -
Locate and remove the coolant drain bolt:
Find the drain bolt at the water pump on the lower right side of the engine case. Place your drain pan beneath, then use a 10mm socket to remove the bolt and allow old coolant to fully drain. -
Flush the system (optional but recommended):
If your coolant is dirty or the bike's service history is unknown, pour distilled water into the radiator, reinstall the drain bolt, start the engine briefly, then let it cool and drain again. Repeat as needed. -
Inspect hoses and components:
While the system is empty, check radiator hoses and clamps for wear or leaks–replace as needed for optimal safety and longevity. -
Add new coolant:
Reinstall the drain bolt securely. Insert a funnel into the radiator filler neck, then slowly pour in coolant until it reaches the base of the neck. Squeeze radiator hoses gently to help dislodge any trapped air bubbles. -
Bleed and test the system:
Leave the radiator cap off and start the bike for one to two minutes. Rev gently a few times to help remove air pockets. Shut off the engine, top off coolant again if needed, then reinstall the radiator cap. -
Check and fill overflow reservoir (if equipped):
Locate the coolant expansion (overflow) reservoir, usually along the left side under the panel. Fill to the full marker line. -
Final inspection:
Check for any leaks, clean up spills, and ensure all fasteners and panels are secure.
Special Considerations for the KLX140R L
- This model is fanless–extra care is needed to avoid overheating during slow technical riding. Do not idle excessively after refilling coolant.
- Use only high-quality, silicate-free motorcycle coolant for aluminum engines to prevent internal corrosion.
- Ride the bike for a few minutes, then allow it to cool and re-check coolant levels. Repeat topping up as necessary due to coolant expansion and air purging.
- The 19/16 wheel version (KLX140R L) shares the same engine and cooling components as the standard KLX140R, so process and coolant capacity are identical.
When to Change Coolant
- Replace coolant every 2 years, or 8,000 miles–whichever comes first.
- Inspect coolant condition after muddy rides, deep water crossings, or long-term storage. Any cloudiness or debris means a replacement is due.
Disposal
- Dispose of old coolant as hazardous waste at your local recycling center. Never pour down domestic drains or onto the ground.
Stay ahead on maintenance and keep your 2020 Kawasaki KLX140R L running cool and reliable by making coolant changes part of your regular care routine.
Related Shopping Categories
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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.