How to Change the Coolant in a 2019 Kawasaki KLX140R L 19/16
Shop parts for a 2019 Kawasaki KLX140L Dirt Bike.
Routine coolant changes are crucial for keeping your 2019 Kawasaki KLX140R L 19/16 running cool and performing at its best. This model's compact air and liquid-cooled engine is notably reliable for recreational trail riding, but proper maintenance ensures it remains trouble-free. Use only high-quality, motorcycle-specific coolant–never automotive coolant–to match the unique aluminum components found in Kawasaki's cooling system.
What You’ll Need
- Phillips screwdriver and a 10mm socket/ratchet
- Clean catch pan
- Funnel
- Distilled water for flushing
- Recommended motorcycle coolant (silicate-free, ready-to-use or mix as directed)
- Gloves and safety glasses
- Shop towels
Step-by-Step Coolant Change Guide
- Ensure the engine is completely cool. Hot coolant can cause severe burns.
- Remove the seat and side covers to access the radiator and overflow reservoir. On the KLX140R L, use an 8mm or 10mm socket for the side cover fasteners. Set aside the panels carefully.
- Locate the radiator cap and overflow reservoir. Open the radiator cap slowly to relieve any residual pressure.
- Position your drain pan. Locate the coolant drain bolt–typically on the lower right side of the engine, near the water pump. Remove the bolt with your socket to drain old coolant fully. Also, remove or disconnect the lower hose if additional draining is needed.
- Empty the overflow reservoir. Disconnect the small hose from the reservoir and tip it to drain any remaining coolant.
- Flush the system: Reinstall the drain bolt. Pour distilled water into the radiator until full, then run the engine briefly (with the radiator cap off) so the water circulates. Shut off the engine, drain again, and repeat until the drained water is clear. This step helps remove any old coolant or debris.
- Reinstall the drain bolt (with a fresh washer if available) and torque it to the manufacturer’s spec. On the KLX140 lineup, be meticulous with drain bolt torque–overtightening can strip the threads in the aluminum case.
- Pour in new coolant slowly with a funnel, filling to the lip of the radiator neck. Squeeze hoses gently to release trapped air.
- Top off the overflow reservoir to its marked full line with fresh coolant.
- Bleed the system: With the cap still off, start the engine for a minute or two to circulate the new coolant and purge air. Shut off and let it settle; top off the radiator as needed.
- Secure the radiator cap (make sure it’s on tightly). Double check that there are no leaks from the drain bolt or hoses.
- Reinstall the side covers and seat.
- Rinse away any spilled coolant with water, as even a small amount left on aluminum surfaces can cause corrosion over time.
Details Specific to the 2019 KLX140R L 19/16
- Reservoir position: The overflow bottle is tucked under the left side cover–be careful during removal and reinstallation, as the plastic is easily damaged.
- Coolant capacity: Confirm your manual for the exact fill, as overfilling can cause boil-over, and underfilling risks overheating.
- Routine checks: Inspect hoses and clamps each time you service the system. These are commonly overlooked on smaller trail bikes but age with exposure to mud and vibration.
With proper coolant maintenance, your KLX140R L’s engine will stay cooler, last longer, and deliver the consistent performance you expect on or off 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.