How to Change the Coolant in a 2019 Kawasaki KLX140G: Step-By-Step Guide
Shop parts for a 2019 Kawasaki KLX140G Dirt Bike.
Keeping the coolant fresh in your 2019 Kawasaki KLX140G is essential for maintaining optimal engine temperature, preventing corrosion, and ensuring reliable performance on every ride. This detailed guide, made just for MotoSport.com riders, covers every key step and highlights unique features of the KLX140G model every owner should know.
Why Regular Coolant Change is Crucial
- Prevents overheating: Old coolant loses efficiency, risking engine damage.
- Stops corrosion: Fresh coolant contains inhibitors that protect engine components.
- Ensures peak performance: Consistent temperatures help your KLX140G run its best.
What Makes the 2019 KLX140G Coolant System Unique?
- Lightweight radiator: The KLX140G's compact radiator is positioned for maximum airflow, so debris and mud can build upclean it while changing coolant.
- No radiator fan: This air-cooled design means coolant health is even more critical in slow, technical riding where airflow drops.
- Plastic panels: Panels must be removed for reservoir and radiator access–keep track of mounting bolts and avoid overtightening during reassembly.
What You Will Need
- New coolant rated for off-road motorcycles (avoid automotive coolants)
- Filtered water (for optional flushing)
- 10mm and 8mm sockets with ratchet
- Drain pan
- Funnel
- Shop rags
- Protective gloves
Step-By-Step Coolant Change for KLX140G
- Let the engine cool completely. Never open the radiator cap on a hot bike–wait until the system is fully cooled to prevent burns.
- Remove both shrouds/panels. Use an 8mm socket to remove the side panel (right side) and shroud bolts to expose the radiator and overflow reservoir. Set fasteners aside safely.
- Place a drain pan under the water pump drain bolt. This is typically on the lower right side of the engine. Use a 10mm socket to carefully loosen this bolt.
- Open the radiator cap. Twist off slowly, allowing air to enter and coolant to drain smoothly.
- Drain the coolant completely. Let fluid flow until no more drips appear. Check hoses for blockages.
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Flush the system (optional, but recommended if coolant is very dirty):
- Use clean, filtered water poured via the radiator cap to flush remaining debris. Reinstall the drain bolt, fill with water, run the engine for a few minutes, shut down, and repeat draining. Do not use tap water, which may cause mineral buildup.
- Reinstall the drain bolt. Ensure the crush washer is intact. Tighten securely, but do not overtighten to avoid stripping threads.
- Refill coolant. Pour new coolant slowly into the radiator until nearly full. The KLX140G holds approximately 1 quart. Move hoses by hand to release trapped air. Top off to the fill neck.
- Start the engine with the radiator cap off (if safe, and outdoors): Run for about two minutes. Watch for air bubbles escaping and the coolant level dropping. Top off as needed.
- Check overflow reservoir level. Add coolant to the reservoir to the FULL mark.
- Replace the radiator cap and reinstall panels. Double-check all fasteners are snug and panels fit securely.
- Dispose of old coolant responsibly. Take used coolant to an approved recycling facility–never pour down the drain.
After Care and Pro Tips
- Check for leaks: Run the bike and inspect around the drain bolt, hoses, and radiator cap for any wetness.
- Monitor coolant level after your first ride: Trapped air may burp out, causing the level to drop slightly. Top off reservoir if needed.
- Inspect radiator fins: Use compressed air or gentle water pressure to clear mud and dirt, improving cooling efficiency.
Changing the coolant regularly is one of the simplest and most effective ways to protect your KLX140G engine, especially given its lightweight cooling system. For best results, inspect hoses and clamps during service–replace any showing age or wear for reliable performance through every trail and jump.
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.