How to Change the Coolant in Your 2024 Kawasaki KLX140R F 21/18
Routine coolant changes are essential for maintaining the longevity and optimal performance of your 2024 Kawasaki KLX140R F 21/18. Use this proprietary step-by-step guide from MotoSport to keep your dirt bike's engine protected against overheating – especially important when tackling tough trails or track days. Owners of this model should note that the KLX140R F 21/18 is air-cooled, so a fresh, clean coolant system prevents scale, rust, and corrosion, ensuring reliable rides through every season.
What You Will Need
- Fresh, manufacturer-recommended engine coolant (avoid using plain water)
- 10mm socket – for drain bolt & shrouds
- 8mm socket – for side panels (if required)
- Phillips screwdriver
- Pliers (for hose clamps, if necessary)
- Drain pan
- Funnel
- Rags
- Filtered water (for flushing, if desired)
- Protective gloves
Step-by-Step Coolant Change Instructions
- Preparation:
- Let the engine cool completely – never open the radiator cap hot.
- Park the bike on a level surface & secure with a stand.
- Remove the seat and side panels to access the radiator area. For the KLX140R, remove side cover/seat as described in your manual for easy reservoir access. Some bolts on the tank cover may need to be loosened, especially on newer models with shrouds or tank protectors.
- Draining Old Coolant:
- Place a drain pan under the engine.
- Remove the radiator cap (slowly to release any built-up pressure).
- Locate the coolant drain bolt at the base of the water pump or lowest radiator point. Using the 10mm socket, remove the drain bolt and let the coolant flow into the pan.
- Tip – Loosen or remove the bleed screw (if equipped) to promote full flow and prevent air lock.
- Empty the Reservoir:
- If your bike features a separate coolant reservoir (overflow tank), remove the hose at the bottom and drain it fully (most KLX150R and similar models feature a tank accessible from the side panel).
- Flush the System (Optional):
- For thorough cleaning, fill the system with filtered water, re-install the drain bolt, and run the engine briefly (1–2 minutes). Let cool, then re-drain. Repeat until water runs clear.
- Reassembly & New Coolant Refill:
- Install the drain bolt (and tighten gently – do not overtighten).
- Use a funnel to slowly fill the radiator with new coolant, filling fully up to the neck.
- If your bike has a bleed screw, leave it open until coolant flows steadily without air, then close it.
- Fill the reservoir tank to the Full line with coolant if equipped.
- Air Removal (Burping):
- With the radiator cap still off, gently rock the bike side-to-side – this helps air escape. Top off coolant if the level drops.
- Start the engine and let it idle for 2–3 minutes with the cap off. Watch for bubbles – add more coolant as the level drops. When stable, install and tighten the cap.
- Check for Leaks & Finish:
- Reinstall all panels and the seat securely. Start the bike and check the coolant level periodically. Look for leaks around drain bolt, hoses, and the radiator cap. Top off the overflow tank after the first ride if necessary.
KLX140R F 21/18 Owner Tips
- This model's cooling system is compact – never mix different coolant types or use water alone, as mineral buildup damages small passages.
- Annual coolant changes are recommended regardless of mileage, due to air exposure and additive breakdown.
- Always torque bolts to specification to prevent stripped threads or leaks.
- If your ride regularly faces sandy, muddy, or high-heat conditions, inspect hoses for cracking and proper clamping at each service.
Keep your 2024 KLX140R F attacking every trail with confidence – and count on MotoSport for all your parts and maintenance essentials.
Related Shopping Categories
Shop Radiators for a 2024 Kawasaki KLX140R Dirt Bike.
Shop Coolant for a 2024 Kawasaki KLX140R Dirt Bike.
Shop Temperature Sensors for a 2024 Kawasaki KLX140R Dirt Bike.
Shop Tools for a 2024 Kawasaki KLX140R Dirt Bike.
Shop Radiator Hoses for a 2024 Kawasaki KLX140R Dirt Bike.
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.