How to Change the Coolant in a 2020 Kawasaki KLX250
Shop parts for a 2020 Kawasaki KLX250 Dirt Bike.
Regular coolant maintenance is critical for keeping your 2020 Kawasaki KLX250 running efficiently, ensuring consistent engine temperature, and preventing overheating. The KLX250's liquid-cooled engine has a precise cooling system that requires routine checks and periodic coolant replacement. Here's a step-by-step proprietary MotoSport guide – tailored for KLX250 owners – to safely and completely change your engine coolant.
What You Need
- New 50/50 pre-mixed motorcycle coolant (ethylene glycol-based, silicate free)
- 10 mm socket/wrench and extension
- Drain pan
- Phillips screwdriver
- Funnel
- Shop rags
- Optional: distilled water for flushing
- Protective gloves & eyewear
Safety First
Never remove the radiator cap when the engine is warm or hot – this system is pressurized and you risk burns from hot coolant. Be sure your KLX250 is completely cool before service.
Step-by-Step: Replacing the Coolant
- Remove the seat and left side panel using your 10 mm socket. This provides easy access to the radiator cap and coolant overflow reservoir.
- Place a drain pan beneath the water pump area (right engine case bottom).
- Unscrew and remove the radiator cap slowly.
- Locate and remove the coolant drain bolt on the water pump (lower right side of engine). Carefully back out the bolt and allow the old coolant to drain completely.
- To empty the overflow tank (mounted behind the left panel under the seat), remove the cap and siphon or pour out the old coolant. Clean as needed.
- Optional: Flush the cooling system. Fill the radiator with distilled water, reinstall the cap and drain bolt, then run the engine briefly (30 seconds). Allow to cool, then drain again. Repeat until clear water drains out. This is useful if the coolant is heavily contaminated, but not always necessary for routine changes.
- Reinstall the drain bolt. Confirm the bolt and washer are in good condition, then torque snugly (do not overtighten).
- Pour new coolant into the radiator. Slowly add up to 33 ounces (975 ml) of 50/50 pre-mixed coolant directly into the radiator until full. Work any air bubbles out by gently squeezing the radiator hoses by hand.
- If you flushed the system: Start the engine and let it idle with the radiator cap off for up to 30 seconds. Be ready for the coolant level to drop as air purges from the cooling system. Top off as needed and turn off the engine.
- Add up to 5 ounces (150 ml) of coolant into the overflow reservoir up to the full mark, then secure the cap.
- Replace the radiator cap.
- Reinstall side panel and seat.
- Check for leaks around the drain bolt and hose connections. Run the engine and let it come up to temperature. After the first ride, re-check the coolant level and top up as needed.
Model-Specific Notes for the 2020 Kawasaki KLX250
- The KLX250 uses a high-flow dual radiator system; air pockets can hide in the system, so proper burping (idling with the cap off and gently rocking the bike) is important for a full fill.
- If the bike sees extended low-speed or off-road use, keeping coolant fresh is especially important for consistent engine temperature management.
- Never mix incompatible coolants (such as silicate-based car coolant or non-motorcycle fluids) – this KLX requires motorcycle-specific, pre-mixed coolant for optimal aluminum protection.
That's all it takes to keep your KLX250's cooling system performing at its best. Keep your scheduled maintenance and enjoy long, reliable rides.
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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.