How to Change the Coolant in a 2019 Kawasaki KX250
Shop parts for a 2019 Kawasaki KX250 Dirt Bike.
Performing regular coolant changes on your 2019 Kawasaki KX250 ensures optimal engine performance, prevents overheating, and extends the life of critical components. The KX250's high-revving four-stroke engine relies on a clean and efficient cooling system, making coolant service especially important for riders demanding peak performance lap after lap.
Tools & Supplies Needed
- Fresh motorcycle-compatible coolant
- 10 mm socket or wrench
- Phillips screwdriver
- Rags
- Drain pan
- Optional: Funnel for refilling
Step-by-Step Coolant Change Guide
- Let your KX250 cool completely. Never attempt to open the cooling system on a hot engine.
- Remove your radiator shrouds (optional). This isn’t strictly necessary, but it can provide better access to the filler neck and caps.
- Remove the radiator cap. Twist off slowly to relieve any residual pressure.
- Locate and remove the coolant drain bolt. On the 2019 KX250, the drain bolt is typically on the water pump cover (right side, low on the engine case) and is usually a 10 mm bolt, often with a small copper washer.
- Open the system bleeder screw. Some Kawasaki models, including the KX250, have a bleeder screw on the left side of the radiator. Loosening this with a Phillips screwdriver helps fully drain the system and prevents vacuum lock.
- Drain old coolant. Allow it all to flow into your drain pan. Dispose of old coolant properly—do not dump it outdoors.
- Reinstall the drain bolt. Tighten to 7.0 N-m (62 in-lb) to prevent leaks. If your model uses a copper washer, inspect or replace it as needed.
- Refill the cooling system. Pour in the recommended volume of fresh coolant (about 1.2 liters or 1.3 quarts) until the fluid reaches the neck of the radiator filler. Use a funnel for cleaner filling.
- Bleed the system. Close the bleeder screw once coolant runs from it with no bubbles. Top off the radiator if needed.
- Check for leaks. Wipe down the area and inspect all fittings and drain bolts for seepage.
- Reinstall the radiator cap. Run the engine briefly. With the cap back on, let the bike idle for a couple minutes to circulate the coolant, then shut it off and check the level again. Top off if necessary.
Model-Specific Tips for the 2019 Kawasaki KX250
- The 2019 KX250 cooling system holds just over 1.2 liters of coolant. Use only high-quality premixed or properly diluted coolant compatible with aluminum radiators and modern dirt bike engines.
- The KX250 is known for having a compact radiator system for lightweight performance. That makes it even more important to keep it free of obstructions and running fresh coolant to prevent hot spots under race conditions.
- Always inspect your radiator cap and hoses for wear or cracks. Even minor leaks can impact cooling performance on this high-performance engine.
Service Interval & Advice
- Change coolant at least once per season or every 24 riding hours—more often if you race or ride in muddy, sandy, or extreme conditions.
- If switching coolant types (for example, between a water-based and non-water coolant), flush the system thoroughly to avoid chemical incompatibility or residue buildup.
- Avoid using plain tap water as coolant, which can cause corrosion in the aluminum components.
Whether maintaining your KX250 for the trails or prepping for the next race, keeping the cooling system in top shape ensures your engine stays cool no matter how hard you ride.
Related Shopping Categories
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Shop Radiator Hoses for a 2019 Kawasaki KX250 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.