How to Change the Coolant in a 2020 Kawasaki KX250: Step-by-Step Guide
Shop parts for a 2020 Kawasaki KX250 Dirt Bike.
Routine maintenance on your 2020 Kawasaki KX250 helps ensure optimal engine performance and longevity. The cooling system is especially important for high-revving MX bikes like the KX250, so regular coolant changes are critical. This guide will walk you through the process for the 2020 KX250 and highlight key tips specific to your model.
What You Need
- Fresh motorcycle coolant (precisely formulated for aluminum radiators)
- 10mm socket or wrench
- Phillips screwdriver
- Drain pan
- Shop rags
- Torque wrench (optional for precise reinstallation)
- Container for old coolant (for safe disposal)
Step-by-Step Coolant Change Process
- Prepare your KX250: Make sure the engine is completely cool to prevent burns. Place the bike upright on a stand for level draining. Lay shop rags to catch spills.
- Remove radiator cap: With the bike cooled, open the radiator cap to relieve system pressure and allow air entry for a smooth drain. This prevents vacuum lock and splashing–A distinctive feature of Kawasaki radiators is the small bleeder screw on the radiator side; loosen it with a Phillips to speed up draining and avoid air pockets when refilling.
- Locate and remove drain bolt: On the right side of the engine case, find the coolant drain bolt (usually 8mm or 10mm, check for a washer underneath). Place a pan underneath and slowly remove the bolt to drain the old coolant completely.
- Drain thoroughly: Let the coolant trickle out until it stops. For total drainage, you can also keep the bleeder screw open. If needed, gently lean the bike left and right.
- Reinstall drain bolt: Tighten the drain bolt back in place (recommended torque: 7.0 N-m / 62 in-lb). Do not overtighten; make sure the washer is in good shape to avoid leaks.
- Refill radiator: Pour new, premixed coolant (50/50 water/antifreeze, or as specified for your coolant) slowly into the radiator. Fill until the coolant reaches the bottom of the filler neck. Allow time for bubbles to escape.
- Bleed air from the system: Carefully tighten the bleeder screw once you see coolant flowing out–this ensures any trapped air is removed for consistent cooling performance.
- Check for leaks and replace cap: Inspect all connections, cap, and the drain bolt for leaks. Install the radiator cap, ensuring it locks past the safety tabs.
- Start and recheck: Start the bike and let it idle for a few minutes. Watch the temperature and inspect for leaks. After cool down, re-open the cap and top up coolant if the level dropped as air escapes.
Particular Notes for the 2020 Kawasaki KX250 Owner
- Bleeder screw: The KX250's bleeder is a unique feature among motocross bikes–using it reduces air pockets and overheating risks.
- Capacity: The cooling system holds about 1.2 liters, so have enough coolant on hand for a full flush.
- Inspect hoses & cap: Check for worn radiator hoses or a damaged cap. Addressing minor issues now prevents bigger problems during races or trail rides.
- Environment: Always dispose of old coolant responsibly–it is toxic and should never be poured down a drain or onto the ground.
Changing your KX250's coolant is an easy job that delivers big protection against engine damage. By following these model-specific steps, you'll keep your dirt bike running strong, lap after lap.
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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.