How to Change the Coolant in a 2020 KAWASAKI KX450
Shop parts for a 2020 KAWASAKI KX450 Dirt Bike.
A proper coolant change is vital to keep your 2020 Kawasaki KX450 running cool and performing at peak levels on the track or trail. Here is a step-by-step guide specifically focused on your KX450, with tips every owner should know about this championship-ready machine.
What You Will Need
- High-quality motorcycle coolant suitable for aluminum engines
- 10 mm socket or wrench
- Phillips screwdriver (for radiator panel and bleeder screw)
- Rag for cleanup
- Drain pan or container to collect old coolant
- Rubber gloves (optional, but recommended)
Step-by-Step Coolant Change
-
Prep the Bike
Place your KX450 on a stable motocross stand. Make sure the bike is completely cool before starting to avoid burns from hot coolant or engine components. -
Remove the Radiator Cap
Unscrew and remove the left radiator shroud for access. Slowly twist off the radiator cap to release any built-up pressure in the system. -
Drain Old Coolant
Using a 10 mm socket, remove the coolant drain bolt located at the bottom of the water pump cover on the right side of the engine. Position the drain pan underneath to capture draining fluid.
The KX450 features a bleeder screw on the radiator or a small bolt near the top of the cylinder headundo this with a Phillips screwdriver to help coolant flow out cleanly and to avoid vacuum lock. -
Flush (Optional but Recommended)
For a thorough flush, briefly reinstall the drain bolt and fill the radiator with clean, distilled water. Bleed, drain, and repeat as needed until clear water exits. This is especially important if switching coolant types. -
Reinstall Drain Bolt and Bleeder
Ensure the sealing washer is in good shape and reinstall the drain bolt snugly, but do not overtighten. Tighten the radiator bleeder screw gently. -
Add Fresh Coolant
Slowly pour new coolant into the radiator. Tap the hoses gently to help dislodge air pockets. Fill until coolant is visible just below the neck. -
Bleed the System
Loosen the bleeder screw until coolant seeps out (no bubbles), then snug it up. Rock the bike side-to-side to further purge air, then top off coolant as necessary. -
Replace the Radiator Cap and Shroud
Confirm the cap is securely fastenedlisten for two distinct clicks on the KX450's pressure cap. Reinstall the shroud. -
Check for Leaks and Top Off
Wipe down the bike, start and idle the engine for a few minutes, then shut it off and recheck coolant level. Top off if needed.
Specific Tips for the 2020 KX450
- The KX450's lightweight aluminum radiators are efficient but sensitivealways use coolant marked safe for aluminum engines to prevent corrosion and overheating.
- Inspect radiator hoses and clamps during the change for signs of wear or crackingreplacement parts are easily available if needed.
- Check coolant at regular maintenance intervals, especially after hard rides or overheating events. Kawasaki recommends a coolant change approximately every 2 years, but more frequent changes benefit frequent racers.
Proper Disposal
Used coolant is toxicbe sure to dispose of both old coolant and rinse water at an authorized recycling or hazardous waste facility. Never pour coolant on the ground or down drains.
Enjoy Confident Riding
Regular coolant changes help your 2020 Kawasaki KX450 maintain peak power and reliability. With a fresh fill and a quick cooling system check, your KX is set for more brilliant laps and reliable trail adventures.
Related Shopping Categories
Shop Radiators for a 2020 KAWASAKI KX450 Dirt Bike.
Shop Coolant for a 2020 KAWASAKI KX450 Dirt Bike.
Shop Temperature Sensors for a 2020 KAWASAKI KX450 Dirt Bike.
Shop Tools for a 2020 KAWASAKI KX450 Dirt Bike.
Shop Radiator Hoses for a 2020 KAWASAKI KX450 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.