How to Change the Coolant in a 2020 Kawasaki KX100: MotoSport Dirt Bike Guide
Shop parts for a 2020 Kawasaki KX100 Dirt Bike.
Regular coolant changes are essential for keeping your 2020 Kawasaki KX100 running at peak performance–ensuring proper engine cooling, preventing corrosion, and maximizing longevity. The KX100 uses a liquid-cooled, two-stroke engine requiring coolant maintenance approximately every 40–50 hours of use or at least once per season, depending on your riding conditions and intensity. Below is a proprietary MotoSport step-by-step guide for changing the coolant on your KX100.
What You Need
- Fresh coolant (Engine Ice or similar, suitable for aluminum radiators)
- Funnel
- 10mm wrench or socket
- Phillips screwdriver
- Catch pan or container
- Clean rags
- Gloves and safety goggles (recommended)
Step-by-Step Coolant Change Process
-
Ensure the engine is cool.
Never attempt to open the radiator cap or drain the coolant on a hot engine–wait at least 30 minutes after riding. -
Remove bodywork if necessary.
If shrouds are in the way, carefully remove them for radiator access. Set screws aside safely. -
Remove the radiator cap.
Slowly loosen and remove the radiator cap to release any residual pressure. -
Locate and remove the coolant drain bolt.
On the KX100, the coolant drain bolt is typically on the water pump cover–use a 10mm wrench or socket to loosen it. Have your drain pan ready beneath. -
Drain the old coolant.
Allow the coolant to fully drain out. For more thorough drainage, gently tilt the bike toward the drain side. Dispose of spent coolant according to local environmental regulations. -
Remove the radiator bleeder screw.
On some Kawasaki models, including the KX100, a small Phillips bleeder screw is present on the opposite radiator. Remove it to help the system fully drain and prevent air pockets. -
Inspect hoses and clamps.
Before refilling, check for cracks, leaks, or aged clamps. The KX100 uses rubber radiator hoses–replace if any deterioration is found. -
Reinstall drain bolt and bleeder screw.
Hand-tighten and then snug them–do not overtighten, as the water pump cover threads are aluminum. -
Refill with fresh coolant.
Insert the funnel into the radiator fill neck. Slowly pour the new coolant to the top of the radiator. Once the radiator is full, briefly install the cap and gently rock the bike or kickstart it several times (without starting) to help move air bubbles through the system. -
Bleed the cooling system.
Remove the radiator cap and the bleeder screw again to let trapped air escape. Top off with coolant if needed. Reinstall the bleeder and cap once no further bubbles are seen. -
Final checks.
Clean up any spills, reinstall bodywork, and start the engine. Let it idle for a few minutes, then shut it down and recheck coolant level. Top off as necessary.
Special Notes for 2020 KX100 Owners
- The KX100's compact two-stroke engine can be sensitive to overheating–always use high-quality coolant designed for aluminum radiators.
- Coolant service intervals are particularly important for racers and those riding in sandy or muddy conditions where radiators may become clogged.
- If you notice white residue around the radiator/cap area or persistent air bubbles, inspect for head gasket issues or leaks.
- Flush with distilled water if changing to a different type of coolant (e.g., switching from ethylene glycol to propylene glycol based).
Routine coolant changes help ensure your 2020 Kawasaki KX100 stays cool out on the track or trail. For OEM parts, hoses, fresh coolant, and more, MotoSport has everything you need to keep your ride ready.
Related Shopping Categories
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Shop Radiator Hoses for a 2020 Kawasaki KX100 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.