How to Change the Coolant in a 1999 Kawasaki KX60
Shop parts for a 1999 Kawasaki KX60 Dirt Bike.
Maintaining your 1999 Kawasaki KX60 is essential for top performance & longevity, and a coolant change is one of those crucial but often overlooked tasks. Following these step-by-step instructions will keep your bike running cool, whether you are on the track or the trail. The KX60, known for its lightweight frame & high-revving two-stroke engine, runs a liquid-cooled system that must be properly maintained to prevent overheating or engine damage.
Important Notes for KX60 Owners
- KX60s use a simple, single-radiator system — ensure you use recommended motorcycle coolant for aluminum engines to prevent corrosion.
- Never attempt to change coolant on a hot engine; serious burns or engine damage can result.
Tools & Supplies Needed
- Fresh pre-mixed coolant for two-stroke motocross bikes (silicate-free, suitable for aluminum)
- 8mm socket or wrench
- Phillips screwdriver (for plastic guards/covers if needed)
- Drain pan
- Rag or paper towels
- Distilled water for rinsing, if desired
- New sealing washer for the drain bolt (recommended)
- Funnel (optional, but helpful)
Step-by-Step Coolant Change for the Kawasaki KX60
- Let the bike cool thoroughly. Only work on the cooling system when the engine is completely cool to avoid burns or pressure spray.
- Remove the radiator cap. Locate the cap at the top of the radiator on the left side. Twist gently (counterclockwise) and set aside. If your dirt bike has a radiator guard, remove it first using a Phillips screwdriver.
- Position the drain pan. Place it directly under the water pump area (bottom right side of the engine).
- Remove the coolant drain bolt. Using your 8mm socket, find and remove the coolant drain bolt at the bottom of the water pump housing. Allow all old coolant to drain completely into your pan. Many KX models also have a small washer here; inspect & replace if needed.
- Flush the system (optional, but recommended). Pour a small amount of distilled water into the radiator and let it drain out to flush contaminants. Do not use tap water unless absolutely necessary due to mineral content, which can harm the system.
- Reinstall the drain bolt. Replace the sealing washer if necessary. Tighten the bolt securely, but do not overtighten — the water pump housing is aluminum and can strip easily.
- Slowly fill with new coolant. Use a funnel to pour coolant into the radiator until it is just below the neck. Filling slowly helps avoid air bubbles, which can cause hot spots and overheating.
- Bleed air from the system. Gently rock the bike side to side to free trapped air. If your KX60 has a bleeder screw (some models do), briefly loosen it to let air escape while filling, then tighten back when coolant runs out bubble-free.
- Replace the radiator cap. Once the system is full and air has been purged, reinstall the cap securely.
- Run the engine & recheck coolant level. Start the bike and let it idle for three minutes. Rev it gently a few times, then shut the engine off. Let it cool for a minute, then remove the radiator cap and check the level — top off as needed. Replace the cap.
- Check for leaks. Inspect the drain bolt, hoses, and radiator seam for leaks before riding.
After the Coolant Change
- Inspect the fluid level after your first few rides; new coolant can settle after bleeding.
- If your KX60 overheats or loses coolant rapidly, check for hose cracks, loose clamps, or a worn-out radiator cap.
Regular coolant maintenance protects your 1999 Kawasaki KX60’s small but mighty two-stroke engine from severe heat damage. Always use motorcycle-specific, aluminum-compatible coolant, and never mix different types. With a cool-running motor, you can focus on the ride—not the temperature gauge.
Related Shopping Categories
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Shop Tools for a 1999 Kawasaki KX60 Dirt Bike.
Shop Radiator Hoses for a 1999 Kawasaki KX60 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.