How to Change Coolant in a 1990 Kawasaki KX60: A MotoSport.com Guide
Shop parts for a 1990 Kawasaki KX60 Dirt Bike.
Maintaining your 1990 Kawasaki KX60 isn't just about performance–it's about reliability and preventing costly repairs. Changing coolant is essential for keeping your KX60's liquid-cooled two-stroke engine running at optimal temperature and avoiding overheating. Here's a step-by-step, model-specific guide from MotoSport.com.
Tools & Supplies Needed
- 10mm socket or wrench
- Large Phillips screwdriver
- Drain pan
- Rags for cleanup
- Fresh coolant (pre-mix or mix according to bottle instructions)
- Funnel
Preparation
- Make sure the engine is completely cool before starting. Hot coolant is under pressure and can cause burns.
- Position the KX60 upright with the front wheel straight and on a stable, level surface.
Step-by-Step Coolant Change Guide
- Remove the Radiator Cap: Locate the radiator filler cap on the left side of the KX60, near the steering head. Remove the cap to release any system pressure and allow air in for smooth draining. If your KX60 is equipped with a radiator bleeder screw (less common but possible on some variants), remove this as well for maximum drainage.
- Locate and Remove the Drain Bolt: On the lower portion of the right side of the cylinder or water pump housing, find the coolant drain bolt (typically 8mm or 10mm). Position your drain pan underneath the bolt, then carefully remove it. Let all old coolant flow completely into the pan. Loosening additional hose clamps below or at the water pump may speed up draining if needed.
- Flush (Optional but Recommended): For best results, flush with distilled water before adding new coolant. Reinstall the drain bolt, fill the radiator with distilled water, run the engine for 30 seconds, shut it off, then repeat the draining step above.
- Reinstall the Drain Bolt: Ensure the sealing washer is in good shape–replace if necessary to prevent leaks. Tighten the bolt securely but avoid overtightening, which risks stripping the threads.
- Add Fresh Coolant: Using a funnel, slowly fill the radiator to the base of the filler neck. Gently rock the bike side to side to release any air trapped in the cooling system.
- Burp the System: With the cap still off, start the engine and let it idle for 30 seconds to a minute, then shut off. Air bubbles should rise out–top off coolant as needed.
- Replace the Radiator Cap: Once coolant is steady at the base of the filler neck, reinstall the radiator cap securely.
- Inspect for Leaks & Final Check: Look for leaks at the drain bolt and radiator cap area. After a short ride, allow the engine to cool and recheck the coolant level, topping off if necessary.
1990 Kawasaki KX60 Notes & Model-Specific Tips
- The KX60 has a modest coolant capacity–avoid overfilling the small radiator, as this can cause overflow when the engine heats up.
- Watch for fragile, aging hoses or plastic radiator tanks. Replace brittle parts to prevent mid-ride failures.
- If your engine overheats or loses coolant frequently after a change, check the water pump seal and cylinder head for leaks or cracks–aging 2-strokes may develop these issues.
- Use only motorcycle-safe coolant. Avoid car formulas that contain silicates or phosphates which may damage seals.
When to Change Coolant on a KX60
- Annually or every 20-40 hours of ride time, whichever comes first.
- Immediately if the coolant is discolored, oily, or contains visible debris.
Regular coolant changes keep your 1990 KX60 running cool and 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.