How to Change the Coolant in a 1995 Kawasaki KX125
Shop parts for a 1995 Kawasaki KX125 Dirt Bike.
Keeping your 1995 Kawasaki KX125's cooling system maintained is critical for engine longevity and optimum performance, especially when riding and racing in demanding environments. Performing a coolant change is straightforward and helps prevent overheating, corrosion, and costly repairs. Below are step-by-step instructions uniquely tailored to your KX125, with special notes on what makes this iconic two-stroke stand out.
What You'll Need
- Permanent type antifreeze (for aluminum radiators), premixed 50% coolant & 50% soft (distilled) water
- Ratchet or 8mm socket/wrench
- Drain pan
- Funnel
- Protective gloves
- Shop rags
Coolant Capacity and Specification
- Total coolant volume: 0.96 L
- Use green coolant formulated for aluminum engines and radiators to prevent corrosion
- Do not use pure water or straight coolant; always mix 50% coolant with 50% distilled water
Step-by-Step Coolant Change Guide
-
Let your bike cool completely.
Never remove the radiator cap when the engine is hot to avoid burns—hot coolant and steam can cause serious injuries. -
Remove the radiator cap.
Position the bike upright on level ground. Turn the cap counterclockwise to the first stop, pause to release excess pressure, then continue removing it. -
Position your drain pan beneath the cylinder/head area.
On the KX125, the *coolant drain bolt* is usually found at the bottom of the water pump cover (right side of engine). Use an 8mm socket or wrench to loosen and remove it. -
Drain old coolant completely.
Allow the coolant to flow fully into the pan. Tilting the bike gently side-to-side ensures maximum drainage. -
Inspect the old coolant.
If the coolant looks brown, milky, or contains debris, further cooling system cleaning or inspection for head gasket failure may be needed. -
Reinstall the drain bolt.
Clean the bolt and its sealing washer. Tighten moderately–do not overtighten, as the water pump cover is aluminum and can be damaged easily. -
Pour in fresh coolant.
Use a funnel for precision. Fill through the radiator cap opening until coolant is visible at the top. The KX125 requires about 0.96 L of coolant, but always check your specific fill level. -
Bleed air from the system.
With the cap off, briefly start the engine. Let it idle a minute to help expel trapped air bubbles (watch coolant level – add more if it drops). Then shut off the engine. -
Top off and reseal.
Refill to the correct level if needed and reinstall the radiator cap securely. -
Check for leaks and clean up.
Inspect the drain bolt, hoses, and around the radiator. Wipe up any spilled coolant immediately, as it's hazardous to people and pets.
Special Notes for the 1995 KX125 Owner
- Radiator Construction: Early KX125s use aluminum radiators—never use silicate-based or automotive coolants, as they may cause internal corrosion.
- Cooling System Pressure: The radiator cap is rated for 95–125 kPa (14–18 psi). A weak or failing cap can cause overheating; replace if in doubt.
- Troubleshooting: If your KX125 is losing coolant or overheating, check the water pump for leaks, the head gasket for signs of failure, and ensure the radiator fins are clean and unbent.
- Off-Season Storage: If storing your bike for a long period, refreshing the coolant before storage helps prevent internal corrosion and coolant breakdown.
Eco-Friendly Tip
Dispose of old coolant properly—never pour it on the ground or down a drain. Use local hazardous waste collection points.
With these instructions, your 1995 KX125 will be ready to take on the track with dependable cooling and peak performance.
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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.