How to Change the Coolant in a 1987 Kawasaki KX250
Shop parts for a 1987 Kawasaki KX250 Dirt Bike.
Proper coolant maintenance is key for the performance and longevity of your 1987 Kawasaki KX250. This model features a high-revving, liquid-cooled two-stroke engine that relies on optimal coolant flow and temperature management. Follow these proprietary MotoSport instructions for a safe and effective coolant change tailored to the unique needs of the KX250.
What You Will Need
- New coolant (Permanent type of antifreeze for aluminum engines, green, 50% soft water, 50% coolant)
- Catching pan
- 8 mm wrench or socket
- Phillips screwdriver
- Clean rags
- Latex gloves (optional)
Pre-Change Notes Specific to the 1987 KX250
- Coolant capacity: 1.1 L
- Use a coolant suitable for aluminum radiators and engine components to prevent corrosion.
- Ensure you change coolant only when the engine is cold to avoid personal injury from burns.
Step-by-Step Coolant Change Process
- Prepare the bike: Place the KX250 on a stand so it sits upright and is stable.
- Remove the radiator cap:
- Turn the cap counterclockwise to the first stop and let any pressure release.
- Press down and continue turning to fully remove the cap. Never do this with a hot motor.
- Locate and remove the coolant drain bolt:
- The coolant drain bolt is commonly found on the right side of the engine; it will have a washer under it.
- Position a drain pan beneath, then remove the bolt using an 8 mm wrench.
- Drain the coolant:
- Allow all old coolant to flow into the pan.
- For a more thorough flush, you may also remove the lower radiator hose (optional).
- Inspect and clean:
- Check the old coolant for signs of rust or debris (an indication of internal corrosion).
- Inspect the radiator finsremove any blockages with a soft brush. If fins are bent, gently straighten with a thin screwdriver for optimal airflow.
- Reinstall the drain bolt:
- Replace the washer if damaged. Torque the bolt securely to avoid leaks.
- Refill with new coolant:
- Pour the new 50/50 coolant mixture slowly into the radiator until it reaches the neck.
- Bleed air from system:
- Tilt the bike gently side-to-side to release trapped air bubbles.
- Top off coolant as needed, ensuring it's at the correct level.
- Replace the cap:
- Reinstall the radiator cap securely.
- Run and recheck:
- Start the engine and let it idle for several minutes with the bike upright.
- Shut off and allow to cool, then check and top up coolant level if necessary.
KX250 Owner Tips & Model-Specific Notes
- The 1987 KX250 relies on an efficient cooling system for peak performanceoverheating can lead to premature wear or engine seizure on these air-cooled two-stroke models.
- Regularly inspect all cooling system hoses and the water pump for leaks or cracks, as replacement parts are still supported and available.
- Re-torque all bolts after your first ride post-service to counter vibration loosening on older bikes.
- Use only non-silicate coolants formulated for motorcycles to avoid damaging aluminum internals and water pump seals.
Routine coolant changes are simple preventive maintenance that protect your classic Kawasaki KX250keeping you riding strong whether you hit the motocross track or your favorite trail system. Always follow recommended coolant type and procedures for lasting results and safe performance.
Related Shopping Categories
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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.