How to Change the Coolant in a 1993 Kawasaki KX250

Shop parts for a 1993 Kawasaki KX250 Dirt Bike.

Regularly changing the coolant in your 1993 Kawasaki KX250 is critical for optimal engine performance and longevity. The KX250 features an aluminum engine and radiators, so it's important to use the right type of coolant and follow the correct procedure to avoid internal corrosion and overheating issues specific to this model.

What You Will Need

  • Permanent type coolant (ethylene glycol base, aluminum compatible, no silicates or phosphates)
  • Soft water for mixing, if necessary
  • 8mm socket or wrench (for drain plugs and covers)
  • Drain pan
  • Clean rags
  • Torque wrench (optional but recommended)
  • Protective gloves and eyewear

Coolant Specification

  • Total system capacity: 1.1 L (1.2 US qt)
  • Recommended Ratio: 50 percent coolant, 50 percent soft water

Step-by-Step Guide

  1. Allow your KX250 to cool completely.
    Never try to open the cooling system when hot – coolant is pressurized and can cause burns.
  2. Set the bike upright on a stable stand.
    Make sure it's perpendicular to the ground for proper draining.
  3. Remove the radiator cap.
    Turn the cap counterclockwise to the first stop and wait briefly. Press down and continue turning to fully remove the cap. This two-step process is essential to safely release built-up pressure.
  4. Locate and remove the coolant drain bolts.
    On the 1993 KX250, there are usually two drain bolts:
    – One on the water pump cover (torque spec: 8.8 Nm)
    – One on the cylinder
    Position your drain pan underneath and remove these bolts. Allow all the old coolant to fully drain out.
  5. Inspect for debris or contaminants.
    Check the drained coolant. If it is very dirty, flush the system with distilled water and repeat the drain process.
  6. Reinstall drain bolts.
    Tighten to specified torque if you have a torque wrench: water pump cover bolt to 8.8 Nm, cylinder drain bolt to 22 Nm. Always inspect for gasket or O-ring damage before reinstalling.
  7. Fill the radiator with new coolant.
    Mix as specified (50:50 coolant to soft water), then slowly pour in coolant until it reaches the bottom of the radiator filler neck. Pouring slowly helps expel trapped air.
  8. Install the radiator cap in two steps.
    Place the cap on the filler neck, turn clockwise to the first stop, then press down and turn fully. This ensures a proper seal.
  9. Air bleed the system.
    Start the engine and let it run to full operating temperature. Shut off and allow cooling.
    Remove the right radiator cover and cap, check the coolant level. Top off as needed and reinstall the cap and cover.
  10. Inspect for leaks.
    Start the bike, let it idle, and check all joints and covers for leaks. Retorque bolts if necessary.

Model-Specific Notes for the 1993 KX250

  • The 1993 KX250 uses aluminum engine and radiator components, making coolant choice critical. Only use ethylene glycol-based coolant formulated for aluminum and free of silicates and phosphates to prevent corrosion.
  • Always double check system capacity; overfilling or underfilling can lead to overheating or inadequate cooling.
  • Kawasaki specifies checking for air pockets after initial fill, as trapped air can cause overheating. Warm up, cool down, and re-check the coolant level.
  • Do not skip periodic coolant changes – regular service is key to protecting your high-performance two-stroke's top end and water pump components.

Following these steps will keep your KX250 running cool and reliable on every ride – whether you're at the track or on the trail. If you need OEM or performance replacement parts for your cooling system, MotoSport has you covered with fast shipping and expert support.

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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.