How to Change the Coolant in a 2014 Kawasaki KLX250S

Shop parts for a 2014 Kawasaki KLX250S Dirt Bike.

Regularly changing the coolant in your 2014 Kawasaki KLX250S keeps your engine running at optimal temperature and prevents costly overheating damage. The KLX250S uses a liquid cooling system, and servicing it is essential for both reliability and performance. Below is a proprietary step-by-step guide designed for MotoSport customers – giving you everything you need to do the job right.

What You Need

  • Phillips screwdriver or 8mm socket – For removing the radiator shrouds and side panels
  • 10mm socket and ratchet – For water pump drain bolt
  • Drain pan – To catch old coolant
  • Funnel – For clean coolant refill
  • Distilled water – For rinsing the system if needed
  • Approved motorcycle coolant (silicate-free)
  • Clean rags
  • Gloves – Coolant is toxic and should not contact skin

Step-by-Step Instructions

  1. Prep the KLX250S
    • Ensure the engine is completely cool – never open a hot cooling system.
    • Support the bike on a stand, keeping it upright and level.
  2. Remove Side Panels and Radiator Shrouds
    • Use a Phillips screwdriver or an 8mm socket to remove the left-side radiator shroud and the left side panel.
    • This gives unobstructed access to the radiator cap and the coolant overflow reservoir.
  3. Remove the Radiator Cap
    • With the bike cool, slowly open the radiator cap to relieve any residual pressure.
  4. Drain the System
    • Place a drain pan under the water pump.
    • Locate the coolant drain bolt at the lowest point of the water pump (generally on the right-hand side of the engine casing).
    • Remove the drain bolt with a 10mm socket and allow all coolant to drain out.
    • Remove the overflow reservoir cap – drain the reservoir by either siphoning or tilting the bike as needed.
  5. Optional: Flush the Cooling System
    • If the old coolant is particularly dirty or contaminated, reinsert the drain bolt and fill the radiator and overflow with distilled water.
    • Run the engine for a couple of minutes, let it cool completely, then repeat the drain process.
  6. Replace the Drain Bolt
    • Inspect the copper crush washer on the drain bolt; replace if damaged.
    • Tighten the bolt securely, but do not overtighten.
  7. Refill with New Coolant
    • Using a funnel, slowly add fresh, silicate-free motorcycle coolant to the radiator until it reaches the top of the filler neck.
    • Fill the overflow reservoir to the full line.
  8. Bleed the System
    • With the radiator cap off, briefly start the engine and let it idle.
    • Watch for air bubbles escaping; gently squeeze the radiator hoses by hand to help purge air.
    • Top off coolant if the level drops.
    • Once bubbling stops, install the radiator cap securely.
  9. Reinstall Bodywork
    • Reinstall the side panels and shrouds.
  10. Final Checks
    • Let the bike cool, then recheck coolant levels in both the radiator and reservoir after your first ride.
    • Top off as needed.
    • Safely dispose of old coolant per local waste regulations.

KLX250S Model-Specific Tips

  • The 2014 KLX250S uses a relatively small cooling system. Take care not to overfill – use the marks on the overflow tank as your guide.
  • If you frequently ride off-road or in hot temperatures, check coolant level before every ride.
  • Use only silicate-free, motorcycle-approved coolant to prevent water pump and seal wear.
  • Inspect radiator hoses for cracks or swelling, and replace if needed – these parts can degrade after years off-road.
  • Be aware that mixing brands and types of coolant is not recommended for this model due to potential chemical incompatibility.

This MotoSport.com guide makes routine cooling system service on your KLX250S simple, giving you peace of mind for every ride.

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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.