How to Change the Coolant in a 2020 KTM 250SXF

Shop parts for a 2020 KTM 250SXF Dirt Bike.

Regular coolant changes are essential for the high-performance 2020 KTM 250SXF, ensuring optimal engine temperature and long-term reliability. Follow this step-by-step guide tailored for your KTM motocross machine:

Tools & Supplies Needed

  • New, manufacturer-recommended coolant
  • 8 mm socket or wrench
  • Drain pan or container
  • Funnel
  • Torque wrench (recommended)
  • Clean rag
  • Protective gloves

Step 1: Let Your Bike Cool

Allow the engine to cool completely before any work starts. Changing coolant while hot can cause injury and may damage engine components.

Step 2: Remove the Skid Plate (If Applicable)

If your 250SXF has a skid plate, remove it to access the water pump drain bolt.

Step 3: Open the Radiator Cap

With the bike on a stable stand, open the radiator cap. This relieves pressure and allows coolant to drain freely.

Step 4: Drain the Old Coolant

  • Locate the 8 mm drain bolt on the water pump cover (right side of engine).
  • Place your drain pan underneath.
  • Remove the bolt carefully and let all coolant drain out.
  • You may also loosen the lower radiator hose or remove the T-pipe if you want a more thorough drain.

Step 5: Reinstall the Drain Bolt

Once draining is complete, inspect the washer and threads for wear. Reinstall the drain bolt and tighten firmly (use a torque wrench if possible to match KTM specs).

Step 6: Add New Coolant

  • Using a funnel, pour new coolant into the radiator until the fluid sits about 10 mm above the radiator fins while the engine is cold.

Step 7: Bleed the Cooling System

  • Some KTM models have a bleeder screw on or near the top of the cylinder head. Loosen this briefly once coolant is added until coolant (not air) runs cleanly, then retighten.
  • Top up the coolant again if necessary.

Step 8: Secure the Radiator Cap

Install the radiator cap firmly. Double check for leaks around the drain bolt and hoses.

Step 9: Inspect After First Ride

After a short ride, let the bike cool and check the coolant level. Top off if needed.

Special Notes for the 2020 KTM 250SXF

  • This model features lightweight radiators and a high-revving engine–using premium motorcycle-specific coolant is best for corrosion protection and heat transfer.
  • Regularly inspect the radiator fins for clogging and damage, especially after muddy rides.
  • If the bike runs hot repeatedly, check for trapped air in the system.

Taking care of your bike's cooling system keeps your 2020 KTM 250SXF running strong—hit the track or trails with confidence.

Related Shopping Categories

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Shop Tools for a 2020 KTM 250SXF Dirt Bike.

Shop Radiator Hoses for a 2020 KTM 250SXF Dirt Bike.

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.