How to Change the Coolant in a 2019 KTM 350SXF

Shop parts for a 2019 KTM 350SXF Dirt Bike.

Regularly changing the coolant in your 2019 KTM 350SXF is crucial for keeping the engine running at the optimal temperature, preventing overheating, and extending the life of your dirt bike's components. The following guide, developed exclusively for MotoSport, walks you through the procedure and highlights important details unique to this model.

Essential Tools & Supplies

  • New coolant (always use a product suitable for high-performance KTM engines)
  • 8 mm socket or wrench
  • Catch pan or container for old coolant
  • Funnel (optional, for clean pouring)
  • Clean rag or towel for spills
  • Engine guard removal tools (if equipped)

Preparation

  • Allow the engine to cool completely before starting. Never open the radiator cap on a hot engine due to the risk of pressurized coolant spray.
  • Stand the bike upright on level ground and ensure it is secure.

Draining the Old Coolant

  • Locate the radiator cap on the right side of the bike. Slowly unscrew the cap to release any residual pressure.
  • Find the coolant drain bolt on the water pump cover – typically an 8 mm bolt. Place your catch pan directly underneath to collect old coolant.
  • Remove the drain bolt to begin draining. Allow fluid to fully empty from both radiators. Dispose of used coolant responsibly, as it is toxic and environmentally harmful.

Flushing the Cooling System (Optional but Recommended)

  • If you notice debris or old coolant of questionable quality, fill the system with distilled water and run the engine briefly.
  • Repeat the drain process. This can help clear out any lingering residue from the radiators and lines.

Refilling the System

  • With the drain bolt securely reinstalled, slowly pour in the new coolant through the radiator neck.
  • Fill the system until the coolant reaches about 10 mm (0.39 in) above the radiator fins – do not overfill.
  • The 2019 KTM 350SXF typically requires approximately 1.2 liters (1.3 quarts) of coolant. Always double-check your specific owner's manual for the correct amount, as small variances may occur between models and aftermarket radiators.

Finishing Up

  • Replace and secure the radiator cap.
  • Reinstall the engine guard, if you removed one.
  • Start the bike and let it idle for a few minutes. Check for leaks and observe the coolant level after the engine cools down again, topping off as necessary.
  • Take a short test ride, then recheck the level once more, since air bubbles may work themselves out on the first run-in.

Special Notes for the 2019 KTM 350SXF Owner

  • Performance focus: The high-compression, high-revving engine in the 350SXF generates more heat than recreational models, making proper coolant maintenance even more critical.
  • Radiator integrity: Aftermarket radiators or guards can affect coolant capacity. Always inspect for physical damage, especially after races or rough rides.
  • Sensitive sensors: The 350SXF is equipped with sensors that may trigger warnings if the bike overheats. If you see any alerts after a coolant change, double-check for air in the system or under-filled radiators.

Coolant Safety

  • Avoid direct contact with skin or eyes, and never ingest coolant. Change clothing immediately if spilled on your body, and rinse skin with plenty of water. Coolant is toxic if swallowed.
  • Store unused coolant out of reach of children and pets.

Following this guide helps ensure that your 2019 KTM 350SXF remains in peak racing form and protected against fluctuating temperatures. For premium coolant products, OEM replacement parts, and all your maintenance needs—MotoSport has you covered.

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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.