How to Change the Coolant in a 2014 KTM 350EXCF

Shop parts for a 2014 KTM 350EXCF Dirt Bike.

Keeping your 2014 KTM 350EXCF running at peak performance means routine maintenance – and that includes regular coolant changes. Coolant is vital for engine temperature control and system longevity, especially for aggressive dirt riding or high-heat conditions. Below are MotoSport's proprietary steps for changing the coolant on your KTM 350EXCF, plus model-specific tips every owner should know.

Required Tools and Materials

  • Fresh, KTM-approved coolant
  • Distilled water (for flushing; optional but recommended for maximum cleanliness)
  • Container to catch old coolant
  • 8mm socket or wrench
  • Funnel
  • Shop rags
  • Gloves and eye protection

Step-by-Step Coolant Change Procedure

  1. Ensure the bike is cool: Never open the radiator cap on a hot engine. Let the 350EXCF cool down fully before any work begins.
  2. Remove the radiator cap: Slowly turn and remove the radiator cap to release residual pressure and prevent accidental spray.
  3. Locate and remove the coolant drain bolt: On the 2014 KTM 350EXCF, the coolant drain bolt is at the bottom of the water pump housing on the right side of the engine. Place your container underneath, use your 8mm socket or wrench to remove the drain bolt, and let the coolant fully drain.
    Note: Tilting the bike gently side-to-side can help evacuate all the old coolant.
  4. Optional - Flush with distilled water: Reinstall the drain bolt, fill the system with distilled water, and replace the radiator cap. Start the bike, let it idle for five minutes, then shut it off, allow it to cool, and repeat steps 2–3 to remove flushed water. This step is highly recommended if old coolant appears dirty, rusty, or contaminated.
  5. Reinstall drain bolt: Inspect the drain bolt washer and replace if necessary. Tighten the drain bolt securely, but do not overtighten.
  6. Add new coolant: Using a funnel, pour your new coolant into the radiator neck until near full. Squeeze the upper radiator hose gently with your hand to help force out air bubbles. Top off as needed.
  7. Bleed the cooling system: The 350EXCF benefits from a system bleed for complete air removal. Elevate the front wheel slightly if possible (a stand or block under the front wheel works), and fill coolant until no bubbles rise at the radiator neck. Some models have bleed screws on the cylinder or thermostat area – consult your service manual for precise locations.
  8. Replace the radiator cap: Securely reinstall the radiator cap.
  9. Run and check: Start the engine and let it reach operating temperature. Check for leaks, then allow it to fully cool. Double check coolant level and top off as needed.
  10. Properly dispose of the old coolant: Used coolant is hazardous; always recycle or dispose of it according to local regulations.

2014 KTM 350EXCF Owner Tips

  • Cooling system capacity: The 350EXCF holds approximately 1.2 liters (1.27 US quarts) of coolant. Overfilling can lead to overflow, while underfilling risks overheating – always check level with the bike level on its wheels.
  • Preferred coolant type: Use only nitrite-free, high-quality motorcycle coolant compatible with aluminum radiators & magnesium cases. Avoid mixing coolant types unless specified as compatible on the label.
  • Overheating notice: This model, like many performance four-strokes, runs hot in technical riding. A clean radiator, fresh coolant, and an operational fan (if equipped) are vital. Consider adding a coolant recovery tank for extra protection against boil-over.
  • Frequent coolant loss or overheating: These can indicate leaking hoses, a failing radiator cap, or head gasket issues. Inspect components closely at every coolant change.

Regular coolant changes don't just extend the life of your 2014 KTM 350EXCF engine – they help you ride harder, longer, and with confidence on any trail. By following MotoSport's exclusive guide, you invest in reliable performance and safer adventures every season.

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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.