How to Change the Coolant in a 2016 KTM 350SXF: Step-by-Step Guide

Shop parts for a 2016 KTM 350SXF Dirt Bike.

The KTM 350SXF is a high-performance dirt bike that depends on efficient cooling for longevity and peak results. Regular coolant changes help prevent overheating, corrosion, and internal engine damage. Here is MotoSport's proprietary method for changing the coolant on your 2016 KTM 350SXF, including key tips specific to this model for best results.

What You Need

  • Fresh, high-quality motorcycle coolant (ethylene glycol-based, no silicates recommended for KTM)
  • 8mm socket/wrench
  • Phillips screwdriver (for radiator shrouds, if necessary)
  • Catch basin or pan
  • Funnel
  • Distilled water (for optional system flush)
  • Clean shop rags
  • Torque wrench

Preparation

  • Let the engine cool completely before starting. Do not open the radiator cap on a hot engine - pressure and hot coolant can cause dangerous burns.
  • Place the 350SXF on a flat, stable surface – ideally using a stand.
  • Remove any radiator shrouds or plastics if necessary for access.

Step 1: Draining the Old Coolant

  • Position your catch basin under the water pump area on the lower right side of the engine.
  • Remove the radiator cap to release any remaining system pressure.
  • Locate and remove the coolant drain bolt on the right side of the engine (typically near the water pump, 8mm bolt). Allow coolant to drain until the flow stops completely.

Step 2: (Optional) Flushing the System

  • Reinstall the drain bolt loosely. Pour distilled water into the radiator until full, then reinstall the cap.
  • Start the bike and let it idle for 2-3 minutes, then shut it off. Remove the cap and fully drain the water out by removing the drain bolt again. Repeat as needed for extremely dirty systems.
  • Reinstall the drain bolt and torque to spec (typically 8 Nm / 6 ft-lbs) with a new washer if available to prevent leaks.

Step 3: Refilling with Coolant

  • With the drain bolt installed, slowly pour new coolant into the radiator. Use a funnel for accuracy. The KTM 350SXF generally takes around 1.1 liters (refer to your owner's manual for exact capacity).
  • Tip: For thorough bleeding, slightly loosen the radiator bleed screw (if equipped), or momentarily tilt the bike right ("burp" it) until coolant runs bubble-free, then retighten the bleed screw immediately.
  • Fill to the base of the fill neck inside the radiator.
  • Reinstall the radiator cap securely.

Step 4: Bleeding the Cooling System

  • Start the engine and let it idle for several minutes. As the engine warms, gently rev to move air pockets into the radiator. Watch for bubbles in the overflow reservoir.
  • Turn off the bike and allow it to fully cool.
  • Remove the radiator cap and top off the coolant if the level has dropped. Do the same for the overflow reservoir up to the MAX line.
  • Replace all shrouds and plastics.

Model-Specific Notes for the 2016 KTM 350SXF

  • This engine uses magnesium alloy components that are sensitive to certain additivesalways use manufacturer-approved coolant. Avoid silicate coolants, as silicates can damage water pump seals and magnesium cases.
  • Pay special attention to bleeding air from the system, as trapped air can cause overheating. Use the factory bleed screw if equipped for best results.
  • If you ride in muddy or sandy conditions, consider flushing the cooling system more frequently due to increased risk of clogging and contamination.

Post-Service Checks

  • After your first ride, check the coolant levels in both radiator and overflow tank when cool.
  • Inspect for leaks at all drain and fill points.
  • If engine temperature climbs rapidly or the fan cycles excessively, suspect air pockets and re-bleed the system.

Keeping your 2016 KTM 350SXF's cooling system fresh will maximize performance, safeguard your engine, and keep your bike ready for every MotoSport adventure.

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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.