How to Change the Coolant in a 2017 KTM 350SXF: The MotoSport Guide

Shop parts for a 2017 KTM 350SXF Dirt Bike.

Keeping your 2017 KTM 350SXF running at peak performance means staying on top of routine maintenance, including regular coolant changes. Riders who push their KTM on the track or the trail know that proper cooling ensures consistent power delivery and engine protection through every lap. Below, MotoSport walks you through this essential processtailored specifically for your 2017 350SXFso you can wrench with confidence and keep your bike in race-ready condition.

Tools & Supplies

  • Fresh coolant (refer to your owner's manual for the recommended type and mix)
  • 8mm socket or wrench
  • Catch pan or bucket
  • Funnel
  • Rag for cleanup
  • Torque wrench (recommended)
  • Protective gloves and eyewear

Prep the Bike

  • Park the 350SXF on a stable stand and ensure the engine is cool.
  • Remove side plastics if they block access to the radiator cap or drain bolt.

Remove the Old Coolant

  • Carefully loosen the radiator cap to release any residual system pressure.
  • Locate the 8mm drain bolt (typically at the water pump case, right side of the engine).
  • Place your catch pan under the drain area.
  • Remove the drain bolt and allow all coolant to fully empty from the system.
  • If desired, you can "flush" with distilled water: reinstall the drain bolt, fill with distilled water, run the engine briefly, then drain again.–Not usually required unless the coolant appeared sludgy or contaminated–.

Refill the Cooling System

  • Reinstall and torque the drain bolt to manufacturer specs (do not overtighten).
  • Using a funnel, slowly pour new coolant into the radiator until just below the neck.
    • For the 2017 KTM 350SXF, standard coolant capacity is approximately 1.1 liters.
  • It helps to gently rock the bike or squeeze the hoses to burp any trapped air.
  • Briefly run the engine with the radiator cap off to help bubbles escape; top off as necessary. Do not let the engine overheat during this step.
  • Once bubbles stop surfacing, top to the correct fill level, then replace and tighten the radiator cap securely.

Aftercare & Inspection

  • Check for leaks at the drain bolt and around radiator connections.
  • Inspect your overflow/expansion tank if your model is equipped (some off-road versions may not have one).
  • After the first ride, recheck coolant levels as trapped air may escape and require a minor top-off.

Model-Specific Tips for the 2017 KTM 350SXF

  • This generation 350SXF features high-compression and is susceptible to performance loss if coolant levels drop or air is trapped during filling. Always ensure a thorough burping of the system.
  • Only use the coolant type recommended in your KTM manual to prevent corrosionstandard "automotive" coolant can damage internal components.
  • If you regularly ride in extreme conditions or race, inspect both radiator caps and hoses for cracks and replace as needed.
  • Take extra care not to overtighten the radiator cap, as excessive force may damage the neck or seal.
  • If coolant gets in your eyes or on your skin, rinse immediately and change clothing as the KTM manual recommends.
  • Dispose of old coolant at an approved hazardous waste collection sitenever down a drain or on the ground.

A properly cooled KTM keeps your power delivery crisp and your sessions uninterrupted. Stick to the MotoSport guide for your 2017 350SXF and enjoy reliable performance lap after lap.

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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.