How to Change the Coolant in a 2016 KTM 250XCW: MotoSport Guide

Shop parts for a 2016 KTM 250XCW Dirt Bike.

Routine coolant changes are essential for the performance and longevity of your 2016 KTM 250XCW. This guide from MotoSport walks you through each step and highlights details unique to this model, so you can keep your bike running cool on the trails.

Why Change the Coolant?

Fresh coolant protects your KTM 250XCW's engine against overheating and corrosion. KTM recommends changing the coolant every 40 to 50 hours of run time or at least once per riding season. If you've recently purchased a used bike or don't know when the last coolant change was performed, it's best to do it now for peace of mind.

What You'll Need

  • New coolant (use a quality motorcycle-specific coolant)
  • 10mm wrench or socket
  • Drain pan
  • Funnel
  • Clean rags
  • Deionized or distilled water (if flushing is needed)
  • Safety gloves and eye protection

Preparation

  • Ensure the engine is completely cool to prevent burns.
  • Put the bike on a stable stand or lift for easier access.
  • Remove the seat and gas tank if extra access to the radiator cap is required.

Draining the Old Coolant

  1. Locate the radiator cap and carefully loosen it to relieve pressure before fully removing.
  2. Find the coolant drain bolt on the lower side of the water pump cover (right side of the engine) and place the drain pan underneath.
  3. Remove the drain bolt with a 10mm wrench. Allow all coolant to flow out. Tilting the bike gently side to side helps drain residual coolant.

Tip: Inspect the coolant for discoloration or debris. Milky coolant can indicate other engine issues.

Flushing the System (If Needed)

  1. Reinstall the drain bolt and pour distilled water into the radiator until full.
  2. Run the engine briefly (1–2 minutes), shut it off, and drain again. Repeat until clear.
  3. Replace the drain bolt securely.

Refilling with New Coolant

  1. Use a funnel and fill the radiator slowly with the recommended coolant. The total capacity is about 0.9 liters (30 fl oz) for the 250XCW.
  2. Elevate the front wheel about 19 inches, if possible, to help air escape from the system, as outlined by the manufacturer.
  3. Look for air bubbles. Gently squeeze radiator hoses to help purge trapped air.
  4. Replace the radiator cap securely.

Checking for Leaks and Final Steps

  • Start the engine and let it run until warm. Check the coolant level after the bike cools and top off as needed.
  • Inspect for leaks around the radiator, hoses, and drain bolt.
  • Reinstall the seat and tank if removed.

Model-Specific Notes for the 2016 KTM 250XCW

  • This two-stroke utilizes a robust cooling system–always use coolant compatible with magnesium crankcases.
  • The radiator cap can be tight or seize from residue–loosen carefully to avoid damage.
  • Regularly check overflow hoses and clamps, as vibration may loosen fittings over time.
  • If installing performance radiators or guards, verify proper airflow to avoid overheating.

Staying on top of routine cooling system maintenance prevents expensive repairs and ensures maximum performance from your KTM 250XCW on every ride.

Related Shopping Categories

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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.