How to Change the Coolant in a 2017 KTM 250XCW

Shop parts for a 2017 KTM 250XCW Dirt Bike.

Keeping your 2017 KTM 250XCW running cool is essential for peak performance and long engine life. Regularly changing the coolant helps prevent overheating, corrosion, and internal buildup that can damage your dirt bike. Unlike many four-strokes in the lineup, the 250XCW two-stroke features a simple, effective cooling system with a service routine that’s easy for most riders to tackle in their own garage. This proprietary MotoSport guide walks you through every step, pointing out unique features of the 250XCW to ensure a smooth, mess-free coolant change.

What You Need

  • Fresh coolant (ensure compatibility with aluminum radiators and KTM specs)
  • 8 mm socket or wrench
  • Drain pan/container
  • Funnel (recommended for refill)
  • Shop towels
  • Torque wrench (to reset drain bolt, optional but ideal)
  • Protective gloves and eyewear

Before You Begin

  • Allow the engine to cool completely before starting service–removing the radiator cap from a hot bike risks scalding.
  • Consider washing the radiator area beforehand to prevent dirt falling into the system.

Step 1: Remove the Radiator Cap

On the 2017 KTM 250XCW, the radiator cap is located on the top left radiator. Turn it counterclockwise and remove. This releases system pressure and allows the coolant to drain freely when you open the drain bolt.

Step 2: Locate the Coolant Drain Bolt

KTM positions the coolant drain bolt on the water pump cover. It’s an 8 mm bolt, typically identifiable by a copper sealing washer beneath the head. Place your drain pan underneath before removal–this is unique to KTM’s compact two-stroke engine layout, making it easier to access compared to some models with hidden or awkwardly placed drain locations.

Step 3: Drain the Fluid

  • Slowly remove the drain bolt and allow the old coolant to completely empty into your pan.
  • If the old coolant appears rusty, milky, or contains debris, inspect system parts like hoses and the water pump for further issues.
  • For a complete flush, you may tip the bike slightly side-to-side, ensuring all old fluid exits both radiators.

Step 4: Re-Install the Drain Bolt

  • Clean the drain bolt and inspect the copper washer. Replace the washer if damaged to prevent leaks. Hand-tighten, then torque to KTM’s spec if you have a torque wrench (do not overtighten).

Step 5: Add Fresh Coolant

  • Using a funnel, slowly pour your new coolant into the radiator cap opening until it’s near the top of the filler neck.
  • On the KTM 250XCW, the coolant volume is small – overfilling can cause overflow when the fluid expands during first heat cycles.
  • Gently tap the radiator hoses or squeeze them to help release trapped air.

Step 6: Bleed the System

  • With the bike upright, briefly loosen the small bleed screw on top of the right-side radiator, if equipped, to release any trapped air – a feature on most KTM XCW models.
  • Tighten the bleed screw as soon as coolant seeps out without bubbles.

Step 7: Recheck and Test-Run

  • Replace the radiator cap and start your bike. Let it run briefly, then shut down and allow it to cool. Check coolant level again and top off if necessary.
  • Inspect all bolts and hoses for leaks before your next ride.

Model-Specific Notes for the 2017 KTM 250XCW Owner

  • This model uses KTM’s advanced TPI (Transfer Port Injection) cooling circuit, designed for precise combustion temperatures–always use the recommended coolant type to maintain injector and cylinder lifespan.
  • Factory radiator guards can slightly obstruct access to the cap or drain bolt–remove guards if needed for easier reach.
  • If you regularly ride in harsh conditions or mud, inspect radiator fins and T-pipe for clogs, as overheating is more likely if airflow is restricted or coolant flow is impeded.
  • Never mix coolant types; always thoroughly drain the system if switching formulas to avoid gelling or reduced protection.

With these steps and model-specific tips, you can confidently service your 2017 KTM 250XCW’s cooling system and enjoy reliable, safe performance on every ride.

Related Shopping Categories

Shop Radiators for a 2017 KTM 250XCW Dirt Bike.

Shop Coolant for a 2017 KTM 250XCW Dirt Bike.

Shop Temperature Sensors for a 2017 KTM 250XCW Dirt Bike.

Shop Tools for a 2017 KTM 250XCW Dirt Bike.

Shop Radiator Hoses for a 2017 KTM 250XCW Dirt Bike.

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.