How to Change the Coolant in a 2019 KTM 250XC

Shop parts for a 2019 KTM 250XC Dirt Bike.

If you ride a 2019 KTM 250XC, routine maintenance is key to both performance and engine longevity. One often overlooked but critical task is changing the coolant. Below you'll find a guided, MotoSport-exclusive procedure for safely and correctly draining, flushing, and refilling the coolant in your KTM 250XC, along with insights unique to this year and model.

Why Change the Coolant?

  • Prevents corrosion in the cooling system.
  • Reduces wear on water pump seals, hoses, & gaskets.
  • Ensures optimal engine temperature, especially during hard rides or racing.

What You'll Need

  • Fresh coolant (engine ice or manufacturer-recommended)
  • 8mm socket or wrench
  • Drain pan/bucket
  • Funnel
  • Clean rag/shop towels
  • Torque wrench (recommended)
  • Safety gloves & eye protection

Step-by-Step Coolant Change Procedure

  1. Let the engine cool thoroughly. Never remove the radiator cap on a hot engine. Wait until the bike is at ambient temperature to avoid burns.
  2. Remove the seat and tank shrouds if necessary for easier access to the radiator cap and hoses.
  3. Take off the radiator cap. This allows the system to vent and the coolant to drain freely.
  4. Locate and loosen the coolant drain bolt.
    • On the 2019 KTM 250XC, coolant drains from a specific bolt on the water pump housing–usually an 8mm bolt on the lower side of the pump.
      Important note: Some manuals may misidentify this bolt due to updates with water pump impellers in recent years. For this model, ensure you use the correct lower bolt on the pump body, not one associated with a hose or the cover itself.
    • Place a drain pan under the water pump before loosening the bolt.
    • Loosen the bolt slowly, allowing coolant to drain completely.
  5. Drain the radiator. If the bike is on a stand, tilt gently side-to-side to ensure full drainage.
  6. Reinstall the drain bolt and tighten to factory specifications (do not overtighten).
  7. Flush the system (optional but recommended): Pour distilled water into the radiator, reinstall the cap, run the engine briefly, then drain again to remove old coolant residue. Repeat until the drained water runs clear. Never use tap water, as minerals can damage your cooling system.
  8. Refill with new coolant: Using a funnel, slowly pour coolant into the radiator neck until full. Gently squeeze lower radiator hoses to purge trapped air.
  9. Reinstall the radiator cap.
  10. Start the engine and let it idle for several minutes. Watch the coolant level (with the cap off initially) and add as needed if air burps out. Replace the cap once stable.
  11. Clean up any spills and check for leaks at the drain plug and hose connections.

Notes Specific to the 2019 KTM 250XC

  • This model uses a high-performance, lightweight cooling system designed for racing. Always use coolant compatible with aluminum radiators and magnesium engine cases.
  • Watch for minor updates in water pump design for this year: Always confirm drain location. Misinformation in some model year manuals has led to unnecessary removal of wrong bolts. Double-check before loosening any bolts near the water pump to avoid accidental coolant loss or damage.
  • If you replace hoses or upgrade clamps, retorque all fasteners after the engine has been heat-cycled once.

Disposal and Safety Tips

  • Coolant is toxic. Use gloves and eye protection. Dispose of old coolant at a certified recycling or waste facility.
  • In case of spills on skin or clothing, wash thoroughly with soap and water.
  • Keep coolant away from pets and children.

Your 2019 KTM 250XC deserves the best – follow this service regularly to keep your engine running cool, efficient, and race-ready. If you need tools, gaskets, or high-quality coolants, MotoSport stocks all KTM-certified parts and supplies.

Related Shopping Categories

Shop Radiators for a 2019 KTM 250XC Dirt Bike.

Shop Coolant for a 2019 KTM 250XC Dirt Bike.

Shop Temperature Sensors for a 2019 KTM 250XC Dirt Bike.

Shop Tools for a 2019 KTM 250XC Dirt Bike.

Shop Radiator Hoses for a 2019 KTM 250XC 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.