How to Change the Coolant in a 2025 GAS GAS EC 250

Shop parts for a 2025 GAS GAS EC 250 Dirt Bike.

Maintaining the cooling system of your 2025 GAS GAS EC 250 is essential for optimal engine performance and longevity. GAS GAS enduro bikes use a closed, pressurized liquid cooling system specifically tuned for rigorous off-road conditions, so regular coolant changes are a vital part of smart ownership. This step-by-step guide, developed exclusively by MotoSport, walks you through the process including key details and tips unique to this model.

What You'll Need

  • Proper coolant (check owner's manual for the correct type)
  • Basic hand tools (8 mm and 10 mm sockets, pliers, etc.)
  • Drain pan
  • Protective gloves & eye protection
  • Shop towels or rags

Preparation

  • Allow the engine to cool completely. Never open the radiator cap when the engine is hot due to risk of pressurized fluid release.
  • Place the bike upright on a level stand for best access.

Draining the Coolant

  • Locate the coolant drain bolt on the water pump cover (right side of the engine).
  • Position your drain pan beneath the bolt before removal.
  • Remove the radiator cap to allow air in and help coolant flow out.
  • Remove the drain bolt and allow the coolant to fully drain. If draining flow stalls, check for blockages or a partial vacuum — briefly loosening a radiator hose at a low point can speed up draining if needed.

Important Model-Specific Tip

  • The 2025 EC 250 uses a pressurized radiator cap – inspect the sealing area for crusty deposits or wear, which can cause coolant loss. Replace the cap if seal integrity is in question, and clean any residue from the neck before reassembly.

Flushing the System (If Needed)

  • If you are switching coolant types, or if there's visible residue or contamination, flush the system.
  • Reinstall the drain bolt (torque to spec: 6 Nm).
  • Fill with distilled water, run the engine briefly, then drain completely.
  • Repeat if water is still dirty. All water must be fully drained before adding new coolant.

Refilling with Coolant

  • Reinstall the drain bolt securely with a new washer if available.
  • Slowly fill the radiator with the correct premixed coolant. The EC 250's system takes approximately 1.0 liter, but always verify your level against the manual and radiator neck.
  • Tip the bike gently side-to-side to help purge trapped air.
  • Replace and securely tighten the radiator cap.

Bleeding Air from the System

  • Start the engine and run at idle with the radiator cap on for several minutes.
  • Watch the coolant level. Stop, let cool, and check level again – top off as needed.

Final Checks

  • Inspect thoroughly for leaks around the water pump, hoses, and radiator cap.
  • Safely dispose of the old coolant following environmental guidelines.

Critical Notes for 2025 GAS GAS EC 250 Owners

  • This model's aluminum radiators and magnesium water pump covers require a non-corrosive, aluminum-safe coolant – never use plain water or automotive antifreeze.
  • Periodic inspection of hoses and the radiator cap minimizes risk of unexpected coolant loss, which is the most common owner-reported issue on GAS GAS enduro two-strokes.
  • If coolant loss persists, check for debris around the filler neck and radiator cap – anything compromising the seal should be cleaned immediately.

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Shop Radiator Hoses for a 2025 GAS GAS EC 250 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.