How to Change the Coolant in a 2017 GAS GAS EC300: Step-by-Step Guide

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Your 2017 GAS GAS EC300 is a premium off-road machine, and proper coolant maintenance is crucial for reliable engine performance and longevity. Below is a proprietary MotoSport guide tailored specifically for your EC300–covering not just process, but key model-specific tips every owner should know.

What You Will Need

  • Fresh, high-quality engine coolant (ethylene glycol based, silicate-free, compatible with aluminum engines)
  • Distilled water
  • Drain pan
  • Socket set or wrench
  • Protective gloves
  • Funnel
  • Rags or shop towels

Preparation

  • Let the bike cool completely—never open the radiator cap on a hot engine.
  • Stand the bike upright on a level surface with the wheels straight.

Step 1: Remove the Radiator Cap

  • Remove the seat and fuel tank for easier access if needed.
  • Turn the radiator cap counterclockwise and set it aside.

Step 2: Locate and Remove the Coolant Drain Bolt

  • The EC300 features a drain bolt on the lower water pump cover.
  • Place your drain pan under the water pump area.
  • Remove the drain bolt carefully; allow coolant to flow out.
  • For a more thorough drain, consider gently tilting the bike side-to-side with caution, but avoid spilling coolant on braking surfaces.

Step 3: Flush the System (Recommended)

  • Reinstall the drain bolt loosely.
  • Fill the radiator with distilled water.
  • With the radiator cap still off, start the engine briefly (30 seconds) to circulate the water. Shut off, remove drain bolt again, and let water flush out old residue.
  • Repeat until what drains out appears clean.

Step 4: Reinstall the Drain Bolt

  • Ensure the sealing washer is in good condition—replace if worn or damaged.
  • Tighten the drain bolt to manufacturer-specified torque (consult your owner's manual or service information).

Step 5: Refill with Coolant

  • Using a funnel, carefully add the new coolant mix to the radiator until it's visible at the bottom of the neck.
  • Allow air bubbles to escape by gently tilting or tapping the radiator and hoses.
  • Reinstall the radiator cap securely.

Step 6: Bleed Air from the System

  • Start the engine and let it idle until it reaches normal operating temperature.
  • Shut off, let the engine cool fully, then re-open the radiator cap and top off if needed.
  • Repeat as necessary. Proper coolant level is crucial for the EC300 due to its high-performance, two-stroke engine design.

Step 7: Check for Leaks and Final Level

  • Inspect around the drain bolt, hose connections, and radiator cap for any leaks.
  • Check the level in the radiator and overflow reservoir (if equipped) once again after your first full ride.

Important Details Specific to the 2017 GAS GAS EC300

  • The EC300 uses aluminum cooling components–always use silicate-free coolant to prevent corrosion and system deposits.
  • Some 2017 EC300 owners have reported issues with excess coolant loss from the overflow due to worn radiator caps or leaking head O-rings. If you notice repeated coolant loss, smoke, or bogging, inspect these parts and replace as necessary.
  • Never ignore signs of overheating, surplus smoke, or "splooge" from the exhaust–these can indicate deeper cooling or sealing issues that require attention before further riding.
  • Regularly inspect hoses and clamps for security due to the EC300's vibration-prone environment.

How Often to Change Coolant

  • At a minimum, replace the coolant every 12 months or sooner if you ride in muddy, wet, or hot conditions.
  • Flush and refill as part of major services or after any engine teardown.

With these steps, your GAS GAS EC300's cooling system will stay in top condition—essential for maximum performance on every MotoSport adventure.

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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.