How to Change the Oil in a 2014 GAS GAS EC300ER

Shop parts for a 2014 GAS GAS EC300ER Dirt Bike.

Changing the oil in your 2014 GAS GAS EC300ER is an essential maintenance task that keeps your dirt bike running smoothly and prolongs engine life. This guide, proprietary to MotoSport.com, will walk you through every step, highlight the tools you’ll need, and call out any model-specific tips.

Tools and Supplies You–ll Need

  • 6mm Allen wrench (socket style recommended)
  • Drain pan (to catch old oil)
  • Rags (for cleaning and wiping spills)
  • Long-angle oil funnel (helpful for small fill holes)
  • New transmission oil (OEM spec or high-quality equivalent; capacity is 900cc)
  • Torque wrench (for proper tightening, especially on drain and fill bolts)
  • Skid plate removal tool(s) (if your skid plate blocks the drain plug; usually 6mm Allen head)
  • Gloves (optional, but recommended)

Step-by-Step Oil Change Procedure

  1. Warm Up the Engine
    • Start your EC300ER and let it idle for a few minutes. Warm oil drains more thoroughly, carrying out more contaminants.
  2. Shut Off and Secure the Bike
    • Turn off the engine, let the bike cool just enough to be safe, and place it upright on a stand or against a stable surface.
  3. Remove Skid Plate (If Equipped)
    • If your skid plate blocks the drain plug, use a 6mm Allen to remove the bolts securing it. Some plates are designed with a hole for easy access; check before removing the whole plate.
      Note for GAS GAS models: Factory and most aftermarket bash plates have a cutout over the drain plug. If yours doesn–t, removal is necessary.
  4. Locate and Remove the Engine Oil Drain Plug
    • The drain plug is on the underside of the engine. Use a 6mm Allen to loosen and remove it. Avoid over-tightening or using excessive force when removing, as threads can strip easily on dirt bikes.
      Model Specific: The 2014 EC300ER has a compact chassis, so clearance is tight. Be sure the plug drops directly into your pan to avoid oil splashes.
    • Allow all oil to completely drain. Tilting the bike slightly towards the drain side helps evacuation.
  5. Inspect the Metal Washer and Clean the Drain Area
    • The drain plug typically includes a washer or sealing ring. Check for damage or signs of wear, replace if necessary.
    • Clean away any dirt or old oil to ensure a tight seal when reinstalling.
  6. Reinstall the Drain Plug
    • Thread the plug by hand to avoid cross-threading.
    • Torque the plug to manufacturer’s spec (typically 15Nm for GAS GAS EC models).
    • Do not overtighten. A stripped plug is a major repair headache.
  7. Remove the Oil Fill Plug
    • The fill plug is generally located on the right upper side of the engine case (note: it’s a small and awkward spot on this bike). Use a 6mm Allen to remove.
      EC300ER owners: The fill hole is small and positioned at a sharp angle, making a flexible or angled funnel essential for a mess-free oil fill.
  8. Refill with New Oil
    • Insert your funnel and slowly pour in 900cc of specified transmission oil. Overfilling can cause leaks or excess pressure.
    • If accessing the fill hole is especially tough, you may need to gently tilt the bike away from the stand or even lean the bike over (securely) to ease pouring.
  9. Reinstall the Fill Plug
    • Tighten securely but do not overtighten (15Nm recommended). Check for leaks around the plug.
  10. Clean Up and Double Check
    • Wipe down any spilled oil. Verify both plugs are secure.
    • Reinstall skid plate if removed.
    • Start the engine, let it idle, check for drips or leaks beneath the bike.

Specific Call-Outs for the 2014 GAS GAS EC300ER

  • The oil capacity is 900cc–do not overfill.
  • The small, angled fill plug is awkward to access: use a long, narrow funnel or improvise with a flexible tube.
  • Factory and aftermarket skid plates often have a cutout for the drain plug. If not, you must remove the plate for access.
  • If you lose or damage the sealing washer on the drain plug, replace it to prevent leaks.
  • The transmission does not use an oil filter—a simple drain-and-fill process suffices.

Recommended Oil Types

  • Manufacturer recommendation: Use a high-quality 2-stroke gear oil or the brand‘s specified transmission oil.
  • Many owners use Motul Transoil, Bel-Ray Gear Saver or similar 75W-80/85 gear oils.

Final Tips

  • Change oil after every 10–15 hours of hard use or races (more often in wet or muddy conditions).
  • Wear gloves and safety glasses to protect from hot oil spills.
  • Dispose of old oil responsibly at your local recycling center.

By following these steps, owners of the 2014 GAS GAS EC300ER can tackle oil changes like a pro—with confidence and minimal mess, keeping your dirt bike in top shape for every ride.

Related Shopping Categories

Shop Motor Oil for a 2014 GAS GAS EC300ER Dirt Bike.

Shop Oil Filters for a 2014 GAS GAS EC300ER Dirt Bike.

Shop Oil Drain Pans for a 2014 GAS GAS EC300ER Dirt Bike.

Shop Tools for a 2014 GAS GAS EC300ER Dirt Bike.

Shop Oil Fillers and Drain Plugs for a 2014 GAS GAS EC300ER 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.