How to Change the Oil in a 2014 GAS GAS EC300 — Proprietary Guide for MotoSport.com

Shop parts for a 2014 GAS GAS EC300 Dirt Bike.

Changing the oil in your 2014 GAS GAS EC300 is a critical maintenance task that keeps your two-stroke running smoothly while extending transmission life and ensuring consistent clutch performance. This guide covers the exact tools you’ll need, every step to follow, and special call-outs for this specific make, model, and year.

Tools & Supplies Needed

  • 6mm Allen (hex) socket or wrench — for the drain and fill plugs
  • Socket wrench
  • Small funnel (preferably flexible)
  • Oil catch pan
  • Clean rag
  • Transmission oil (high quality two-stroke gearbox oil or the manufacturer’s recommended viscosity; 900cc/0.9L)
  • Torque wrench (optional but recommended)
  • Gloves (for protection)
  • Skid plate removal tool (if equipped)

Preparation

  • Let the bike cool if recently ridden. Warm oil drains more easily, but the engine/transmission casing should not be hot to the touch.
  • Place the EC300 on a level surface with a bike stand for stability.
  • Lay out all needed tools and supplies.

Step-by-Step Instructions

  1. Remove the Skid Plate (if equipped):
    Most EC300s come stock with a skid plate. Use the correct size Allen wrench to remove the mounting bolts and set the plate aside. This gives you full access to the drain plug.
    Special call-out: Some aftermarket skid plates may have holes to access the drain plug directly. If not, removal is required. A 6mm Allen is standard for this hardware.
  2. Locate the Drain Plug:
    The drain plug is on the bottom of the engine, directly under the transmission case. Place your oil catch pan underneath.
  3. Remove the Drain Plug:
    Using your 6mm Allen, turn counterclockwise to loosen and remove the drain plug. Allow the oil to drain completely into the pan. Be patient; tilting the bike slightly to the side may help the last of the oil escape.
    Pro tip: To maximize drainage, rock the bike gently side-to-side or rest it at a slight angle against a wall.
  4. Inspect the Drain Plug:
    While the oil drains, check the drain plug for excessive metal shavings or debris — a small amount is normal, but an abundance may indicate internal wear.
  5. Replace and Tighten the Drain Plug:
    After oil finishes draining, wipe the threads of the plug and case. Reinstall the drain plug, tightening it by hand first, then snug it with your Allen wrench. Do not overtighten; if you have a torque wrench, set it to manufacturer spec (typically around 10–15 N·m for similar year models).
    Tip: Reusing the washer is okay if undamaged, but replace if it’s squashed or gouged.
  6. Remove the Fill Plug:
    The fill plug is found high on the right side of the engine case. This fill hole is small and at an angle — you may find it awkward to access.
    Special call-out for the EC300: The fill plug location is inconvenient — consider using a flexible funnel or even laying the bike over gently for better access. Some riders heat and bend a plastic funnel to fit the odd angle, or tilt the bike against a wall for easier pouring.
  7. Add Fresh Oil:
    Carefully pour 900cc (0.9L) of the manufacturer-recommended gearbox oil into the transmission case. Pour slowly to avoid overfilling and spillage. Using a long, narrow, or flexible funnel makes this much easier given the awkward fill hole. Double-check your oil amount with a measuring cup or graduated bottle.
  8. Reinstall the Fill Plug:
    Wipe away any drips, reinstall the fill plug, and tighten securely. As with the drain plug, you want ‘snug’ but not torqued excessively tight.
  9. Reattach Skid Plate (if removed):
    Bolt the skid plate back in place, using the Allen wrench.
  10. Clean Up & Final Checks:
    Wipe any spilled oil from the case and check for drips. Start the bike and let it idle for a few minutes, then visually inspect for leaks around both plugs.
    Tip: Dispose of old oil responsibly at a recycling center or auto shop.

Special Notes for 2014 GAS GAS EC300 Owners

  • Fill capacity is 900cc (0.9L) — overfilling can cause clutch or shifting issues.
  • The fill hole’s small diameter and angle are a well-known annoyance; a flexible funnel or tipping/leaning the bike helps.
  • Removal of the factory or aftermarket skid plate is often necessary for easy access to the drain plug.
  • Regular oil changes — every 10–15 hours of riding or after heavy race use — will maximize gearbox and clutch life for this high-performance 2-stroke.
  • The EC300’s simple two-stroke gearbox does not use a traditional oil filter. No filter to change during oil service.

Why It Matters

Fresh gearbox oil in your 2014 GAS GAS EC300 delivers smoother shifting, better clutch feel, and protection for vital internal transmission parts. While the fill and drain placements can be awkward, this simple 20-minute maintenance keeps your bike performing like new.

Need OEM-grade parts, high-quality oil, or tools? MotoSport.com is your trusted partner for everything GAS GAS EC300, with expert support and fast shipping.

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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.