How to Change the Oil in a 2009 GAS GAS EC 300: A MotoSport.com Guide

Shop parts for a 2009 GAS GAS EC 300 Dirt Bike.

Maintaining your 2009 GAS GAS EC 300 with regular oil changes keeps your two-stroke dirt bike running at peak performance and protects its transmission and clutch. This guide covers everything you need to know—tools, step-by-step instructions, oil quantity, and model-specific tips—to ensure a straightforward and proper oil change.

Tools and Supplies Needed

  • 6mm Allen socket or Allen wrench (for drain and fill plugs)
  • Socket wrench
  • Drain pan
  • Measuring cup or graduated oil jug (for accurate oil refill, 900cc/0.95 quarts capacity)
  • Replacement transmission oil (consult your owner's manual—quality 10W-40 or 75W transmission oil recommended)
  • Paper towels or shop rags
  • Brake cleaner (optional, for cleaning drains and magnetic plug)
  • Small funnel (helps with small fill plug opening)

Model-Specific Call-outs for the 2009 GAS GAS EC 300

  • Oil Capacity: The bike holds 900cc (0.95 quarts) of oil in the transmission—do not overfill.
  • Drain Plug Placement: Located on the bottom of the engine. If you have a factory or aftermarket skid plate, you may need to remove it or locate the access hole drilled for the drain plug.
  • Magnetic Drain Plug: The stock plug is aluminum and magnetic, designed to capture metallic debris from the clutch and gearbox.
  • Tight Fill Plug: The transmission oil fill plug is on the right side of the engine and is small—using a small funnel makes pouring easier and cleaner.
  • No Oil Filter: As a two-stroke, the EC 300 does not have a replaceable oil filter, simplifying the job.

Step-by-Step Oil Change Instructions

  1. Warm Up the Bike
    • Start and idle the engine for 2–3 minutes—this warms the oil and helps debris suspend, making it easier to drain completely.
  2. Position the Bike and Prepare
    • Secure the bike upright on a stand or flat ground.
    • Lay down newspaper or cardboard to catch any spills.
    • If equipped, remove the skid plate (usually two bolts with a 6mm Allen), or ensure you can access the drain plug through its access hole.
  3. Remove the Drain Plug
    • Place your drain pan beneath the engine.
    • Use the 6mm Allen to loosen and remove the drain plug at the bottom of the transmission case.
    • Allow all oil to fully drain out—springs, shavings, or metal particles on the plug are normal but clean the magnet thoroughly.
    • Inspect the aluminum drain plug for wear and clean it with a paper towel or brake cleaner.
  4. Replace the Drain Plug
    • Once oil stops dripping, reinstall the cleaned drain plug by hand, then snug with the 6mm Allen wrench. Do not over-tighten;— the aluminum threads can strip easily.
  5. Add New Oil
    • Remove the fill plug (right side of engine) with your Allen wrench.
    • Slowly pour exactly 900cc (0.95 quarts) of fresh transmission oil using your graduated container and a small funnel.
    • The fill opening is small and awkward; leaning the bike slightly away from the fill side can help aim the pour.
    • Replace the fill plug and hand-tighten.
  6. Check for Leaks & Test
    • Wipe down any spills or residue, then start the bike briefly to circulate the new oil.
    • Turn off and check for leaks at both drain and fill plugs.
    • Reinstall the skid plate if removed.
  7. Dispose of the Old Oil Properly
    • Pour the used oil into a suitable container and take it to a recycling center or auto parts store that accepts motor oil.

Troubleshooting & Tips

  • If the fill port is exceptionally tight or blocked by exhaust guards, use patience and the smallest funnel you have.
  • If you notice excess metallic debris on the magnetic plug (more than just a fine paste), check for transmission or clutch issues.
  • Always double-check the oil level sight glass if equipped (some years/models differ) after running the bike for a minute and topping up as needed.
  • Keep track of oil change intervals—fresh oil makes clutch action smoother and reduces gear wear.

Conclusion

Changing the oil in your 2009 GAS GAS EC 300 is a quick, essential job that requires minimal tools and mechanical experience. Follow the steps, watch out for model-specific quirks (notably the snug fill hole and 900cc capacity), and enjoy a smoother-shifting and longer-lasting bike. For all your dirt bike oils and parts, trust MotoSport.com. Ride on.

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Shop Oil Fillers and Drain Plugs for a 2009 GAS GAS EC 300 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.