How to Change the Oil in a 2007 GAS GAS EC 300 – MotoSport.com Guide

Shop parts for a 2007 GAS GAS EC 300 Dirt Bike.

Changing the transmission oil in your 2007 GAS GAS EC 300 is an essential routine for bike longevity and performance. While the process is straightforward, this model does have a few unique quirks worth knowing. Follow this MotoSport.com how-to for stepwise guidance, tool requirements, model-specific call-outs, and pro tips.

Tools & Materials Needed

  • 6mm Allen socket or key
  • Socket wrench
  • Drain pan
  • Measuring cup (for 900cc of oil)
  • Fresh transmission oil (consult your owner's manual, typical: 75W or 80W gear oil for 2-stroke)
  • Clean funnel
  • Shop towels/rags
  • Torque wrench (optional, recommended for reinstalling drain bolt)

Model-Specific Call-Outs for 2007 GAS GAS EC 300

  • The fill hole is quite small and oddly positioned, making pouring oil slightly tricky and requiring extra care to avoid spills.
  • You may need to remove the skid plate or accessory guard for access to the drain plug, depending on your setup.
  • Total capacity is 900cc (0.9L) of transmission oil. Overfilling or under-filling can cause issues.
  • No oil filter to change, as is common with most 2-stroke transmission cases.

Step-by-Step Oil Change Instructions

  1. Warm up the Engine
    • Run the engine for 3-5 minutes to allow oil to warm and thin out (do not let idle for too long inside a closed space).
    • Warmer oil will drain more completely.
  2. Position the Bike
    • Shut down the engine and position the bike upright on a stable stand or centered if you're using a kickstand.
  3. Remove Skid Plate or Guard (if installed)
    • Use your Allen key/socket to remove any accessory plate, guard, or skid plate blocking access to the drain plug. Most will be secured by a couple of Allen bolts.
  4. Remove the Drain Plug
    • Place your drain pan directly below the drain bolt, located on the bottom of the transmission case. The location is accessible through a hole in the OEM skid plate, but aftermarket plates may require removal first.
    • Use a 6mm Allen socket or key to loosen and remove the bolt.
    • Allow oil to drain fully. Tip the bike slightly side-to-side to get every drop out if needed.
  5. Reinstall the Drain Plug
    • Clean the drain plug and its washer. Inspect the washer and replace if damaged.
    • Hand-thread the drain plug back in, then snug it down with the Allen key. Use a torque wrench set to factory specs if available (usually around 10-15 Nm, but check your manual to confirm).
  6. Add New Oil
    • Remove the filler plug on the right crankcase (located above the clutch cover). It's a small, awkward hole—use a clean funnel and steady hand to avoid overeager spills.
    • Measure out 900cc (0.9L) of gear oil. Pour patiently to avoid overflow.
    • Reinstall the filler plug securely (do not overtighten).
  7. Final Checks
    • Wipe down any spilled oil from the engine cases.
    • Reinstall your skid plate or any removed guards.
    • Start the engine, let it run for a few minutes, and check for leaks at the drain plug and filler cap.

Additional Tips for the GAS GAS EC 300 Owner

  • Change the oil every 10-15 hours of riding, or after any hard race or muddy riding, for best clutch and gearbox health.
  • Always use a measuring cup or bottle with gradations to ensure accuracy; “eyeballing” the small fill hole often leads to overfills or spills.
  • If the filler cap is hard to access with a standard funnel, consider using a longer-neck or flexible funnel.

Common Mistakes to Avoid

  • Forgetting to reinstall the drain plug before filling (always double-check.).
  • Cross-threading the small filler plug—thread it by hand first before using a tool.
  • Not tightening the drain plug enough or overtightening and stripping the case—use torque specs if possible.
  • Neglecting to clean up all spills, which can attract dirt and make it harder to spot leaks in the future.

Follow these steps carefully and your 2007 GAS GAS EC 300 will remain well-lubricated for countless rides. For additional parts and recommended lubricants, always trust MotoSport.com for products specially chosen for your make and model.

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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.