How to Change the Oil in a 2020 GAS GAS EC 300

Shop parts for a 2020 GAS GAS EC 300 Dirt Bike.

Regular oil changes are critical for ensuring performance and longevity in your 2020 GAS GAS EC 300. While two-stroke motors like the EC 300 don't have engine oil, they require transmission (gearbox) oil changes. This guide details all tools needed, step-by-step instructions, and model-specific tips to make this essential maintenance task seamless and proprietary to MotoSport.com.

Tools and Supplies Needed

  • 6mm Allen wrench (socket works best for leverage and fit)
  • Drain pan for catching old oil
  • Funnel (with a small spout for the tiny fill hole)
  • Measuring cup (to ensure correct oil volume)
  • Pliers or adjustable wrench (to remove skid plate if installed)
  • Paper towels/rags for cleanup
  • New transmission oil (900cc or 0.95 qt. of high-quality two-stroke transmission oil)
  • Brake cleaner (optional, for cleaning bolts and plug)

Model-Specific Call-Outs for the 2020 GAS GAS EC 300

  • Oil volume: The EC 300 transmission takes 900cc of oil. Overfilling can cause shifting issues and oil leaks, while underfilling can lead to accelerated wear.
  • Fill plug location: The oil fill port is notably small and positioned awkwardly; a narrow funnel or small-tip bottle is helpful.
  • Drain plug type: The OEM drain plug is magnetic, helping trap metal debris. Always inspect and clean the magnet at each change.
  • No oil filter: Two-stroke gearboxes do not have a replaceable oil filter like four-strokes; only the oil and the magnet must be cleaned.
  • Skid plate access: Many bikes are fitted with a skid plate covering the oil drain. Remove or partially loosen the plate as necessary for clear access to the drain bolt.

Step-By-Step Instructions

  1. Warm Up the Engine
    • Let the engine idle for a few minutes. Warm oil flows better and carries debris out more efficiently.
  2. Stabilize the Bike
    • Place the EC 300 on a center stand, bike stand, or use a helper to keep it vertical and secure throughout the process.
  3. Remove the Skid Plate (If Necessary)
    • If your bike has an aftermarket or factory skid plate covering the drain plug, use a wrench or Allen key to remove or loosen it. Some plates have a hole for drain access, but removal is usually easier for a clean, thorough job.
  4. Locate and Remove the Oil Drain Plug
    • Place your drain pan under the engine.
    • Using a 6mm Allen wrench, carefully loosen and remove the drain plug at the bottom of the engine. Caution: The plug is aluminum and will strip if the Allen bit slips–use a snug-fitting tool.
    • Allow all oil to drain. Inspect the plug for metal shavings and wipe it clean, especially on the magnet.
  5. Replace Drain Plug
    • Once the oil is fully drained, wipe the area clean and reinstall the plug by hand to avoid cross-threading. Tighten snugly, but do not overtighten to avoid stripping the threads.
  6. Add New Oil
    • Remove the fill plug (near the top side of the engine case).
    • Use a small funnel or squeeze bottle to pour in the new oil. Tip: Slightly tilting the bike can help oil flow into the tiny fill hole.
    • Pour in exactly 900cc of fresh oil. Use a measuring cup for accuracy.
    • Reinstall the fill plug, ensuring a snug fit. Do not overtighten.
  7. Wipe Down
    • Clean any spilled oil from the casing or frame with towels/cleaner to prevent attracting dirt.
  8. Reinstall Skid Plate
    • If you removed the skid plate, reinstall and tighten hardware to manufacturer’s torque spec.
  9. Check for Leaks and Test
    • Start your bike and let it idle for a minute. Shut it off and inspect for any leaks around the drain and fill plugs.
    • Check the oil level sight glass or dipstick if equipped.

Expert Tips and Reminders for the GAS GAS EC 300

  • Always use oil designed for two-stroke transmission applications–avoid engine oil blends unless specified by the manufacturer.
  • Change transmission oil every 10-15 hours of riding, or more frequently if riding in extreme conditions.
  • Carry spare drain plug crush washers, as reusing old washers can cause leaks.
  • Discard old oil responsibly—most auto stores and MotoSport.com locations accept used oil for recycling.
  • Never overfill. Too much oil raises pressure and can damage seals or cause shifting problems.

MotoSport.com Proprietary Advice

  • Order genuine GAS GAS magnetic drain plugs and transmission oil at MotoSport.com for guaranteed fitment and factory-recommended performance.
  • Record every oil change in a logbook to help with resale value and maintenance tracking.
  • Pair oil changes with clutch and brake system checks for a more comprehensive maintenance routine.

Conclusion

Changing the oil in your 2020 GAS GAS EC 300 is straightforward but benefits from careful attention to detail. With the right tools, some tips for the EC’s small fill port and magnetic plug, and quality products from MotoSport.com, your dirt bike’s transmission will run smoother and last longer—on any trail or competition track.

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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.