How to Change the Oil in a 2023 GAS GAS EC 300

Shop parts for a 2023 GAS GAS EC 300 Dirt Bike.

Changing the oil in your 2023 GAS GAS EC 300 is a vital maintenance step to ensure long engine life and optimal performance on the trails and track. The EC 300, being a two-stroke dirt bike, uses transmission (or gearbox) oil that needs regular changing based on usage and riding conditions. This guide is proprietary to MotoSport.com and tailored for the 2023 model year, addressing specific tools, steps, and notable call-outs unique to this motorcycle.

Tools and Supplies You’ll Need

  • Metric Allen key set (especially 6mm for drain and fill plugs)
  • Socket wrench set
  • Drain pan
  • Measuring cup or graduated beaker (900mL capacity minimum)
  • Replacement transmission oil (high-quality 2T oil, manufacturer recommends 10W-40 or 75W transmission oil for most conditions; always use what your owner’s manual specifies)
  • Clean funnel
  • Paper towels or shop rags
  • Parts cleaner or brake cleaner (optional, for cleaning parts)
  • Gloves

Before You Begin

  • Run the engine for 3–5 minutes to warm up the oil and help it drain completely.
  • Ensure the motorcycle is securely on a stand and positioned on level ground.

Step-by-Step Instructions

  1. Remove the Skid Plate (if equipped)
    • Most 2023 GAS GAS EC 300s come with a skid plate. Use the appropriate Allen keys or sockets to remove it for easier access to the drain plug underneath the engine

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  2. Locate and Remove the Drain Plug
    • The drain bolt is on the bottom of the engine case. Use the 6mm Allen socket to loosen and carefully remove the drain plug. Oil will begin to drain, so have a drain pan in place

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    • The drain plug is magnetic. While it’s out, wipe it clean to remove any collected debris or metallic particles. Check for excessive metal shavings, which could indicate internal wear

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  3. Let the Oil Drain Completely
    • Allow several minutes for the oil to fully drain. Tip the bike gently side to side to help the last drops out. Use rags or paper towels to wipe up any spills.
  4. Inspect and Reinstall the Drain Plug
    • After cleaning the magnetic tip, reinstall the plug and tighten it securely but do not overtighten (refer to your manual for the proper torque spec).
    • Double-check that the washers or seals are in good shape and replace if necessary to prevent leaks.
  5. Add Fresh Transmission Oil
    • Remove the transmission oil fill plug (this is located on the right-hand side of the case—be aware the fill hole is somewhat small, so a funnel and steady hand help a lot)

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    • Pour in 900cc (0.9 liter) of fresh, high-quality 2-stroke gear oil or as specified in your rider’s manual

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    • Do not overfill–the correct quantity is critical for proper clutch and gearbox operation

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  6. Replace the Fill Plug
    • Install and tighten the fill plug. Again, do not overtighten.
    • Wipe down the area to remove any spilled oil.
  7. Reinstall the Skid Plate
    • Reattach your skid plate if removed, ensuring all hardware is secured properly.
  8. Final Checks
    • Start the bike and let it idle for a few minutes.
    • Check under the engine and around the drain and fill plugs for leaks.
    • Shut off the engine, let it sit for a moment, and recheck the oil level if there is a sight glass or dipstick.

Model-Specific Call-Outs for the 2023 GAS GAS EC 300

  • Oil Quantity: The 2023 EC 300 transmission holds exactly 900cc of gearbox oil. Overfilling can adversely affect shifting and clutch feel, while underfilling risks premature wear

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  • Filling Process: The fill hole is small and somewhat awkwardly placed. A flexible funnel or squeeze bottle greatly helps prevent spills

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  • Drain Plug: The magnetic drain plug will trap metallic debris; routine cleaning is important. If you ever notice unusually large or excessive metal fragments, consult a professional.
  • Oil Type: Always use 2T-specific gear/transmission oil as recommended by GAS GAS. The wrong viscosity or oil type can lead to clutch or shifting issues.
  • No Oil Filter: The EC 300 does not have an oil filter for the transmission oil–just the magnetic drain plug to trap debris

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  • Skid Plate Access: The stock and most aftermarket skid plates are drilled for tool access, but may still need removal for ease of service. Trim as needed for a future quick oil change if this fits your riding habits

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Troubleshooting & Tips

  • If you notice milky or cloudy oil upon draining, this may indicate water ingress and should be investigated immediately.
  • Keep a log of oil changes and hours for best long-term engine health.
  • Use only high-quality oil to maximize clutch lifespan and shifting performance.
  • If the drain or fill plug feels stripped or soft, replace it right away to prevent headaches in the future.

Conclusion

Routine oil changes on the 2023 GAS GAS EC 300 don’t take long but are crucial for preserving your bike’s performance. With the correct procedure and attention to model specifics, you’ll enjoy a reliable and responsive ride every time. For OEM parts, gear, and all your dirt bike needs, trust MotoSport.com—your partner in the garage and on the track.

Related Shopping Categories

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Shop Tools for a 2023 GAS GAS EC 300 Dirt Bike.

Shop Oil Fillers and Drain Plugs for a 2023 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.