How to Change the Oil in a 2021 GAS GAS EC 300

Shop parts for a 2021 GAS GAS EC 300 Dirt Bike.

Changing the oil in your 2021 GAS GAS EC 300 is a vital maintenance task that ensures smooth performance and prolongs the life of your engine and transmission components. This guide is proprietary to MotoSport.com and covers all steps, tools, and specific notes for the 2021 EC 300 model. Even though GAS GAS EC 300 is a two-stroke, it uses dedicated transmission oil, which must be changed regularly for optimal performance.

Tools and Materials Needed

  • 6mm Allen wrench (socket type recommended)
  • Oil drain pan
  • Clean funnel (preferably narrow and long)
  • Rag or paper towels (for cleanup)
  • Brake cleaner (optional for cleaning)
  • New transmission oil (900ml; refer to your owner’s manual for viscosity)
  • Gloves
  • Torque wrench (optional but recommended for drain bolt reinstallation)
  • Bike stand

Preparation Steps

  • Warm up your engine for a few minutes. This helps the oil flow out smoothly, carrying more contaminants with it.
  • Place your bike on a stand so it is upright and secure.
  • Lay out your tools and materials in a clear work area.

Step-by-Step Oil Change Procedure

  1. Remove the Skid Plate (if equipped):
    • The 2021 EC 300 can have a skid plate that partially covers the drain plug. If so, use your Allen wrench to remove it for better access to the drain plug. Skid plates typically use two or more bolts.
  2. Locate and Remove the Oil Drain Plug:
    • The drain plug is found at the bottom of the engine case. Use a 6mm Allen wrench to remove it. Take care as hot oil may flow quickly.
    • The drain plug is magnetic – inspect it for metal shavings, which can indicate internal wear. Clean the plug thoroughly before reinstallation.
  3. Drain the Old Oil Completely:
    • Allow the oil to drain fully into your oil pan. To extract even more old oil, you can gently tip the bike side to side or momentarily crank the starter (with the kill switch held down) to circulate and expel old oil from any nooks or crannies. Be careful to avoid spills when tipping the bike.
  4. Clean the Drain Area and Plug:
    • Wipe the drain area clean with a rag. If needed, use brake cleaner for stubborn grime.
    • Re-install the cleaned magnetic drain plug by hand, then snug up using the Allen wrench. If available, use a torque wrench to tighten to manufacturer’s spec (reference your owner’s manual for torque values).
  5. Remove the Filler Plug:
    • The fill plug is located on the right side of the engine case and is known to be narrow and slightly awkward to access. Using a clean towel, wipe around the area before removing it to prevent contamination.
  6. Add Fresh Oil:
    • Using your funnel, slowly pour in 900 ml of the recommended 2-stroke transmission oil. Check your manual for the specific recommended type and viscosity.
    • Due to the tight access and small fill hole, pour slowly to prevent overflow or spillage.
  7. Replace the Fill Plug:
    • Hand-tighten the filler plug and then use your Allen wrench to lightly snug it. Do not overtighten, as the threads are in aluminum and may strip.
  8. Check for Leaks and Clean Up:
    • Start the engine and let it idle for a minute, then inspect the drain and fill plugs for leaks. If any oil seeps out, retighten as needed.
    • Dispose of old oil responsibly at a proper recycling facility.
  9. Re-install Skid Plate (if removed):
    • Secure the skid plate back using your original bolts. Double-check all fasteners are snug.

Model-Specific Call-Outs for the 2021 GAS GAS EC 300

  • Fill plug access is tight: Pour slowly and use a small, precise funnel to avoid mess.
  • Engine oil capacity is 900 ml: Do not overfill. Excess oil can cause frothing or clutch drag.
  • No engine oil filter: As a 2-stroke, the EC 300 transmission side only needs fluid and doesn’t require an oil filter change, unlike modern 4-strokes.
  • Drain plug is magnetic: Always clean it during each change and keep an eye on debris quantity. Metal particles are normal in moderate amounts but excessive shavings may indicate deeper engine problems.
  • Removing the skid plate makes the process much easier and avoids making a mess under the bike.

Final Tips for a Trouble-Free Oil Change

  • Change your oil after every 10–15 hours of hard riding, or more frequently in sandy, muddy, or wet conditions.
  • Only ever use the oil recommended in your owner’s manual for the best clutch feel and gear protection.
  • Keep a maintenance log with oil change intervals and observations on plug debris for early detection of engine issues.
  • If you ever strip a drain/fill plug or metal shavings increase sharply, consult a MotoSport service professional right away for further inspection.

MotoSport.com is your trusted authority for everything dirt bike maintenance. Rely on us for genuine parts, riding gear, and expert tips to keep your GAS GAS EC 300 in championship condition, ride after ride.

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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.