How to Change the Oil in a 2014 GAS GAS EC 300

Shop parts for a 2014 GAS GAS EC 300 Dirt Bike.

Changing the transmission oil in your 2014 GAS GAS EC 300 is a straightforward but essential maintenance task. This procedure keeps your clutch and gearbox running smoothly, helps detect internal wear, and extends your dirt bike’s life. Below, MotoSport.com gives you a comprehensive, model-specific guide, including all tools needed and important ownership call-outs.

Tools and Materials Needed

  • 6mm Allen socket or Allen wrench (for drain and fill plugs)
  • Oil catch pan
  • Paper towels or shop rags
  • New transmission oil (900cc/0.95 US qt; consult your manual for oil type recommendation–premium 2-stroke transmission oil or Motorex Gear Oil 10W/40 is a common choice)
  • Small funnel (optional, recommended due to small fill hole)
  • Torque wrench (recommended for reinstalling the drain plug)
  • Magnetized drain plug cleaner or clean rag
  • Brake cleaner (optional for cleaning)
  • Skid plate removal tools (if your bike is fitted with an after-market or factory skid/glide plate)

Preparation

  • Warm up the bike: Run the engine for 2–3 minutes to thin out the old oil for better drainage. This also helps break loose any debris.
  • Stabilize your bike on a stand, ensuring it’s level and secure before starting work.
  • If you have a skid plate, remove it for easy access to the drain plug. Most plates are secured by a few Allen bolts. Factory plates have holes for drain plug access, but after-market plates may require full removal for best results.

Step-by-Step Guide

  1. Locate the drain plug:
    • On the bottom of the engine case, slightly rearward–look for a 6mm Allen drain plug. The drain bolt on the EC 300 is magnetic, designed to catch metal shavings from the clutch and gear wear. Be careful not to strip this aluminum plug. Tip: Use a high-quality socket-style Allen for a proper fit and to avoid damage.
  2. Place the oil catch pan:
    • Position a container beneath the engine to catch the draining oil. Lay some rags or paper towels around as well, since access is a bit tight and it can get messy.
  3. Remove the drain plug:
    • Turn the drain plug counterclockwise. Allow all oil to drain completely. For more thorough draining, you can gently tip the bike to its side–just be careful to avoid spills and overbalancing. Optional: Hold down the kill button and turn over the engine a few times (with no spark) to “pump” out more residual oil.
  4. Clean and inspect the drain plug:
    • Wipe the magnetic tip with a shop towel. Some fine metal dust is normal, but excessive debris may signal transmission or clutch wear. Clean thoroughly and inspect the drain plug’s washer or O-ring for wear or damage; replace if needed.
  5. Reinstall the drain plug:
    • Once all oil is drained, reinstall the drain plug. Hand-tighten and then torque to manufacturer specs. Do not overtighten the aluminum plug.
  6. Remove the fill plug:
    • The fill plug is located on the right side of the engine casing and can be awkwardly small to access.
    • It is best to use a small funnel for pouring the new oil due to the fill hole’s small size.
  7. Add new oil:
    • Pour in 900cc (0.95 US quart) of 2-stroke-specific transmission oil through the fill hole. Use a funnel to avoid spills. Do not overfill.
  8. Replace the fill plug:
    • Tighten the fill plug snugly but do not overtighten as the threads are soft aluminum.
  9. Check for leaks:
    • Start the bike, let it idle for a minute, then turn off and check for any leaks at the drain and fill plugs.
    • Wipe away any excess oil and clean up your workspace.
  10. Dispose of the used oil properly:
    • Recycle the old oil at an appropriate facility. Never dump oil onto the ground.

2014 GAS GAS EC 300 Specific Call-Outs

  • No oil filter required: This model, as with most two-strokes, does not use an oil filter for transmission oil, so there is no oil filter to change.
  • Fill plug accessibility: The fill hole is notoriously small—take your time pouring and use a clean funnel to avoid contamination and messy spills.
  • Magnetic drain plug: Periodically inspect for excessive debris; normal to see some metallic fuzz, especially after new clutch plates.
  • Skid plate issues: Factory plates have drain access holes, but most after-market or race skid plates may require complete removal for easiest access and to avoid making a mess.
  • Oil amount and type: 900cc of modern, high-quality 2-stroke transmission oil is correct; using less or more may affect shifting and clutch action.

Pro Tips from MotoSport.com

  • Change your transmission oil after every 10–15 hours of hard riding, or sooner after deep water crossings or racing.
  • Label your next oil change in a logbook so you never forget. Stay ahead on maintenance for long engine life and reliable performance.
  • Always work with a cold engine if you’re not comfortable with hot oil, but remember that warm oil drains better.

Follow this guide from MotoSport.com to keep your 2014 GAS GAS EC 300 shifting smoothly and ready for wherever the trail takes you.

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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.