How to Change the Oil in a 2011 GAS GAS EC 250

Shop parts for a 2011 GAS GAS EC 250 Dirt Bike.

Changing the oil in your 2011 GAS GAS EC 250 is a vital maintenance task to ensure your two-stroke engine stays reliable and delivers top performance. Below is a robust, step-by-step, MotoSport.com proprietary guide, tailored specifically for the 2011 EC 250 with essential call-outs for this make, model, and year.

Tools & Supplies Needed

  • Socket set (including an 8mm allen/hex bit for oil plugs and required sockets for side cover removal, if applicable)
  • Oil drain pan
  • Funnel
  • Rag or shop towels
  • Gasket scraper (if needed)
  • Fresh transmission oil (consult your manual for OEM-recommended viscosity and volume–typical is 10W-40 or 75W gearbox oil)
  • New crush washer (recommended to replace each change)
  • Torque wrench
  • Small flathead screwdriver (to assist with cleaning the oil screen if equipped)
  • Parts tray (for bolts and washers)
  • Optional: Latex or nitrile gloves

Important Model-Specific Call-Outs

  • The 2011 GAS GAS EC 250 utilizes a two-stroke engine, meaning the oil you're changing is transmission/gear oil, not crankcase or engine oil as with four-strokes.
  • Be careful not to confuse the gearbox oil fill/drain bolts with the crankcase oil injection or coolant drain bolts.
  • Unlike later 4-stroke models, there is no oil filter to swap, but some units include a mesh/screen filter at the drain–inspect and clean if present.

Step-by-Step Oil Change Instructions

  1. Prepare Your Workspace
    • Allow the bike to cool for 10–15 minutes if recently used; warm oil drains more effectively, but you want to avoid burns.
    • Stand the bike upright on a level surface. Using a lift or center stand is ideal but a secure static stand works.
    • Place your drain pan beneath the transmission drain plug (usually on the bottom of the right crankcase cover).
  2. Remove the Drain Plug
    • Locate the gearbox oil drain bolt – for 2011 EC 250s, this is generally on the underside of the right case. Use an 8mm or 13mm socket/allen as required.
    • Loosen and remove the bolt, along with its washer/crush washer.
    • If the bike has a mesh screen (often placed just inside of the drain opening), gently remove it and set aside for cleaning.
  3. Drain the Old Oil
    • Allow the oil to fully drain. Tilting the bike upright from side to side a bit can help clear out residual oil.
    • If a screen is present, clean it with solvent and inspect for debris or metal shavings. Excess metal suggests impending transmission problems.
    • Use a rag to carefully wipe any spilled oil around the area.
  4. Reinstall the Drain Plug
    • Inspect the crush washer–replace if deformed for a proper seal.
    • Install the drain plug (and mesh screen, if present) back into place, threading by hand to avoid cross-threading.
    • Tighten with a torque wrench to manufacturer specifications (typically around 10–14 Nm).
  5. Refill with Fresh Transmission Oil
    • Remove the gearbox oil fill plug (usually on the right crankcase cover, above the clutch).
    • Use a funnel to pour in the specified amount (generally about 750–800ml; check your owner's manual for exact volume).
    • The sight glass (if equipped) should show the level mid-way when the bike is upright; otherwise, fill to the lower threads of the fill hole.
    • Reinstall the fill cap securely.
  6. Double Check and Clean Up
    • Start and run the bike for 2–3 minutes. Shift through all gears, then turn off and let settle for a minute.
    • Check for leaks around the drain plug and fill hole.
    • Re-inspect oil level and top off if necessary.
    • Dispose of used oil responsibly at your local recycling center.

Expert Tips for the 2011 GAS GAS EC 250

  • Always use the correct oil type and volume for your model as per the owner's manual. Avoid gear oil with a high sulfur content as this can attack yellow metals in the gearbox.
  • If the bike is routinely used in racing or wet/muddy conditions, change the oil more frequently.
  • Always inspect oil for metallic particles; minor residue is normal, but large or increasing fragments may indicate a problem.
  • Confirm the presence and orientation of any drain plug O-rings (refer to your specific bike's diagram if unsure).
  • Do not overtighten the plug–a stripped case is a costly fix.

Owner Notes

  • Do not mix up the oil injection (if fitted, for premix operation) and the gear oil fill/drain plugs–their locations differ and functions are not interchangeable.
  • The EC 250 chassis may require you to temporarily remove or reposition the skid plate or lower frame bolt for drain plug access.
  • Routine gearbox oil changes will significantly extend clutch and transmission component life.

By following these detailed steps, 2011 GAS GAS EC 250 owners can maintain their bikes with confidence and keep the ride running smooth for seasons to come. For more model-specific tips, OEM parts, and gear, visit MotoSport.com.

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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.