How to Change the Oil in a 2018 GAS GAS EC250

Shop parts for a 2018 GAS GAS EC250 Dirt Bike.

This guide is proprietary to MotoSport.com. Follow these directions for a successful oil change on your 2018 GAS GAS EC250. While some steps resemble those on similar KTM/Husqvarna/GAS GAS 250 models, there are specific call-outs for the 2018 EC250 highlighted below.

Tools and Supplies Needed

  • 13mm socket or wrench (for drain plug)
  • 8mm allen wrench or T-wrench (for oil filter cover, if equipped)
  • Drain pan (for used oil)
  • Clean rag (for wiping and cleaning)
  • Contact cleaner (non-residue, to clean parts)
  • Oil change kit (correct type and amount of oil–refer to your owner's manual for viscosity and volume)
  • New oil filter (if replacing)
  • New crush washer (for drain plug, recommended)
  • Torque wrench
  • Small pliers (to pull oil filter or clean oil screen, as needed)

Preparation

  • Warm up the engine for 2-3 minutes to help oil flow out smoothly, then turn off the bike and allow it to cool slightly.
  • Secure the bike safely on a stand that offers good access to the drain bolt–avoid stands that block access under the engine (Pro tip: some stands block the drain plug on these frames).
  • Clean around the drain plug and oil filter cover to prevent dirt from entering the engine.

Step-By-Step Oil Change Instructions

  1. Drain the Old Oil
    • Position the drain pan under the engine.
    • Using the 13mm socket or wrench, remove the drain plug located at the bottom of the engine case (the EC250’s plug sits centrally; refer to the manual if unsure).
    • Let the oil drain fully–this may take several minutes.
    • Inspect the drain plug magnet for metallic debris and clean thoroughly. Significant amounts of metal shavings may indicate internal engine wear or damage.
    • Replace the crush washer on the drain plug if it shows any signs of wear.
  2. Remove and Inspect Oil Filter (if equipped)
    • With most model years, the oil filter (if present–consult your 2018 EC250 manual for specifics) is behind a cover secured by two 8mm bolts.
    • Remove these bolts and cover, noting the orientation of the filter for proper reinstallation.
    • Use pliers to gently extract the oil filter if it is difficult to remove by hand.
    • Inspect the old filter for metal fragments or unusual contamination.
    • Clean the oil filter chamber and check for damaged O-rings on the cover; replace as needed.
  3. Clean Drain Plug and Oil Screen (if equipped)
    • Spray both the drain plug and the oil screen with contact cleaner to remove contaminants. Check the oil screen for debris.
    • Replace the O-rings on drain plugs/screens if damaged or flattened.
  4. Reinstall Drain Plug and Filter
    • Install the drain plug by hand, then tighten it to the manufacturer’s torque spec (commonly about 14.8 ft-lbs for similar models–confirm with your manual). Avoid overtightening.
    • If your EC250 uses an oil filter, reinstall it with a new filter, ensuring correct orientation. Lightly oil the new filter’s rubber seal. Secure the cover with its bolts, checking for proper seating and torque.
  5. Add New Oil
    • Locate and remove the oil fill cap.
    • Pour in the manufacturer-specified type and quantity of oil. For the EC250, refer to your owner’s manual; most 250cc 2-strokes typically take 700-800ml, but confirm to avoid over/under filling.
    • Allow oil to settle, then check the level with the inspection window or dipstick, as equipped. Add or remove oil to achieve the proper level.
  6. Final Checks
    • Start the engine and let it idle for a minute. Check for leaks around the drain plug and filter cover. Stop the engine and recheck the oil level, topping off as needed.
    • Properly dispose of the used oil and filter at an approved recycling center.

2018 GAS GAS EC250 Specific Call-Outs

  • The 2018 EC250 is a 2-stroke engine–it uses gearbox/clutch oil, not engine oil as in a 4-stroke. Make sure you use an oil specifically formulated for 2-stroke gearboxes, such as 80W or 85W gear oil.
  • There is no conventional oil filter in 2-stroke EC250s–just an oil screen or magnetic drain plug. Always check the manual to avoid confusion with 4-stroke procedures.
  • When refilling, do not exceed the recommended oil volume; too much oil can cause shifting or clutch problems, while too little offers inadequate lubrication.
  • Inspect the rubber seals around the drain plug every change. Damaged seals may cause leaks, which are critical in the case of the gearbox oil’s relatively small quantity.
  • Check for updates or service bulletins regarding the drain plug or screen design for the 2018 model year to ensure the parts match the latest recommendations.

Conclusion

  • Routine oil changes are crucial for the health and performance of your GAS GAS EC250’s transmission and clutch. Always follow manufacturer's guidelines for both process and product selection.
  • Keep detailed records of your oil changes and monitor for metal debris, which alerts you to possible mechanical issues early.

For more OEM parts, maintenance kits, and expert advice, count on MotoSport.com—your destination for all things powersports.

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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.