How to Change the Oil in a 2010 GAS GAS EC 250: Step-by-Step Guide

Shop parts for a 2010 GAS GAS EC 250 Dirt Bike.

Changing the oil in your 2010 GAS GAS EC 250 is one of the most important maintenance tasks to keep your dirt bike running smoothly. This guide, exclusive to MotoSport.com, covers the tools required, detailed steps, and important model-specific tips to help you accomplish the task efficiently and safely.

Tools and Supplies Needed

  • 13mm socket or wrench (for drain bolt)
  • 8mm Allen wrench (for oil filter cover, if equipped)
  • T30 Torx bit (if applicable for fasteners)
  • Oil catch drain pan
  • Contact cleaner (quick-drying, residue-free)
  • Clean rags
  • New oil filter (if required for your model)
  • Fresh engine oil (consult owner's manual for type and quantity; typically 10W-40 or 10W-50 for GAS GAS EC 250 models)
  • Crush washer (recommended for drain bolt replacement)
  • Torque wrench (for precise reinstallation of drain bolt)
  • Needle nose pliers (for the oil screen, if your bike is equipped)
  • Latex or nitrile gloves (optional, for a cleaner process)

Step-by-Step Oil Change Instructions

  • Warm Up the Engine
    Start your bike and let it run for a few minutes. This warms the oil, helping it drain more completely.
  • Secure the Bike
    Position the bike on a stable stand. Avoid center or triangle stands that obstruct access to the drain bolt. Instead, use a platform lift or a stand that leaves the area below the engine clear. For easier draining, slightly lean the bike.
  • Locate the Drain Bolt
    Find the drain bolt under the engine. On the 2010 GAS GAS EC 250, it's typically a 13mm bolt. Place your drain pan underneath this area.
  • Remove the Drain Bolt
    Use the 13mm wrench or socket to break the bolt loose and unscrew it by hand. Let all the old oil drain out. Watch for the magnetic end on the drain bolt–it attracts metal shavings. Clean any debris from the magnet with a rag.
    Model-Specific Tip: The EC 250's drain plug is often magnetic. Ensure it's free of shavings to detect early engine wear.
  • Inspect and Clean the Oil Screen
    If your model includes an oil screen, remove it with needle nose pliers. Clean it thoroughly and check for metal shavings. Replace it immediately if it is damaged.
    Replace the crush washer on the drain bolt to prevent leaks upon reinstallation.
  • Oil Filter Removal and Replacement
    On some EC 250 models, remove the oil filter cover with an 8mm Allen wrench. Take out the old filter, noting its orientation. Before installing the new filter, add a few drops of fresh oil to the rubber seal. Insert the new filter, ensure proper alignment, and replace the cover, tightening each bolt evenly.
    Model Note: Not all GAS GAS EC 250s have a removable oil filter; some use an internal screen only. Check your owner's manual to confirm filter type.
  • Clean the Drain Area and Reinstall the Drain Plug
    Thoroughly clean the area around the drain plug and sealing surfaces. Reinstall the plug with a new crush washer, using a torque wrench to tighten it to factory specification (typically in the range of 14–18 ft-lb; always verify with your owner's manual).
  • Add New Oil
    Remove the oil fill cap. Pour in new oil slowly, checking the sight glass or dipstick for proper level. GAS GAS EC 250 models typically require between 0.8 to 1 liter of oil, but consult your owner's manual for your exact year.
  • Check for Leaks
    Wipe down the engine and start the bike. Let it idle for a minute, then shut off and check for leaks at the drain plug and around the filter cover. Add more oil as needed to reach the correct level.
  • Dispose of Used Oil & Clean Up
    Pour the used oil into a sealed container and take it to a recycling center. Clean your tools and work area.

2010 GAS GAS EC 250-Specific Notes

  • Drain plug access: On some earlier EC 250 models, the exhaust expansion chamber may partially obstruct access to the drain bolt. If so, take care not to burn yourself or, if needed, loosen the pipe retaining springs for extra working room.
  • Oil type and quantity: Only use high-quality 2-stroke specific gearbox oil (not 4T engine oil), typically 10W-40. The recommended quantity is around 1 liter for most models.
  • Frequency: For high-performance riding or racing, change the oil every 10 hours of use; for casual trail riding, 20 hours is sufficient.
  • Inspect for leaks: The 2010 model is known for a relatively simple lubrication circuit, but always check gaskets and sealing washers for damage to avoid future leaks.

Troubleshooting and Additional Tips

  • If oil appears milky, check for coolant contamination (potential water pump seal leak).
  • If excessive metal is detected on the plug's magnet, consider immediate inspection for gearbox or clutch wear.
  • Don't overfill—excess oil can cause clutch drag and shifting problems.
  • Record the oil change date and maintain a regular schedule for increased reliability.

For additional model-specific maintenance or troubleshooting, consult your GAS GAS EC 250 owner's manual or the MotoSport.com technical support team for genuine parts and expert advice.

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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.