How to Change the Oil in a 2007 GAS GAS EC 250 – MotoSport.com Expert Guide

Shop parts for a 2007 GAS GAS EC 250 Dirt Bike.

Regular oil changes are crucial to keeping your 2007 GAS GAS EC 250 two-stroke dirt bike running at its best. This process helps prevent premature engine wear and ensures smooth operation on and off the track. While the process is straightforward, there are some specific points every EC 250 owner should know. Follow this robust, detailed guide with step-by-step instructions, tool lists, and call-outs unique to this capable enduro.

Tools and Materials Needed

  • Socket wrench set (including 13mm socket and 13mm wrench)
  • Allen wrench set (8mm if your model has an Allen drain tank)
  • Drain pan
  • New engine/transmission oil (consult owner's manual for volume and spec; typically 10W-40 or 75W transmission oil for two-strokes)
  • New crush washer or O-ring (optional, but recommended for the drain plug)
  • Clean rags
  • Parts cleaning brush or contact cleaner (optional but recommended)
  • Funnel
  • Rubber gloves (optional for cleanliness)

Special Model-Specific Call-Outs for 2007 GAS GAS EC 250

  • The EC 250 is a two-stroke with a separate transmission oil compartment – you do not change oil in the crankcase.
  • The drain plug is typically located on the bottom left of the engine case. It is usually a 13mm bolt.
  • Inspect the magnetic tip of the drain bolt for shavings after removal – a few fine shavings are normal, but excessive chunks may indicate transmission wear.
  • Always use a dirt-bike-specific stand. Avoid standard automotive ramps as they make access to the drain plug difficult and may tip the bike.
  • Changing the oil filter is not required, as there is no engine oil filter in two-stroke gearboxes; however, clean the oil fill and drain areas to avoid contamination.

Step-by-Step Process

  1. Warm up the bike:
    Briefly start your EC 250 and let it idle for 2-3 minutes. Warm oil drains faster and carries more contaminates out of the gearbox. Shut the engine off before proceeding.
  2. Set the bike on a stand:
    Position your bike on a secure stand so it is upright and level. This ensures proper drainage of oil.
  3. Remove the fill plug:
    The transmission oil fill plug is usually on the right side of the engine. Remove it using the appropriate tool (often a large flathead or 8mm Allen). This allows oil to drain more quickly.
  4. Place a drain pan underneath:
    Position a drain pan directly under the engine's drain bolt, on the bottom left side of the case.
  5. Remove the drain bolt:
    Use a 13mm wrench or socket to loosen and remove the drain bolt. Allow all the oil to fully drain out. Be patient—this can take several minutes. Inspect the tip of the bolt for metal particles and wipe it clean.
  6. Inspect and clean the area:
    Clean the drain bolt and the area around the drain hole with a rag. If your model uses a crush washer or an O-ring, check its condition. Replace if damaged or flattened.
  7. Reinstall drain bolt:
    Once oil has fully drained, reinstall the drain bolt with a cleaned washer or a new one if needed. Tighten snugly but do not overtighten (recommended torque is around 15 Nm or 11 ft-lbs, but consult your manual).
  8. Refill with fresh oil:
    Use a funnel to pour in the recommended gearbox oil. The capacity for most EC 250 models is about 750-850 ml. Double-check the spec in your owner's manual. Replace and tighten the fill plug.
  9. Check oil height:
    Many GAS GAS EC 250 models have an oil level check screw (often a 5mm Allen) on the side of the clutch cover. Remove this check screw: if oil seeps out with the bike upright, the level is perfect. If it doesn't, add a small amount of oil until it does.
  10. Clean up and dispose of used oil responsibly:
    Wipe away any spills, reinstall all plugs, and dispose of used oil at your local recycling station or auto parts store.

Pro Tips

  • Always use a high-quality synthetic or semi-synthetic gear oil designed for dirt bikes. Your EC 250's clutch and transmission last longer with the correct spec.
  • Inspect bolts and threads for damage at each oil change; replace any worn hardware to prevent leaks.
  • Document your maintenance intervals for resale value and reliability.

Warnings and Model-Specific Advice

  • Never overtighten drain or fill bolts—stripped threads are a common (and costly) issue.
  • The GAS GAS EC 250 does not use an oil filter for engine oil. The only routine service is the gearbox oil.
  • If your drain bolt has a magnet, always check for excessive steel fragments. Large metal pieces indicate an urgent need for gearbox inspection.
  • Double-check all washers and O-rings; leaks develop rapidly on these two-stroke gearboxes if seals are damaged or missing.
  • If you're unsure about oil capacity, always err on the side of slightly less and check the level screw again after a short ride.

With these instructions, you can confidently and properly change the oil in your 2007 GAS GAS EC 250. For all your tools, supplies, and factory oils, trust MotoSport.com to have the best brands, parts, and expert support to keep your dirt bike performing at its peak.

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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.