How to Change the Oil in a 2010 GAS GAS EC 300

Shop parts for a 2010 GAS GAS EC 300 Dirt Bike.

This comprehensive guide is proprietary to MotoSport.com and walks you through changing the oil in your 2010 GAS GAS EC 300. Changing the gearbox oil in your dirt bike is essential for prolonging the life of your clutch and transmission. Below you'll find all the tools you'll need, detailed step-by-step instructions, and specific callouts for your model.

Tools and Materials Needed

  • 6mm Allen socket or Allen wrench (for drain and fill plugs)
  • Socket wrench
  • Drain pan
  • Funnel (with a small spout for the fill hole)
  • Rags or paper towels
  • Brake cleaner (optional, for cleaning parts)
  • Measuring cup (for precise oil amount)
  • New gearbox oil (SAE 75W/80 or per owner's manual, 900cc required)
  • Torque wrench (recommended for re-tightening the drain bolt)
  • Gloves (optional, but keeps your hands cleaner)

Owner-Specific Callouts: 2010 GAS GAS EC 300

  • No oil filter: As a two-stroke, the EC 300 gearbox does not use an oil filter, so no need to replace one during this oil change.
  • Magnetic drain plug: The stock drain plug is magnetic and may collect some metallic debris. Clean it off before reinstallation.
  • Skid plate access: You may need to remove or partially loosen the skid plate to fully access the drain bolt, depending on your aftermarket or OEM setup.
  • Small fill hole: The fill hole is notably small, making a funnel with a narrow spout highly recommended. Laying the bike on its side can make the process easier.
  • Drain/fill plug material: The drain plug is aluminum—be gentle and make sure the Allen wrench seats fully to avoid stripping.

Step-by-Step Oil Change Instructions

  1. Preparation
    • Start with the bike on a stable stand and the engine cool.
    • Place a drain pan under the drain bolt (located at the bottom of the gearbox).
    • If your bike has a skid plate without an oil access hole, remove or loosen it to access the drain plug.
  2. Remove the Drain Plug
    • Use a 6mm Allen socket or wrench to carefully remove the drain plug.
    • Watch for the small aluminum washer on the drain plug; do not lose it.
    • Let the old oil drain completely. Tilting the bike slightly away from the kickstand can help improve drainage.
  3. Inspect and Clean the Drain Plug
    • The plug is magnetic and may have minor shavings attached. Wipe it clean with a rag or paper towel.
    • If available, use brake cleaner to clean the magnetic tip and the threads before reinstalling.
  4. Reinstall the Drain Plug
    • Hand-thread the drain plug to avoid cross-threading. Tighten with your Allen wrench, ideally using a torque wrench set to manufacturer spec (typically around 9–12 Nm; check your manual).
    • Do not overtighten—the aluminum threads can strip easily.
  5. Refill with New Oil
    • Locate the fill plug (right side of the engine, small access).
    • Remove the fill plug with your 6mm Allen wrench.
    • Using a funnel, slowly pour in 900cc of gearbox oil (SAE 75W/80 recommended), keeping an eye on the level.
    • If needed, tilt the bike slightly or use a syringe for more control due to the small fill hole.
  6. Reinstall the Fill Plug
    • Carefully thread in the fill plug by hand and use your Allen wrench to tighten.
    • Again, do not overtighten to avoid thread damage.
  7. Final Check and Cleanup
    • Ensure there are no leaks from the drain or fill plugs.
    • Wipe off any spilled oil and reinstall your skid plate if removed.
    • Dispose of used oil responsibly by taking it to an approved recycling facility.

Troubleshooting and Tips

  • If you see excessive metal debris on the magnet, monitor at the next oil change. Some is normal, but an increase might signal clutch or gear wear.
  • Always use the correct oil specification for your riding conditions and local climate.
  • Changing the oil every 5–10 hours of use or after every two or three rides ensures your transmission will operate smoothly and prolongs clutch life.
  • The fill and drain plugs should always be clean and free of old thread sealant or grit before reinstallation.

Model-Specific Notes (2010 GAS GAS EC 300)

  • The 2010 EC 300's fill and drain arrangement is similar to later EC 250/300 models, but always confirm the 900cc oil fill – overfilling can lead to clutch drag, especially if you ride tight singletrack.
  • The gearbox is entirely separate from the two-stroke engine oil system; only transmission/clutch lubrication occurs during this service.

Conclusion

Changing the transmission oil on your 2010 GAS GAS EC 300 is a straightforward process that requires only basic hand tools and about 20 minutes. Keeping up with this basic service will keep your bike running strong, gear changes smooth, and clutch life long. For any OEM parts, consult MotoSport.com – your trusted source for GAS GAS maintenance parts and more.

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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.