How to Change the Oil in a 2007 GAS GAS EC125: Step-by-Step Guide

Shop parts for a 2007 GAS GAS EC125 Dirt Bike.

Keeping your 2007 GAS GAS EC125 in top condition means performing regular maintenance—changing the transmission oil is one of the most important tasks for longevity and performance. This MotoSport.com exclusive guide covers all the tools you’ll need, steps to follow, and model-specific tips to ensure a smooth oil change.

Tools & Materials Needed

  • Socket wrench set – To remove bolts and drain plug
  • Oil drain pan – To catch used oil safely
  • Clean funnel – For pouring new oil
  • New transmission oil – Use manufacturer-recommended type and quantity
  • Replacement crush washer (if necessary)
  • Rag or shop towels
  • Gloves (optional, but recommended)

Transmission Oil Type & Amount for 2007 GAS GAS EC125

  • Transmission oil type: Consult your owner’s manual for the exact oil specification. Typical choices are premium 2-stroke transmission/gearbox oils (10W-40, 75W-80, or as recommended by the manufacturer) for this model.
    Check fluid compatibility carefully, as improper fluid can lead to clutch and transmission issues.
  • Oil quantity: Refer to the service manual or crankcase marking, but most EC125s require about 750cc (0.75L) of oil for a full change .

Step-by-Step Instructions

  1. Warm Up and Secure the Bike
    • Start the engine and let it run for two to three minutes to warm up the oil. Warm oil drains faster, pulling out more contaminants.
    • Shut off the engine. Place the bike on a stable stand so it’s upright and level.
  2. Locate the Transmission Oil Drain Plug
    • The drain plug is found on the bottom (or side) of the engine crankcase, typically on the right side under the engine. Check the manual for the exact position on the 2007 EC125 .
  3. Remove the Fill Cap
    • Twist off the oil filler cap, found on the clutch cover. This allows air in and helps the oil drain smoothly.
    • The OEM filler plug can be replaced with aftermarket options, but ensure any new plug is compatible with 2007 EC125 threads .
  4. Drain the Old Oil
    • Position your oil catch pan directly under the drain plug.
    • Using a socket wrench, carefully remove the drain plug. Let the oil drain completely—give it several minutes for a thorough emptying.
    • If the crush washer on the drain plug is damaged or worn, replace it to ensure future leak-free operation.
    • Inspect the oil for metal flakes or unusual discoloration, which could signal internal wear.
  5. Reinstall the Drain Plug
    • Once all the oil is drained, clean the plug and threads. If using a new crush washer, install it now.
    • Thread the drain plug in by hand and then tighten securely with the wrench. Do not overtighten – refer to torque specs in your service manual if needed .
  6. Add New Transmission Oil
    • Place a funnel in the oil filler neck.
    • Pour in the measured amount of new, correct-specification oil (about 750cc, but check for your bike’s stamp or manual for precise capacity) .
    • Replace and secure the filler cap.
  7. Check Oil Level
    • Some EC125 models have a sight glass or dipstick on the side of the crankcase. Make sure the oil level is within the correct range. If not, adjust carefully.
    • Do not overfill; excess oil can increase pressure, causing leaks or clutch drag .
  8. Dispose of Used Oil Properly
    • Take the used oil to a recycling facility or auto parts store that accepts waste oil. Do not dump oil on the ground or in household garbage.

Specific Tips & Notes for the 2007 GAS GAS EC125

  • Unlike four-strokes, the 2007 GAS GAS EC125 uses oil only for its transmission, not for crankcase lubrication, due to its 2-stroke engine.
  • The OEM oil filler and drain plugs are aluminum and can strip if over-tightened. Always start threads by hand and do not use excessive force.
  • Aftermarket accessories (e.g., colored oil fillers) are available, but verify correct sizing for 2007 EC125 .
  • Use only non-synthetic/semi-synthetic gear oil if recommended by the manufacturer to avoid potential clutch issues. Always match viscosity grades to the climate in which you’re riding.
  • If you notice any abnormal oil residue or debris, consult a mechanic or your dealer for further diagnosis.

Maintenance Schedule Reminder

  • Oil changes for a 2-stroke transmission should be done every 10-15 engine hours of riding or whenever oil gets dirty or cloudy .

This guide is proprietary to MotoSport.com. Proper care and regular maintenance keep your 2007 GAS GAS EC125 running reliably for every ride.

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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.