How to Change the Oil on a 2009 GAS GAS EC125: A Complete Step-by-Step Guide
Shop parts for a 2009 GAS GAS EC125 Dirt Bike.
Changing the oil in your 2009 GAS GAS EC125 is a fundamental and necessary maintenance task that ensures your dirt bike's engine performs at its best. Doing it correctly helps prolong engine life and maximizes reliability, especially with the high-performance demands of the GAS GAS EC125 two-stroke enduro machine. This blog outlines the correct procedure, recommended tools, essential tips, and specific guidance for this model, ensuring your next oil change is efficient, clean, and trouble-free.
Tools and Materials Needed
- Socket wrench set (including correct size for drain bolt; typically 13mm or 17mm for most GAS GAS models, but confirm with your service manual)
- Drain pan (holds at least 1 liter of fluid)
- Funnel
- Measuring cup (graduated, for precise oil volume)
- Clean rags or paper towels
- New crush washer (recommended to replace with every oil change)
- Transmission/gearbox oil (check owner's manual for oil spec; typically 75W-80 full synthetic for this 2-stroke model)
- Gloves (optional, but advisable to keep hands clean)
- GAS GAS EC125 Owner’s or Service Manual (for torque specs and reference)
Step-by-Step Procedure
-
Warm up the engine
- Briefly run the bike for 2–3 minutes. This thins out the old oil, helping it drain out more thoroughly.
-
Secure the bike
- Stand the bike upright on a stable stand. Ensure it's balanced—this is crucial for accessing the drain bolt and preventing spills.
-
Locate the drain bolt
- The oil drain bolt is usually at the lowest part of the engine case on the left side. For the 2009 GAS GAS EC125, consult your service manual if you’re uncertain. Clean the area around the bolt to prevent contamination.
-
Prepare to drain the oil
- Place the drain pan beneath the drain bolt. Wear gloves to protect your hands from hot oil.
-
Remove the drain bolt
- Using the socket wrench, carefully loosen and remove the bolt.
- Allow the oil to drain completely. This may take several minutes.
- Tip the bike gently from side to side to help remove all the old oil.
-
Inspect and replace the crush washer
- Examine the crush washer for wear or damage. Always replace it if it looks flattened or cracked.
- Install the new crush washer onto the drain bolt.
-
Reinstall the drain bolt
- Wipe any oil residue from the threads and seating area.
- Hand-thread the bolt first to avoid cross-threading, then tighten with the socket wrench. Use the torque spec listed in your manual for best results—over-tightening can crack the crankcase.
-
Refill with new oil
- Reference your service manual for oil type and quantity; most 2009 GAS GAS EC125 bikes require approximately 0.7 to 0.8 liters of transmission oil, but always verify your model’s spec.
- Remove the fill plug or cap, typically located on the right side.
- Insert the funnel and pour in the recommended oil.
- Use the measuring cup for precision, as overfilling can cause poor shifting or leaks.
-
Check oil level
- Some EC125s have a sight glass or dipstick; others simply require you to fill to the bottom thread of the fill hole with the bike level.
- Wipe away any excess oil and reinstall the fill cap securely.
-
Inspect for leaks and test
- Start the engine and let it run briefly. Check underneath and around the drain bolt for any sign of leakage.
-
Dispose of old oil responsibly
- Transfer the used oil to a sealed container and recycle at your local auto parts or recycling center. Never dump motorcycle oil publicly or down drains.
Model-Specific Call-Outs for the 2009 GAS GAS EC125
- Crush Washer: Replacing the crush washer with every oil change helps prevent leaks, a common issue due to the relatively thin case material on these bikes.
- Oil Capacity: The EC125 uses less oil than 4-stroke models. Do not overfill. Overfilling increases crankcase pressure, leading to leaks and possible clutch drag.
- Oil Spec: Always use a top-quality, synthetic 2-stroke transmission oil such as Motorex Cross Power 2T or high-grade 75W-80 gear oil. Engine oil for combustion is in the premix, not the crankcase.
- Missing Oil Filter: Unlike 4-stroke engines, this 2-stroke model does not use an internal oil filter; regular oil changes are even more critical.
- Service Interval: Change oil every 10–15 hours of use, or after any deep water crossings or racing sessions.
- Sight Glass/Dipstick: Some GAS GAS EC125 bikes have an oil level sight glass; if not, fill just to the bottom of the fill plug threads (with bike upright).
- Thread Caution: The drain plug threads are soft aluminum; always start gently and never force the bolt. If resistance is high, remove and re-thread by hand to avoid damage.
Why Regular Oil Changes Matter
The 2009 GAS GAS EC125's transmission and clutch rely on clean oil for slick shifting and long clutch life. Riding in sand, mud, or wet environments accelerates oil contamination. Regular changes remove abrasive particles and moisture, ensuring your GAS GAS delivers consistent performance every ride.
Brought to You By MotoSport.com
This guide is proprietary to MotoSport.com and is part of our commitment to help riders get the most out of their machines with accurate, model-specific maintenance information. For all your OEM parts, oils, and maintenance supplies, trust the experts at MotoSport.com.
Related Shopping Categories
Shop Motor Oil for a 2009 GAS GAS EC125 Dirt Bike.
Shop Oil Filters for a 2009 GAS GAS EC125 Dirt Bike.
Shop Oil Drain Pans for a 2009 GAS GAS EC125 Dirt Bike.
Shop Tools for a 2009 GAS GAS EC125 Dirt Bike.
Shop Oil Fillers and Drain Plugs for a 2009 GAS GAS EC125 Dirt Bike.
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.