How to Change the Oil in a 2010 GAS GAS EC125 – Step-by-Step Guide
Shop parts for a 2010 GAS GAS EC125 Dirt Bike.
Changing the oil in your 2010 GAS GAS EC125 dirt bike is an essential part of regular maintenance and ensures the engine’s longevity and peak performance. This guide from MotoSport.com provides a complete breakdown of the process, listing the tools required, step-by-step instructions, and important model-specific advice.
Tools and Materials Needed
- Metric socket set (especially 8mm – 14mm sizes)
- Socket wrench and extension bar
- Drain pan suitable for oil
- Funnel
- Cleaning rags or paper towels
- Replacement oil (typically high-quality 2-stroke transmission oil, check manual for volume and type)
- New crush washer for the drain bolt (recommended for each change)
- Gloves (to protect hands from oil and grime)
- Shop manual (for reference and torque specs)
Step-by-Step Oil Change Process
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Warm up the engine
- Start the bike and let it idle for a few minutes. This heats the oil, making it less viscous and easier to drain fully.
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Secure the bike
- Place the EC125 on a stable stand or lift. Ensure it’s upright for a complete oil drain.
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Prepare your workspace
- Lay down protective materials if working inside, position your tools and drain pan under the engine.
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Remove the oil fill plug
- Loosening or removing it will prevent vacuum formation and ensure oil drains freely.
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Locate and remove the drain bolt
- The drain bolt is typically at the lowest point of the engine case on the right-hand side.
- Use the appropriate socket to remove the bolt. Let all oil collect in the pan.
- Note: Allow several minutes for all oil to evacuate. For thorough draining, you can carefully lean the bike toward the drain side.
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Inspect and replace the crush washer
- Always check the condition of the washer on the drain bolt. Replace with a new one to ensure a leak-free seal when reinstalling.
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Reinstall the drain bolt
- Thread the bolt by hand to avoid cross-threading, then tighten with a wrench to the manufacturer’s torque spec (consult your service manual).
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Refill with fresh oil
- Insert a clean funnel into the fill hole and pour in the specified volume and type of transmission oil (refer to your owner’s/service manual for correct quantity and type).
- Most 2-stroke transmissions take between 650ml and 750ml, but check your manual or markings for the EC125’s requirement.
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Replace the fill plug
- Thread it in by hand first, then snug with a wrench. Do not overtighten.
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Check for leaks
- Start the bike and let it idle for a few minutes. Inspect around the drain bolt and fill cap for any oil seepage.
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Dispose of old oil responsibly
- Take used oil to an appropriate recycling or disposal facility. Never pour oil onto the ground or into household drains.
2010 GAS GAS EC125 – Model-Specific Callouts
- This is a 2-stroke dirt bike: The oil you are changing is for the transmission, not engine lubrication—engine lubrication is mixed with fuel or supplied by an oil injection system. Only use recommended gear oil; engine oils designed for 4-strokes should not be used.
- Oil quantity and type: Always refer to your owner’s or service manual to confirm the required oil type and quantity. Using the wrong oil or overfilling can cause shifting issues or premature wear.
- No oil filter: The EC125 transmission does not require a replaceable oil filter as found in 4-stroke motorcycles.
- Crush washer replacement: GAS GAS recommends replacing the drain bolt washer each oil change to ensure a good seal and prevent leaks.
- Proper disposal: Dirt bike transmission oil picks up clutch debris and contaminants and should not be reused or left to sit too long between changes. Change at the recommended intervals based on riding conditions.
Expert Tips for the EC125
- Inspect the drained oil for metal shavings—large amounts can indicate abnormal wear.
- Check the magnet on the drain bolt (if fitted) and clean off any accumulated particles.
- Keep a log of maintenance for future reference and resale value.
Conclusion
Regularly changing the oil on your 2010 GAS GAS EC125 is crucial for its reliability and longevity, especially if ridden hard on track or off-road. Always use the correct tools, follow proper procedures, and consult your specific manual if unsure. Trust MotoSport.com for all your dirt bike maintenance needs and products.
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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.