Air Filter Cleaning – Replacement Guide for 2009 GAS GAS EC125
Shop parts for a 2009 GAS GAS EC125 Dirt Bike.
The 2009 GAS GAS EC125 is a high-performance two-stroke enduro machine, demanding consistent maintenance for peak results. The air filter on this model is critical to engine health – improper care can lead to decreased power, excessive wear, or engine failure.
About the 2009 GAS GAS EC125 Air Filter
This model uses a dual-stage foam filter. The outer layer stops large dirt and debris, while the fine open-pore inner foam captures smaller particles yet ensures unrestricted airflow. Quality replacement filters from leading brands feature fused layers that prevent dirt passage between layers and are standard across factory-level GAS GAS teams.
When to Clean or Replace the Air Filter
- Inspect after every ride in dusty or wet conditions.
- Clean after 1-2 rides in dry dust or sand.
- Replace if the foam is torn, permanently stained, or losing its pliability.
- Always use a clean, well-oiled filter for best engine performance.
Tools – Supplies Needed
- Gloves
- Air filter cleaning solvent or warm soapy water
- Air filter oil (foam filter specific)
- Rag – plastic bag
Removal Process – 2009 GAS GAS EC125
- Remove the seat to access the airbox – on the EC125, release the seat through the rear mounting bolt.
- Gently unclip and pull the air filter and its cage out of the airbox.
- Visually check the cage for cracks or damaged foam (replace if needed).
Cleaning the Air Filter
- Peel the filter off its cage.
- Place dirty foam in a plastic bag with air filter cleaner or warm soapy water.
- Knead gently – do not wring or twist aggressively, as this can tear the foam. Rinse thoroughly with clean water.
- Squeeze out excess liquid and allow to dry completely.
Oiling – Reinstalling
- Apply foam filter oil evenly to the entire foam (inside & out). Massage to ensure full coverage. Excess oil can be gently squeezed out.
- Reinstall the filter onto its cage, ensuring a perfect seal – any gap invites dirt straight into your engine.
- Wipe the airbox rim, then fit the oiled filter securely. Reinstall the seat.
Pro Tips for Your GAS GAS EC125
- The EC125’s chassis layout makes for quick filter access. Carry a spare clean, oiled filter on trips for instant swaps between heats or group rides.
- Check the cage integrity every cleaning – a cracked cage can create a leak channel.
- If riding in extremely wet/muddy conditions, check the airbox for water entry and drain if necessary to prevent filter saturation.
- OEM-grade or premium dual-stage filters are optimal for this model—avoid universal or single-layer foam alternatives for maximum protection and long engine life.
Consistent air filter care preserves your EC125’s sharp throttle response and keeps your two-stroke running as the engineers intended. Regular maintenance saves money, maximizes horsepower, and upholds that legendary GAS GAS reliability on 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.
