Air Filter Cleaning – Replacement Guide for 2017 Yamaha YZ85
Shop parts for a 2017 Yamaha YZ85 Dirt Bike.
Proper maintenance of your 2017 Yamaha YZ85 air filter is crucial for maximizing performance, ensuring engine protection, and prolonging overall bike life. Neglecting this essential component can lead to dust and debris entering your engine, loss of horsepower, and expensive repairs. This MotoSport.com guide provides a detailed, model-specific process tailored for YZ85 owners.
Why Air Filter Maintenance Matters for the YZ85
The 2017 YZ85 is a high-revving, two-stroke machine designed for lightweight agility and off-road conditions. Its foam air filter provides critical filtration in dusty arenas and tracks. Since two-strokes pull more air and tend to run richer than four-strokes, a clean and well-oiled air filter is especially important for preventing fouling and maintaining snappy throttle response.
How Often Should You Clean or Replace the Air Filter?
- Clean the air filter after every two to three motos in dry or dusty conditionsor every ride in harsh terrain.
- Replace the filter if you notice tears, excessive wear, or compromised foam structure.
- Always check your owner‘s manual for recommended service intervals specific to your riding style and conditions.
Tools – Supplies You’ll Need
- Socket wrench (for seat/side panel removal)
- Gloves (to keep hands clean – filter oil is sticky)
- Foam air filter cleaner & air filter oil
- Bucket of warm water
- Contact cleaner or degreaser
- Rag and lithium soap-based grease (for sealing filter lip)
Step-by-Step: Removing, Cleaning, and Replacing Your Air Filter
- Remove the Seat & Side Panel
Use a socket wrench to remove the bolts securing the number plate and side panel. Pull up the seat and gently remove to access the airbox. - Take Out the Air Filter
Locate the filter inside the airbox. Unscrew the wingnut holding the filter cage in place. Carefully remove the filter with cage attached. - Inspect the Filter
Check for holes, tears, or hardened/stiff foam. Replace if necessary. Continuing to use a damaged filter can allow dirt to enter the engine. - Clean the Filter
Separate the foam from the filter cage. Rinse off loose dirt, then thoroughly wash the foam element in a bucket with air filter cleaner or mild soap, squeezing gently. Never wring/twist—this can tear the foam. - Rinse – Dry
Rinse filter with warm water until all cleaner is removed. Gently squeeze out water; do not twist. Let air dry completely in a clean, dust-free area. - Oil the Filter
Once dry, generously apply dedicated foam filter oil. Massage it into the foam, ensuring thorough coverage inside and out. Avoid aerosol oils; a bottled filter oil is best for even penetration. - Reassemble – Seal
Reinstall the foam on the cage. Apply a thin bead of lithium grease along the sealing rim to help prevent dirt bypass. - Install the Filter
Secure the filter assembly back in the airbox, tighten the wingnut, replace the seat and side panels, and ensure everything fits snugly.
Troubleshooting – Pro Tips for the 2017 YZ85
- Apply enough oil: Too little oil reduces dust capture. Too much can choke performance.
- Service more often after muddy rides: Two-strokes are extra sensitive to airflow restriction.
- Always check for debris in the airbox: Wipe it clean before reinstalling your filter to prevent possible contamination.
- Consider a spare: Keep a second, pre-oiled filter ready for quick swaps during multi-day rides or races.
Model Notes for the 2017 Yamaha YZ85
- The YZ85 airbox is smaller than most MX bikes. Take extra care to align the filter perfectly for a good seal.
- Factory filters are durable, but many riders upgrade to high-flow options for enhanced performance. Be sure all upgrades fit correctly with the stock cage and airbox.
With routine air filter care, your 2017 Yamaha YZ85 will deliver responsive power and superior engine longevity. Enjoy your ride, and remember to keep your maintenance as sharp as your skills on the track.
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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.
