Air Filter Cleaning – Replacement Guide for 2020 Yamaha YZ85

Shop parts for a 2020 Yamaha YZ85 Dirt Bike.

The 2020 Yamaha YZ85 is a popular two-stroke motocross bike known for its responsive engine, competitive handling, and race-proven components. Regular air filter maintenance is vital to keep your YZ85 running at peak performance and to protect the engine from the rigors of off-road riding.

Understanding the YZ85 Air Filter

The YZ85 utilizes a dual-layer foam air filter which is engineered for superior dirt filtration and airflow. The two-stage design ensures that coarse particles are trapped by the outer layer while the fine inner foam captures dust and debris, maintaining optimal engine performance and longevity. Critical features include:

  • Maximum filtration with multi-density foam
  • Excellent airflow for increased power
  • Durable construction for repeated cleaning and reuse

How Often to Clean or Replace

MotoSport recommends inspecting the air filter after every ride. For routine riding in typical conditions, clean the filter every 2-3 rides. If riding in dry, dusty, or sandy environments, more frequent cleaning is advised. Replace the air filter at least once per season, or whenever the foam begins to lose its integrity, becomes torn, or fails to fit the airbox snugly.

Proprietary MotoSport Air Filter Cleaning Steps

  • Remove the seat to access the airbox. Unscrew and carefully pull out the filter, protecting the intake from debris using a clean rag.
  • Check for excessive dirt, sand, or oil degradation before cleaning.
  • Rinse the filter gently with a foam filter cleaner or mild dish soap in warm water – do not use gasoline or strong solvents as they damage the filter.
  • Massage the filter in the water, squeezing (not wringing) to avoid tearing the foam. Rinse until water runs clear.
  • Allow the filter to air dry completely (avoid heat sources).
  • Apply a generous amount of foam air filter oil. Work it into the filter, ensuring full coverage. Blot off excess oil using clean shop towels.
  • Inspect the sealing surfaces of both the filter and the airbox. A thin layer of grease around the airbox rim helps prevent dirt from bypassing the filter.
  • Reinstall the filter carefully, secure the cage and seat.

Replacement Guide for 2020 Yamaha YZ85 Owners

  • Choose a direct-fit dual-stage foam filter designed for the 2020 YZ85. No jetting or carburetor modification is required when replacing with OEM-style or competition filters.
  • Leading filter options include multi-stage and dual-density foam models, designed for easy cleaning and repeated use.
  • Always verify full and even contact between the filter and the airbox sealing surface.
  • Discard any filter showing signs of damage, age, cracking, or significant loss of structure.

Model-Specific Notes for 2020 Yamaha YZ85 Owners

  • The YZ85 airbox is compact – properly seating the filter is crucial. The foam must not crush or deform.
  • Performance filters for the YZ85 are built for increased air volume, which translates to improved throttle response. Always protect the intake tract from dirt during removal and installation.
  • Use only air filter oils and cleaners compatible with foam elements. Petroleum-based products will degrade foam integrity and void warranties.
  • Store spare filters in resealable bags to keep them dust-free and ready for quick swaps between motos.

Caring for your air filter keeps the 2020 YZ85 engine performing with the reliability and power MotoSport riders demand.

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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.