Air Filter Cleaning – Replacement Guide for 2016 Kawasaki KX85

Shop parts for a 2016 Kawasaki KX85 Dirt Bike.

Maintaining a clean and well–lubricated air filter is crucial for the performance and engine longevity of your 2016 Kawasaki KX85. MotoSport.com presents this proprietary guide tailored specifically for your KX85—from cleaning to replacing the air filter based on the unique needs of this nimble two-stroke dirt bike.

Preparation – Tools and Products Needed

  • 8mm socket for seat bolt removal
  • Specialized air filter cleaner & oil
  • Disposable gloves
  • Clean rags or paper towels
  • Grease (optional for filter rim sealing)

Step 1– Removing the Air Filter

  • Use the 8mm socket to remove the two seat bolts. Lift off the seat to access the air box.
  • Undo the wing nut securing the filter center post and carefully lift out the air filter.
  • Make sure not to drop debris into the air intake. Cover the intake with a clean rag while working around the air box.

Step 2– Cleaning the Filter & Airbox

  • Inspect the air box and wipe any dust or dirt with a clean rag. Avoid letting debris fall into the intake tract as it may cause engine damage.
  • Soak the foam filter in a dedicated air filter cleaning solution. Do not wring or twist the filter aggressively—gently squeeze and massage to remove oil and dirt. Vigorous handling may tear the foam and compromise filtration.
  • Rinse thoroughly with clean water until solution and debris are removed. Gently squeeze to remove excess water and allow the filter to fully air dry—preferably out of direct sunlight.

Step 3– Oiling the Filter

  • Once dry, saturate the entire filter with high-quality filter oil. Massaging the oil evenly throughout the foam maximizes the filter's ability to trap dust and sand. It is essential on the KX85 and other two-stroke motocross bikes for maximum engine protection.
  • Consider applying a thin layer of grease around the sealing ring of the filter for enhanced air box seal. However, on the KX85, many owners find this optional, as a properly oiled filter offers adequate sealing.

Step 4– Installing the Clean or New Filter

  • Align the filter's center hole with the air box post. Ensure the plastic cage is centered and the filter seats evenly for a secure fit.
  • Reinstall the wing nut and tighten until snug, but avoid over-tightening which can warp the filter cage.
  • Replace the seat using the two seat bolts.

When to Replace vs. Clean

  • Inspect the foam for signs of tear, excessive discoloration, or breakdown. If damaged, replace immediately to prevent engine contamination and loss of power.
  • Twin Air filters for the KX85 feature a dual-layer open-pore design to maximize airflow and filtration. These filters are robust but should be replaced if adhesive seams separate, or foam loses its integrity.
  • As a guideline, clean the filter every ride in dusty conditions, and every 2-4 rides in cleaner environments.

KX85 Model Considerations

  • The 2016 KX85 uses a foam filter designed for motocross – quick cleaning and oiling are essential before every competitive use.
  • Check the filter for coarse grains or oily patches, as these two-stroke models tend to run rich, which increases the risk of clogging.
  • Always inspect the seal between air filter and air box – loss of seal can cause rapid engine wear due to the high-revving nature of the KX85.

Proper air filter maintenance is critical for protecting the engine and optimizing the powerband of your 2016 Kawasaki KX85. Frequent cleaning, thorough oiling, and timely replacement ensure your ride stays ready for the track or trail.

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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.