Air Filter Cleaning – Replacement Guide for 2019 Kawasaki KX85

Shop parts for a 2019 Kawasaki KX85 Dirt Bike.

Proper air filter maintenance is critical to the performance & longevity of your 2019 Kawasaki KX85. MotoSport.com's step-by-step guide ensures you get maximum power – less wear & safe riding every time.

Why Air Filter Care Matters for KX85 Owners

The KX85's high-revving two-stroke engine is especially sensitive to dust & debris. Neglecting filter service can cause rapid engine wear or catastrophic damage. Cleaning or replacing the air filter is simple preventative maintenance that protects your investment.

Tools – Supplies Needed

  • 8 mm socket or T-handle
  • Clean rags
  • New air filter (if replacing)
  • Air filter oil (foam filter-specific)
  • Filter cleaner or mild, non-petroleum detergent
  • Nitrile gloves
  • Optional: waterproof grease (for filter base sealing)

How to Remove – Inspect the Air Filter

  1. Place the KX85 upright on a stand for stability.
  2. Remove the seat using the two 8 mm bolts located at the rear of the seat.
  3. Carefully unscrew the wing nut holding the filter & lift the foam filter out of the air box. Take care not to drop any debris into the air boot – plug the intake with a clean rag if needed.*
  4. Inspect the filter for excessive dirt, tears, or damage. Filters showing rips or compressed foam need replacement.

Cleaning the Air Filter

  1. Tap or gently brush the filter outside to remove loose dirt.
  2. Submerge in a bucket with filter cleaner or mild soap & warm water. Squeeze (do not wring or twist) to release old oil & dirt. Repeat until clean.
  3. Rinse thoroughly with clean water, squeeze again, & air dry completely (avoid heat sources).

Oil – Reinstall the Air Filter

  1. Saturate the clean, dry filter thoroughly with foam air filter oil. Work the oil evenly into the foam – every cell should be sticky but not dripping. A well-oiled filter traps dust best.*
  2. Optional: apply a thin bead of waterproof grease around the filter's base to seal against the airbox for extra protection.
  3. Remove the rag from the air boot, wipe out the airbox, & install the filteraligning the plastic frame correctly so the mounting post passes through the center.
  4. Secure with the wing nut snuglydon't overtighten as the base can crack.
  5. Reinstall the seat & bolts.

Replacement – Service Intervals

  • Replace the filter if foam is torn, degraded, or if the filter doesn't spring back to shape after cleaning.
  • Clean & oil the filter after every ride in dusty conditions, or every 2–3 rides in mild environments.*
  • Consider keeping a spare filter to swap while one dries.

KX85 Owner Notes

  • The 2019 KX85 uses a standard foam air filter held by a wing nut design for tool-less removal after the seat is off, streamlining maintenance.*
  • Always inspect the airbox for dirt after filter removal. Even small debris can cause engine scoring.
  • The KX85 is engineered for youth racing, so frequent filter maintenance is crucial for hard riding & high RPM use.

Pro Tip

Pre-oil multiple filters – keep them sealed in bags for quick swaps on race day or after tough rides.

*KX85 filter maintenance steps summarized from typical Kawasaki 2-stroke procedures confirmed by technical walk-throughs for similar KX models in current online content.

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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.