Air Filter Cleaning – Replacement Guide for 2019 Kawasaki KLX140G

Shop parts for a 2019 Kawasaki KLX140G Dirt Bike.

The 2019 Kawasaki KLX140G is built with a reliable, air-cooled four-stroke engine that thrives on proper, routine air filter maintenance. A clean, well-oiled air filter is crucial for engine longevity – a neglected filter puts your dirt bike at risk for accelerated wear, loss of performance, and expensive repairs. This guide, brought to you exclusively by MotoSport, details the proprietary process for maintaining and replacing the KLX140G air filter, complete with important model-specific notes for owners.

How Often to Clean or Replace Your Air Filter

  • Clean initially after the first 5 hours or one month of riding.
  • After the first service, clean the filter every 50 hours or 6 months, whichever comes first.
  • If you ride in dusty or muddy conditions, clean much more frequently. Replace at the first sign of damage, tears, or deformation to ensure optimal engine protection.–

Essential Tools & Supplies

  • Gloves
  • Clean, lint-free cloths
  • High flash-point solvent or specifically formulated air filter cleaner
  • High quality foam air filter oil
  • All-purpose grease
  • Replacement air filter (MotoSport recommends genuine or performance-grade options for your KLX140G)

Air Filter Removal (2019 KLX140G)

  1. Remove the left side panel to access the air box.
  2. Take off the air box cover to reveal the air filter.
  3. Carefully undo the wing bolt securing the air filter in place.
  4. Gently extract the air filter and attached frame from the air box.

Proprietary MotoSport Air Filter Cleaning Process

  1. Separate the foam element from the plastic frame.
  2. Clean the air box interior using a damp cloth – do not introduce water or cleaner into the intake tract.
  3. Inspection: Carefully check the entire foam filter for visible damage, holes, or signs of deterioration. Replace immediately if any defect is found.
  4. Wash the foam element in a dedicated solvent or air filter cleaner, gently squeezing (never wringing or twisting) until all debris and old oil is removed.
  5. Press out excess liquid with a clean towel. Air dry the filter – avoid heat sources or compressed air which can damage the foam structure.
  6. Evenly saturate the dry foam element with a high-quality foam filter oil. Work oil through by hand – the filter must be completely coated but not dripping. Squeeze out excess in a clean towel, maintaining even distribution.

Re-Installation for a Perfect Seal

  1. Reattach the filter to the internal frame.
  2. Apply all-purpose grease to all sealing edges of the filter and air box. This step is essential for the KLX140G, whose air box requires a complete barrier to avoid bypass. Any gaps or missed grease can lead to dirt ingestion and poor running.
  3. Install the filter assembly into the air box. Secure with the wing bolt, confirming the filter's lip is evenly sealed and the cage is compressing the filter securely;
    there should be no visible gaps.
  4. Reinstall the air box cover and left side panel.

Model-Specific Notes for 2019 Kawasaki KLX140G Owners

  • The large air box volume on the KLX140G is excellent for engine breathing, but any leaks around the filter seal result in audible whistling or fluttering sounds and potential dust entry. Always check the seal after installation.
  • KLX140G filters include a unique backfire screen. Do not attempt to remove this screen. Be cautious when cleaning near the intake to avoid pushing debris into the carburetor.
  • The wing bolt and filter cage design is simple but requires proper orientation: the flat side of the plastic spacer faces outward. If reversed, the seal will be incomplete.
  • Always use high quality foam filter oil, as thinner alternatives may allow fine dust to bypass the element, especially on longer rides.
  • Replacing a damaged or worn filter is easy with direct-fit OEM and aftermarket options at MotoSport.

When to Replace the Air Filter

  • Visible damage, tears, hardening or collapse of the foam.
  • Heavy discoloration or persistent dirt build-up after cleaning.
  • Filter no longer fits snugly against the air box, compromising the seal.

With routine filter maintenance and periodic replacement, your 2019 KLX140G is prepared for peak performance and long engine life on any trail. MotoSport stands behind these exclusive service protocols to help every rider maintain confidence and get the most from their machine.

Related Shopping Categories

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Shop Intake Parts for a 2019 Kawasaki KLX140G Dirt Bike.

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.