Air Filter Cleaning & Replacement Guide for 2014 Kawasaki KLX140

Shop parts for a 2014 Kawasaki KLX140 Dirt Bike.

Keeping the air filter clean and in optimal condition is essential for peak performance and engine life on your 2014 Kawasaki KLX140. This MotoSport.com guide walks you through proprietary steps for air filter cleaning – and when replacement makes sense – tailored to the unique needs of the KLX140.

Why the KLX140 Air Filter Matters

The KLX140 uses a foam air filter design, critical for trapping dust and debris common on trails. A clogged or neglected filter risks engine damage. Kawasaki recommends inspecting and cleaning the filter initially after the first 5 hours or one month of use, then every 50 hours or 6 months thereafter – or more frequently if you ride in dusty environments and mud .

How to Remove and Inspect the Air Filter

  • Remove the left side cover using an 8mm wrench to access the air box.
  • Unscrew the air box cover – it has four 8mm bolts .
  • Take out the air filter by loosening and removing the wing bolt.
  • Carefully separate the filter element from its frame.

MotoSport Cleaning Procedure

  • Clean inside the air box using a damp, lint-free cloth – never let dirt get into the clean side or carburetor.
  • Wash the foam element in a bath of high flash-point solvent or hot soapy water. Avoid gasoline and low flash-point solvents – they can be hazardous .
  • Squeeze the filter dry in a clean towel. Do not wring out the filter or use compressed air, as this can damage it .
  • Check for visible damage, cracks, or deterioration. Replace the filter if compromised.
  • Fully saturate the clean filter with high-quality foam filter oil. Squeeze out excess oil until the filter is moist but not dripping .
  • Apply a thick layer of all-purpose grease on the filter lip and lip seat for a perfect seal.
  • Reinstall the filter, secure the wing bolt, attach the air box cover, and lock the side panel.

When to Replace the Air Filter

  • Replace the filter immediately if you notice tears, stiffness, breakdown of foam, or excessive clogging.
  • The KLX140 supports aftermarket filters such as Twin Air, which feature dual-stage open-pore foam construction for superior filtration and airflow .

KLX140-Specific Notes

  • The KLX140 airbox has a single air intake snorkel – this typically causes one area of the filter to get dirtier than others. Inspect thoroughly and rotate cleaning focus to this spot.
  • All KLX140 model years share a similar air filter layout and procedure, including the 2014 version.
  • Always ensure the rubber grommets and seals remain on the bike frame when removing covers, to prevent air leaks.

Tips for Longevity

  • Clean and oil your filter after every 2-3 rides in dusty or extreme conditions for maximum engine protection .
  • If using aftermarket filters, make sure they match factory specifications for fit and airflow .
  • Never neglect the sealing surfaces – use quality grease for complete protection.

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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.