How to Change the Oil in a 2022 Kawasaki KLX140R F 21/18

Shop parts for a 2022 Kawasaki KLX140R Dirt Bike.

An oil change is a crucial maintenance step that keeps your Kawasaki KLX140R F running strong and extends engine life. This straightforward job can be handled at home with basic tools and a bit of know-how. Below you'll find the MotoSport.com proprietary guide with all tools required, step-by-step directions, and important model-specific callouts for the 2022 KLX140R F 21/18.

Tools & Supplies Needed

  • 3/8” ratchet and extensions
  • 8mm and 17mm socket
  • Torque wrench (for reinstalling drain bolt to spec)
  • Oil drain pan
  • Oil filter (OEM Kawasaki recommended, part: 52010-1053)
  • New oil drain plug gasket–crush washer (Kawasaki part: 11061-0421)
  • 4-stroke motorcycle engine oil 10W-40 (1 quart is typically enough—the spec is 0.95 quarts with filter change)
  • Clean rags
  • Funnel (recommended for easier fill)
  • Brake cleaner (optional, for cleaning messes)

Step-by-Step Oil Change Instructions

  1. Warm up your engine.
    Start your bike and let it idle for a minute or two. Warming the oil helps it drain out thoroughly and removes more contaminants from your engine.
    Why: Warm oil drains faster and pulls more old oil and residue with it.
  2. Place the bike securely and prep work area.
    Use a stand or flat surface to keep the bike upright and steady. Place your drain pan under the lower left side of the engine, just below the drain bolt.
  3. Remove the dipstick.
    Unscrew and remove the dipstick/fill cap from the right side of the engine. This allows airflow and makes the oil drain more completely.
  4. Drain the old oil.
    Using a 17mm socket, loosen and remove the drain bolt and old gasket–crush washer from the lower left side of the crankcase. Allow oil to fully drain. Inspect the old drain plug and gasket for wear or metal shavings.
  5. Replace the oil filter.
    Locate the oil filter cover (circular, right-side engine, held with 8mm bolts). Remove the bolts and remove the cover. Take out the old oil filter. Clean the cover and install a brand-new oil filter in the correct orientation.
    Double-check that the spring (if fitted) is seated correctly behind the filter.
  6. Install a new drain plug gasket and reinstall the drain bolt.
    Always use a fresh crush washer–gasket to prevent leaks. Torque the drain bolt to manufacturer specifications (≈22 ft-lb).
  7. Fill with fresh oil.
    Using a funnel, pour 0.95 quarts of 10W-40 motorcycle oil into the fill port. Avoid overfilling.
  8. Check the oil level.
    Insert the cleaned dipstick and screw it all the way in, then remove to check the oil level. Add oil as needed until the oil is at the correct mark—do not overfill.
    Note: On the KLX140, oil should be checked with the dipstick screwed all the way in, not just sitting on top of the threads.
  9. Reinstall the dipstick and wipe down.
    Screw the dipstick back into place. Clean up any spilled oil and dispose of old oil properly.
  10. Start the engine and recheck for leaks.
    Let the bike run for a minute, then shut it off and check around the drain bolt and filter cover for leaks. Recheck the oil level after the bike sits for a few minutes, top off if needed.

Model-Specific Callouts for the 2022 KLX140R F 21/18

  • Drain Bolt Position: The KLX140 series bikes—including the 21/18-wheel layout (R F model)—have the drain bolt at the lower left side of the crankcase.
  • Oil Quantity: Use 0.95 quarts with filter change—check the level with dipstick screwed all the way in for an accurate reading.
  • Gasket–Oil Filter: Replace the oil drain gasket–crush washer at every oil change. Use an OEM-style oil filter for best results.
  • No significant mechanical changes: The oil change procedure for the KLX140R F remains consistent for models 2010–2024 as there were no major engine changes reported.
  • Engine: The KLX140R F uses a simple, air-cooled 144cc four-stroke engine that is robust, but regular oil changes are key to longevity.

Final Tips and Precautions

  • Always verify the correct oil level after the engine has run and the bike has cooled. Too little or too much oil can cause engine problems.
  • Use motorcycle-specific oil, not automotive oil—friction modifiers in car oils can affect your wet clutch performance.
  • Dispose of old oil and filter at an approved recycling center.
  • Consult your owner—s manual for torque specs and maintenance intervals.

By following this guide, you’ll extend the life of your 2022 Kawasaki KLX140R F and ride with confidence both on and off the track.

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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.