How to Change the Oil in a 2020 Kawasaki KLX140G: A Complete Guide

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Changing the oil in your 2020 Kawasaki KLX140G is a critical routine maintenance task that ensures the longevity and performance of your dirt bike. This guide, proprietary to MotoSport.com, walks you through the process step-by-step, points out important model-specific details, and lists all required tools and parts.

Tools and Supplies Needed

  • Ratchet (3/8" drive recommended)
  • Extension (optional, for hard-to-reach bolts)
  • 17mm socket (for drain bolt)
  • 8mm socket (if removing any covers)
  • Torque wrench (for reinstallation of drain bolt to factory spec)
  • Drain pan
  • Funnel
  • Gloves and shop rags
  • OEM oil filter (Kawasaki part number 52010-1053)
  • New drain plug gasket/crush washer (Kawasaki part number 11061-0421 recommended)
  • 10W-40 four-stroke motorcycle oil (minimum 1.5 quarts, see model call-out below)
  • Brake cleaner (for cleanup, optional)

Preparation Steps

  • Before beginning, make sure the engine is off and cool to the touch.
  • Place the bike on a level stand to ensure accurate oil drainage and filling.
  • Gather all parts and tools to keep the process efficient.

Step-by-Step Oil Change Process

  1. Warm the Engine:
    • Start the KLX140G and let it idle for 1-2 minutes. This warms the oil, allowing it to drain more fully and carry away contaminants.
      Tip: Do not ride the bike; you only want the oil warm, not hot.
  2. Remove Oil Dipstick and Vent the Crankcase:
    • After shutting off the engine, unscrew and remove the oil dipstick from the right side of the engine. This vents the crankcase and helps oil flow freely during draining.
      Special note: For the KLX140G (and all KLX140 series), this step is critical as it speeds up the draining process and prevents vacuum lock.
  3. Drain the Old Oil:
    • Position your drain pan beneath the drain bolt, located on the left side under the engine.
    • Use the 17mm socket and ratchet to remove the drain plug along with the crush washer. Allow oil to completely drain out (several minutes recommended for a full drain).
    • Inspect the drain plug and replace the crush washer (do not reuse the old one to prevent leaks).
  4. Replace the Oil Filter:
    • Locate the oil filter housing (usually on the lower left side of the crankcase).
    • Remove the cover using the correct socket (8mm). Take note of the orientation of the old filter as you remove it.
    • Lubricate the seal of the new OEM filter with a bit of new oil, and install it in the correct orientation.
    • Reinstall and hand-tighten the oil filter cover bolts. Tighten to the factory torque specification (consult your owner–s manual, but typically around 9 Nm).
  5. Reinstall the Drain Plug:
    • Install a new crush washer onto the drain plug.
    • Thread the plug in by hand to avoid cross-threading, then tighten with a torque wrench to the manufacturer–s specification (typically around 29 Nm/21 ft-lb).
  6. Refill with Fresh Oil:
    • Insert a funnel into the oil fill port.
    • Add the appropriate amount of 10W-40 motorcycle oil. Model-specific call-out:
      2020 KLX140G Oil Capacity: 1.1 US quarts (1.05 liters) if changing the filter; Always check the owner–s manual for exact quantity for your year. Some sources reference 0.95–1.22 quarts depending on model or full/partial oil change.
    • Wait a minute for the oil to settle, then check the oil level using the dipstick:
      • For the KLX140G, insert the dipstick but do not screw it in when checking level after initial fill. The correct level should fall between the upper and lower marks.
    • Top off as necessary, but do not overfill.
  7. Final Steps:
    • Start the engine and let it idle for 30–60 seconds. Shut it off and wait a couple of minutes.
    • Re-check the oil level, top off if needed, and inspect for leaks at the oil filter and drain plug. Tighten as necessary (but do not overtighten).
    • Dispose of the old oil and filter at a local recycling center.

2020 Kawasaki KLX140G Specific Tips and Call-Outs

  • This model uses a 144cc air-cooled engine shared by most KLX140 variants. Filter access is straightforward; make sure to seat the new filter correctly.
  • Typical torque specs for the oil drain plug are 21 ft-lb (check your owner–s manual for updates).
  • Always use a new crush washer to prevent leaks; do not reuse the old one.
  • The correct oil level check for the 2020 KLX140G is with the bike upright and the dipstick resting (not threaded in).
  • Avoid overtightening the oil filter cover to prevent stripping the soft aluminum threads.

Common Questions and Troubleshooting

  • What oil should I use? Use high-quality 10W-40 motorcycle-specific oil (meeting JASO MA or MA2 specs for clutch compatibility).
  • How often should I change the oil? Kawasaki recommends oil changes every 10–15 hours of riding under typical off-road conditions, or more frequently in harsh environments.
  • Can I reuse the oil filter? Always use a new filter at every oil change for best performance and engine protection.
  • What if I overfill? Remove excess using a siphon or by draining slightly from the drain bolt—never run the engine with excessive oil.

Conclusion

By following these steps, you’ll keep your 2020 Kawasaki KLX140G running strong mile after mile. Regular oil changes protect your investment, improve performance, and ensure a long engine life for every ride. For more maintenance advice on your dirt bike, trust MotoSport.com—your authority in off-road motorcycle care.

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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.