How To Change The Oil In A 2003 Kawasaki KLX110

Shop parts for a 2003 Kawasaki KLX110 Dirt Bike.

Maintaining your 2003 Kawasaki KLX110 by performing regular oil changes is one of the most essential ways to keep your engine healthy and reliable. This straightforward DIY job can save you money and help you develop a deeper understanding of your dirt bike. Below, MotoSport.com provides a step-by-step guide, highlighting all model-specific tips you'll need for your KLX110.

Tools and Materials Needed

  • 3/8-inch ratchet and extension
  • 8mm, 12mm, 17mm sockets
  • Torque wrench
  • Oil drain pan
  • New engine oil (typically 10W-40 or as specified in your owner’s manual)
  • Funnel
  • Crush washer (replacement recommended)
  • Clean rags
  • Disposable gloves (optional for cleanliness)

Model-Specific Note: 2003 Kawasaki KLX110

  • Your oil filter is internal and should only be removed/cleaned every other oil change unless your oil appears particularly dirty.
  • Early KLX110s, like the 2003, have simple access and do not require plastics removal, but do have a skid plate that must come off to reach the drain bolt.
  • Always double-check your oil capacity in your owner’s manual—overfilling can cause engine issues.

Step-by-Step Oil Change Guide

  1. Warm Up The Engine
    • Start the engine and let it idle for 2-3 minutes. This warms up the oil, allowing it to flow and drain more completely.
    • Be careful: After warming up, exhaust components will be hot.
  2. Remove The Skid Plate
    • Using your 8mm socket, remove the bolts on each side of the skid plate.
    • Then use a 12mm socket to remove the two rear bolts behind the skid plate.
    • Set the skid plate and fasteners aside.
    • For stock 2003 KLX110 models, the skid plate is required to be removed for direct drain plug access.
  3. Remove The Oil Fill Cap
    • Unscrew the oil fill cap on top of the right side of the engine to allow proper draining.
  4. Drain The Old Oil
    • Place your oil drain pan directly under the 17mm drain bolt (bottom of the engine, exposed after skid plate removal).
    • Using the 17mm socket and ratchet, loosen and completely remove the drain bolt. Allow the oil to drain fully.
    • Check the drain bolt’s crush washer–replace it if it appears worn or damaged.
  5. Optional: Clean/Replace The Oil Filter
    • For the 2003 KLX110, the oil filter is a simple mesh screen located inside. Remove it only every other oil change as needed.
    • If you choose to inspect, pull the screen with a pick, clean thoroughly, and reinstall.
  6. Reinstall The Drain Plug
    • After oil stops dripping, reinstall the drain bolt with the new (or good) crush washer.
    • Tighten with your torque wrench to manufacturer specifications (typically around 14 ft-lbs; always confirm with your manual).
  7. Refill With New Oil
    • Insert a funnel into the oil fill hole.
    • Pour in new engine oil. For the 2003 KLX110, start with 0.9 quarts (0.85 liters), then check and top off as needed

      .
  8. Check Oil Level
    • Let the bike stand upright (not on the kickstand) and check the oil level with the dipstick or sight glass.
    • The oil should fall between the high and low marks.
    • Add oil if needed; avoid overfilling.
  9. Reinstall Skid Plate
    • Secure your skid plate with the previously removed 8mm and 12mm bolts.
    • Make sure everything is tightened to spec.
  10. Run The Engine And Final Check
    • Start the engine and let it idle for a minute.
    • Check for leaks around the drain plug and oil filter area. If all is well, shut off the bike and re-confirm oil level, topping off if necessary.

Important Reminders For The 2003 KLX110

  • Always use motorcycle-specific oil for wet clutches (like the one in your KLX110).
  • Dispose of used oil responsibly at a recycling center or auto parts store.
  • Inspect your oil for metallic debris or discoloration, which may be warning signs of internal engine issues.
  • Change your oil regularly—every 6 months or 50 hours of use, whichever comes first, or more if you ride in dirty or extreme conditions

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By following these steps, your 2003 Kawasaki KLX110 will continue running strong and trouble-free. For all your maintenance parts and service tools, trust MotoSport.com for fast shipping and expert service.

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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.