How to Change the Oil in a 2020 Kawasaki KX450: Complete Step-by-Step Guide

Shop parts for a 2020 Kawasaki KX450 Dirt Bike.

Keeping your 2020 Kawasaki KX450 running in top condition means regular oil changes—one of the most essential maintenance tasks for any dirt bike owner. This detailed guide, proprietary to MotoSport.com, will cover everything from the tools you need, to model-specific tips, so you can confidently tackle this task whether you're at home or trackside.

Tools and Materials Needed

  • 8mm socket (for oil filter cover bolts)
  • 12mm socket (for oil drain bolt)
  • Socket wrench and extensions
  • Large flathead screwdriver
  • Torque wrench (for reinstalling bolts to spec)
  • Oil filter (K&N KN-207 or equivalent)
  • 1 quart (0.95L) of 10W-40 full synthetic motorcycle oil
  • New crush washer for drain bolt
  • Oil catch pan
  • Funnel
  • Gloves and shop towels
  • Optional: angled pick (to help remove the old filter)

Preparation and Model-Specific Callouts

  • Model Note: 2019–2023 Kawasaki KX450 models share virtually identical procedures and specs.
  • Oil capacity is just under one quart (check manual for exact volume).
  • The KX450 uses a cartridge oil filter located behind a small side cover held by 8mm bolts.
  • The oil level sight glass can fluctuate in appearance based on engine speed and bike position—refer to the end of this guide for proper checking method.
  • If your bike has a skid plate installed, you'll likely need to remove it for direct drain plug access, as oil can otherwise spill onto the skid plate and make a mess.

Step-by-Step Oil Change Instructions

  1. Warm Up the Engine:
    • Start the engine and let it idle for 2–3 minutes. This warms up the oil, helps suspend particles, and ensures thorough draining.
    • Turn off the engine and secure the bike in a vertical, upright position using a bike stand.
  2. Remove Skid Plate (if equipped):
    • Use the appropriate tool to remove the skid plate, if installed, for full access to the drain bolt.
  3. Drain Old Oil:
    • Locate the 12mm oil drain bolt underneath the engine.
    • Place the oil catch pan beneath, then carefully loosen and remove the bolt.
    • Allow all old oil to drain out. Inspect the old crush washer; replace it with a new one if worn.
    • Once fully drained, reinstall the drain bolt with a new crush washer. Tighten to factory torque specification (consult your manual, generally about 18 ft-lbs).
  4. Remove and Replace Oil Filter:
    • Locate the oil filter cover—typically on the right side of the engine.
    • Remove the 8mm bolts securing the oil filter cover.
    • Carefully take off the cover. Use an angled pick if needed to remove the old cartridge filter.
    • Inspect the filter cover O-ring; replace it if damaged.
    • Install the new oil filter (K&N 207 or equivalent), ensuring proper orientation.
    • Reinstall the cover and gently tighten the 8mm bolts, following a criss-cross pattern and the proper torque (usually about 7–8 ft-lbs).
  5. Add Fresh Oil:
    • Using a funnel, add approximately one quart (0.95L) of 10W-40 full synthetic motorcycle oil through the oil filler opening.
    • Replace the filler cap securely.
  6. Start and Check for Leaks:
    • Start the engine and let it idle for about a minute, then shut it off.
    • Check around the oil filter cover and drain bolt for leaks.
    • Allow the oil to settle for a couple of minutes.
  7. Check Oil Level:
    • With the bike upright and level, look at the oil sight glass located on the engine side case.
    • The oil should be between the upper and lower markings. If low, add oil in small increments and re-check.
    • Special tip: On the KX450, the oil sight glass can show different readings based on engine position. After warm up, let the bike sit upright and idle for a moment, then turn it off and wait a few minutes for settling before you check the level for the most accurate reading.

KX450 Model-Specific Tips

  • Always use the correct filter model (KN-207 or approved equivalent) for optimal fit and performance.
  • Change the oil every 15 hours of riding or every 6 races, whichever comes first. For hard or sandy riding, consider more frequent changes.
  • If you ride in extreme dust or mud, clean around the oil fill and drain area before removing any parts to avoid debris entering the engine.

Disposal and Final Thoughts

  • Properly dispose of used oil and filters at an approved recycling facility—never pour oil on the ground or into household drains.
  • Keep a record of your oil change intervals for warranty and maintenance planning.

With this step-by-step guide, MotoSport.com ensures you have all the know-how to keep your 2020 Kawasaki KX450 running smoother and longer with every oil change. Happy riding.

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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.