How to Change the Oil in a 2019 Kawasaki KX450: A MotoSport.com Guide

Shop parts for a 2019 Kawasaki KX450 Dirt Bike.

Regular oil changes are essential to keep your 2019 Kawasaki KX450 running strong, maximizing engine life, and maintaining optimal performance on and off the track. Below is a detailed, proprietary guide from MotoSport.com—crafted specifically for KX450 owners—highlighting the exact tools, step-by-step instructions, and critical model-specific notes for your maintenance routine.

Tools & Supplies Needed

  • Large flathead screwdriver
  • Torque wrench
  • Socket wrench
  • Socket extensions
  • 8mm socket
  • 12mm socket
  • Angled pick
  • Oil drain pan
  • Funnel
  • Gloves
  • Stool (to support bike upright)
  • 10W40 full synthetic motorcycle oil (one quart)
  • New oil filter (KN-207 or equivalent)
  • New crush washer
  • Clean shop towels or rags

Model-Specific Call-Outs for 2019 Kawasaki KX450 Owners

  • Oil Change Interval: Change the oil and filter every 15 hours of riding or six races, whichever comes first.
    Tip: Dirty, dark, or contaminated oil can accelerate engine wear.
  • Oil Inspection Window: The KX450 uses an inspection window to check oil level, and it may read differently based on the bike’s position and engine speed when shut off. Always check oil with the bike upright and on level ground after letting the engine sit for a few minutes.
  • Drain Bolt Location: There is a dedicated hole in the skid plate for the drain plug. Removing the plate (if equipped) prevents oil from splashing and provides cleaner access. Some aftermarket skid plates may not align perfectly, potentially causing oil to spill—remove the plate if uncertain.
  • Torque Specs: Drain bolt: 10 N·m (89 in-lb). Oil filter cover: 12 N·m (106 in-lb).
  • Oil Filter Orientation: Ensure filter is installed with the writing "this side toward engine" facing the correct direction for proper flow.

Step-by-Step Oil Change Procedure

  1. Warm Up the Bike
    • Start your KX450 and let it idle for 3–5 minutes. This allows the oil to warm and flow more freely, ensuring contaminants are suspended in the oil and drained out.
  2. Stabilize the Bike
    • Turn off the engine and use a stand or stool to keep the bike upright and level for accurate draining and refilling.
  3. Remove Skid Plate (if equipped)
    • Carefully remove any aftermarket or factory skid plate to avoid messy spills and access the drain bolt directly. Use the 8mm or 12mm socket as needed.
  4. Drain the Oil
    • Place the oil drain pan beneath the crankcase drain plug.
    • Use the 12mm socket to loosen and remove the drain bolt. Allow the oil to fully drain.
    • Remove the oil fill cap to speed up the draining process.
    • Replace the old crush washer with a new one to prevent leaks.
  5. Remove and Replace the Oil Filter
    • Use the 8mm socket to remove the bolts holding the oil filter cover.
    • Carefully remove the cover and O-ring. Extract the old filter using the angled pick if needed. Be cautious of residual oil.
    • Lubricate the O-ring with clean oil before reinstalling to prevent pinching. Install the new oil filter, oriented properly ("this side toward engine" facing inward).
  6. Reinstall Components
    • Reinstall the oil filter cover and torque bolts to 12 N·m (106 in-lb).
    • Reinstall the drain bolt and torque to 10 N·m (89 in-lb).
    • If previously removed, reinstall the skid plate.
  7. Refill with Oil
    • Using a funnel, pour in approximately 1 quart (just under 1 liter) of 10W40 full synthetic motorcycle oil. For racing or hard riding in extremely hot conditions, consult your owner’s manual or MotoSport.com expert for specific oil grades.
  8. Start the Bike and Check for Leaks
    • Run the engine for 1–2 minutes. Shut off and inspect for leaks around the filter cover and drain bolt.
  9. Check Oil Level Through Inspection Window
    • Wait a few minutes with the bike upright to allow oil to settle. The oil should sit between the upper and lower lines of the sight glass.
    • Add or remove oil as necessary.
  10. Dispose of Old Oil Responsibly
    • Take the used oil and filter to a recycling center or auto parts store with a recycling program.

Additional Pro Tips for KX450 Owners

  • Never overfill: Overfilling can cause frothing, poor lubrication, or damage.
  • Keep a maintenance log for intervals—it’s easy to lose track when riding frequently.
  • Inspect the magnetic drain plug for excessive metallic debris; large shavings may mean internal wear that requires further inspection.
  • Always keep extra crush washers and an oil filter in your toolbox for quick maintenance before race day.

Following this MotoSport-exclusive procedure guarantees clean, proper lubrication, and long-lasting reliable performance for your 2019 Kawasaki KX450. 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.