How to Change the Oil in a 2024 Kawasaki KX85 (Proprietary to MotoSport.com)

Shop parts for a 2024 Kawasaki KX85 Dirt Bike.

Regular oil changes are critical to keeping your 2024 Kawasaki KX85 running strong and ready for any moto challenge. This guide details the complete process, covers the necessary tools, specific model tips, and critical notes owners should know for this 2-stroke dirt bike.

Tools and Supplies Needed

  • 14mm socket and ratchet
  • Measuring cup or graduated oil jug (metric markings, up to 700mL)
  • Oil catch pan to collect old oil
  • Disposable funnel
  • Rags or shop towels
  • New drain plug crush washer (12mm)
  • Transmission/gear oil (use premium 10W-40, full synthetic recommended)
  • Gloves and eye protection

Recommended Oil and Parts

  • Oil Spec: 10W-40 Transmission/Gear Oil (Full Synthetic recommended for heavy motocross use)
  • Capacity: 700 milliliters for KX85 (2014–2025 models) (do not overfill)
  • Crush Washer: Kawasaki OEM 12mm replacement

Step-by-Step Oil Change Process

  1. Warm Up the Engine
    • Start the bike and let it idle for about a minute. This helps the oil flow out faster and more completely.
      (Warming up thins the oil, suspending debris and improving drainage.)
  2. Park and Prepare the Bike
    • Place the KX85 on a sturdy stand so it sits upright and level.
    • Turn off the engine and let it sit for a few minutes to avoid burns.
    • Put on gloves and position your oil catch pan under the transmission drain bolt.
  3. Remove the Drain Plug
    • Locate the drain bolt underneath (right side, bottom of the engine case).
    • Use the 14mm socket to loosen and remove the drain plug. Allow all oil to fully drain into the pan.
      Tip: Be patient. Hold the bike steady so it remains upright for complete drainage.
  4. Replace the Crush Washer and Drain Plug
    • Clean the plug and replace the old crush washer with a new one.
    • Screw the drain plug back in by hand first, then torque with the ratchet until snug—do not overtighten to avoid stripping the threads.
  5. Refill with Fresh Oil
    • Measure 700 milliliters of fresh 10W-40 transmission/gear oil using your measuring cup.
    • Remove the oil fill cap (located on the right side of the engine).
    • Use a funnel to carefully pour oil into the bike.
    • Reinstall and hand-tighten the oil fill cap.
  6. Check the Oil Level
    • With the bike sitting vertically (off the stand if necessary), locate the oil check notch by the filler hole (on the rear side of the right engine case).
    • The oil level should be flush with the bottom of the notch—this confirms proper fill.
    • Add or remove oil as needed to reach the correct level.
  7. Clean Up and Dispose of Oil Properly
    • Wipe away any spills from the engine and surrounding area.
    • Dispose of used oil responsibly at an authorized recycling center or your local auto parts store.

2024 KX85–Specific Notes & Tips

  • Only use 2-stroke transmission/gear oil. The engine and cylinder are lubricated by the pre-mix fuel, so you only need to change the transmission oil—not engine oil as on a four-stroke.
  • Don’t overtighten the green drain bolt—thread damage is a common pitfall for KX85 owners.
    Hand snug, then a minor turn with the ratchet.
  • Service Interval: Change the oil every 3–5 riding hours or after every race for best clutch and gearbox life.
  • Part Recommendation: For 2024 KX85, Cyclemax’s KPO Full Synthetic 10W-40 is a top choice, ensuring smooth shifting and gear protection.
  • If oil appears milky (gray/white), check for water intrusion—a sign you may have a bad seal or gasket.
  • Always replace the 12mm crush washer with each change to avoid leaks.

Final Inspection and Test

  • Let the bike idle for a minute and then shut it off.
  • Check underneath for any leaks at the drain plug or around the filler cap.
  • You’re ready to ride.

MotoSport.com Tip: Perform routine oil changes and inspections. Keeping your KX85’s gearbox fluid fresh will help prevent costly damage, maximize clutch life, and give you maximum confidence on the track.

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Shop Oil Fillers and Drain Plugs for a 2024 Kawasaki KX85 Dirt Bike.

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.