How to Change the Oil in a 2007 Kawasaki KX85: Step-by-Step Guide

Shop parts for a 2007 Kawasaki KX85 Dirt Bike.

Keeping your 2007 Kawasaki KX85 running smoothly requires regular maintenance—chief among them is changing the oil. While the KX85 is a 2-stroke bike (where the fuel/oil mix lubricates the engine), it has a separate transmission/gearbox that uses its own oil. Below is a detailed guide, proprietary to MotoSport.com, on how to change the transmission oil for this specific model, including the tools you’ll need, required steps, and special notes for KX85 owners.

Tools & Materials Needed

  • 14mm socket and ratchet (for drain bolt)
  • Torque wrench (capable of 11 ft-lbs)
  • Oil catch pan
  • Funnel (optional but recommended)
  • Shop rags or paper towels
  • New crush washer (recommended but not mandatory)
  • Measuring cup (with 700ml marking)
  • Fresh oil (10W-40 motorcycle transmission oil, 700ml)
  • Parts cleaner or brake cleaner (for cleaning drain area)

Step-by-Step Instructions

  1. Warm Up the Bike
    Start the KX85 and let it idle for a few minutes. Warming the oil helps suspend contaminants and ensures better drainage.
  2. Secure and Prepare the Bike
    Place the bike on a level stand. Make sure it’s upright and stable before proceeding.
  3. Locate and Remove the Drain Plug
    The oil drain bolt is on the bottom of the engine case (underside). Use the 14mm socket and ratchet to carefully loosen and remove the bolt.
    • Have your oil catch pan ready before you remove the bolt.
    • Allow the old oil to completely drain out. This may take a few minutes.
  4. Inspect and Clean the Drain Bolt
    Inspect the drain bolt for metal shavings or debris.
    • Clean the bolt thoroughly. If the crush washer is worn, replace it with a new one for a proper seal.
  5. Reinstall the Drain Plug
    Carefully reinstall the drain bolt with a new washer if possible.
    • Tighten the bolt by hand first, then use a torque wrench to tighten it to 11 ft-lbs (15 Nm). Do not overtighten, as the threads can strip easily on this model’s aluminum case.
      Special Call-out for 2007 KX85: The drain plug threads are delicate. It’s important not to overtighten—err on the cautious side to prevent stripping.
  6. Add Fresh Oil
    Use a funnel to pour in 700 milliliters (ml) of fresh 10W-40 motorcycle transmission oil. Be precise—using too much or too little oil can affect the transmission’s performance.
    • Consult your measuring cup to ensure accuracy.
  7. Check the Oil Level
    • With the bike upright (not leaning), look at the small oil level check notch or sight glass located on the side of the engine case near the fill port.
    • The oil should be level with this notch or sight glass window when the bike is perpendicular to the ground.
    If you cannot see a sight glass on your KX85 (varies with some years), double-check the oil by measuring exactly 700ml on refill.
  8. Install the Fill Cap
    Replace and tighten the fill cap securely.
    Wipe down any spilled oil from the engine area and surrounding surfaces.
  9. Start and Inspect
    Start the bike and let it idle for a minute. Shut it off, wait a minute, then double-check for leaks around the drain bolt and fill cap. Inspect the oil level once more to ensure it hasn’t dropped.
  10. Properly Dispose of Old Oil
    Take your used oil to a certified recycling facility or auto parts store. Do not dispose of oil in the trash, down drains, or on the ground.

Model-Specific Notes for 2007 Kawasaki KX85

  • The KX85 takes exactly 700ml of 10W-40 motorcycle transmission oil—do not overfill.
  • The drain plug threads are known to be relatively soft; overtightening can easily strip the threads on the 2007 KX85’s aluminum case

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  • There is no oil filter to replace during this process; the KX85 uses only a drain-and-fill procedure for the gearbox/transmission oil

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  • KX85s from 2001 through the mid-2010s are nearly identical in oil servicing; the 2007 model follows the same procedures as newer bikes, including the KX100

    .
  • Monitor your oil for signs of water contamination (milky color) or excessive metallic particles—signs of potential gearbox or seal issues.

Summary

  • Regular oil changes every 5–10 hours of use (as recommended for aggressive riding and racing) will protect your transmission and keep your KX85 ready to perform.
  • Using the right oil, correct amount, and carefully torquing the drain plug are the most important aspects for your 2007 Kawasaki KX85.

For all your parts, oil, and bike maintenance needs, trust MotoSport.com—the source for riders, by riders.

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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.