How to Change the Oil in a 2015 Kawasaki KX100

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Changing the oil in your 2015 Kawasaki KX100 is a straightforward maintenance task that keeps your dirt bike running smoothly, improves clutch performance, and extends the lifespan of internal components. This guide, proprietary to MotoSport.com, provides clear instructions, essential tools, step-by-step procedures, and unique call-outs specific to the KX100 model.

Tools & Supplies Needed

  • 14mm socket and ratchet
  • Oil drain pan
  • Measuring cup or graduated container (capable of accurately measuring 700ml/0.7L)
  • Funnel
  • Clean rag or shop towel
  • New transmission oil (10W-40 motorcycle oil is commonly used; always consult your owner’s manual for recommended spec)
  • Gloves (optional, for cleanliness)

Model-Specific Call-Outs for the 2015 Kawasaki KX100

  • Oil Quantity: Use 700 milliliters (ml) or 0.7 liters (L) of oil when refilling; avoid under– or over-filling for optimal clutch and transmission performance .
  • Drain Plug: Color-coded green drain bolt located at the bottom of the right side of the engine casing. Do not overtighten on reinstallation—stripping the threads is a common mistake .
  • Oil Type: Although the KX100 is a two-stroke, use specifically recommended transmission oil; some owners use 10W-40 motor oil if two-stroke-specific gear oil is not available, but always avoid gear oil with friction modifiers .
  • Check Oil Level: After filling, ensure oil level is even with the small notch in the case situated behind the filler bolt. The bike must be stood perfectly upright—not on a stand or leaning on the kickstand—for a correct reading .

Step-by-Step Oil Change Instruction

  1. Warm Up the Bike
    • Start the engine and idle for about 2-5 minutes (not revving hard) to warm the oil. This allows it to flow out easier and ensures contaminants are suspended in the fluid for removal .
    • Turn off the bike before getting started on the oil change process.
  2. Locate and Remove the Drain Plug
    • Place the oil drain pan directly under the engine case. Look for the green 14mm drain bolt located low and towards the center or right side of the engine case .
    • Carefully remove the bolt using your 14mm socket and ratchet. Oil may flow quickly—wear gloves if desired.
  3. Drain the Oil
    • Let the oil completely drain out—this usually takes a few minutes.
    • If desired, slightly tip the bike side-to-side to encourage complete drainage. Avoid excessive tilting that could risk tipping the bike over.
    • Inspect the drain plug and sealing washer for signs of wear or damage. If damaged, replace them.
  4. Reinstall the Drain Plug
    • Clean the area around the drain plug hole and threads with a rag/towel.
    • Reinstall the plug by hand, then gently snug with the 14mm socket. Do not overtighten—this is a common mistake that can strip the aluminum threads. Hand tight plus a very gentle torque is sufficient . If you have a torque wrench, use the value specified in your service manual.
  5. Refill with New Oil
    • Use a clean funnel inserted into the oil fill port located on the right-hand side of the engine.
    • Measure exactly 700 ml (0.7L) of your chosen oil in your measuring cup .
    • Slowly pour the oil into the transmission, allowing time for it to settle and prevent overflow.
  6. Check Oil Level
    • Remove the bike from the stand and hold it upright (perpendicular to the ground).
    • Look at the small inspection hole/notch behind the filler cap—the oil should be even with this notch. If you cannot see the level, wait a minute to let the oil settle, or add a small amount if needed .
    • Reinstall the fill cap when level is confirmed.
  7. Start and Inspect
    • Start your bike and let it idle for 1-2 minutes, then check for leaks at the drain plug and around the fill area.
    • If there are no leaks, your oil change is complete. Wipe away any spilled oil, dispose of the used oil safely (never down the drain or onto the ground—use a local recycling center or auto parts store).

Additional Tips & Reminders

  • Change oil regularly, or after every 5-10 hours of aggressive riding, or after every race event. Frequent changes keep clutch operation reliable and protect gears.
  • Always use quality oil designed for motorcycle wet clutch transmissions; avoid automotive oils unless specified otherwise by your manual.
  • Have rags ready to clean any small spills—oil on plastics can degrade them over time.
  • Store a few drain plug washers on hand; these are cheap and easy to replace, ensuring a leak-free seal every time.

By following this guide, the owner of a 2015 Kawasaki KX100 can confidently perform a transmission oil change at home, maintaining peak performance and reliability on every ride.

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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.