How to Change the Oil in a 2012 Kawasaki KX85: Step-by-Step Guide

Shop parts for a 2012 Kawasaki KX85 Dirt Bike.

Changing the oil in your 2012 Kawasaki KX85 is crucial for ensuring smooth clutch operation and long transmission life. This guide is tailored specifically for the 2012 KX85 and proprietary to MotoSport.com.

Tools and Supplies Needed

  • 14mm socket and ratchet – for removing the drain plug
  • Oil drain pan – to catch old oil
  • Funnel – for pouring new oil
  • Measuring cup (metric, up to 1 liter) – to measure 700ml
  • Fresh transmission oil – 10W-40 or OEM recommended, 700ml
  • Shop towels or rags – for cleanup
  • Gloves (optional, but recommended)

Model-Specific Call-outs

  • Oil Volume: The 2012 KX85 (like all KX85 and KX100 models) takes exactly 700 milliliters of oil. Verify this with your owner’s manual, but this spec is consistent year-to-year for this model.
  • Oil Type: Use 10W-40 motorcycle transmission oil or OEM-recommended gear oil. Regular engine oil is not recommended for the transmission in two-stroke motorcycles.
    Note: The KX85 uses premix fuel for the engine; the crankcase oil is only for the gearbox.
  • Drain Plug Thread: Take care not to overtighten the drain bolt. The threads can strip easily—just hand-snug it and then give a gentle turn with the ratchet.

Step 1: Warm Up the Bike

  • Start your KX85 and let it idle for about 1 minute. This warms up the oil, helping it drain out faster and more completely.
    Tip: Do not rev the engine or let it overheat – just get it warm to the touch.

Step 2: Prepare the Workspace

  • Set the bike on a stand, keeping it as upright and level as possible.
  • Put the oil pan under the drain bolt, located underneath the right side of the main engine case.

Step 3: Drain the Old Oil

  • Use the 14mm socket and ratchet to loosen the drain plug.
  • Remove the drain plug completely and let the oil flow into the pan. Allow several minutes for all the oil to drain.
    Safety: The oil might be hot; avoid skin contact.
  • Inspect the drain plug for debris or metal shavings – if found, monitor on future changes as excessive shavings can indicate internal wear.

Step 4: Reinstall the Drain Plug

  • Clean the drain bolt and the sealing surface on the crankcase with a rag or towel.
  • Hand-thread the drain plug back into the case, then lightly snug it down with the ratchet.
    Important: Do NOT over-tighten – the KX85 is notorious for easily stripped drain threads. Just a gentle snug is enough to compress the sealing washer.
    YouTube Tip: "Be careful not to snug this green bolt down too tight or you'll strip the threads."

Step 5: Add Fresh Oil

  • Measure out 700 milliliters of fresh 10W-40 oil using a metric measuring cup.
  • Remove the oil fill cap (right side engine case above the clutch).
  • Using the funnel, slowly pour in all 700ml of oil.
  • Reinstall the oil fill cap securely by hand.

Step 6: Check the Oil Level

  • Take the bike off the stand and hold it upright and perpendicular to the ground.
  • Check the oil level by removing the oil check bolt or verifying the level at the observation notch on the case (consult your manual for the exact location and method). The oil should reach the designated notch.

Step 7: Inspect and Final Cleanup

  • Start the engine for 30 seconds, then shut off and wait a minute.
  • Check underneath for leaks at the drain plug.
  • Dispose of the old oil properly at a recycling center or automotive store.

Owner Tips & Maintenance Schedule for 2012 KX85

  • Change the oil every 3-5 hours of riding, especially after muddy or wet conditions, or after break-in.
  • Always use a good quality transmission oil, not 4-stroke engine oil. Two-stroke transmission/clutch gearboxes have unique needs.
  • Watch for any “milky” or grayish old oil, which can indicate water intrusion through worn seals or gaskets.
  • Keep an eye on the drain plug threads; damaged threads are a common issue on KX85 models due to overtightening.

Conclusion

Changing the oil in your 2012 Kawasaki KX85 is straightforward if you prepare the right tools and follow the recommended specs. Adhering to the correct volume, oil type, and proper torque on the drain plug will keep your transmission running smoothly and reduce costly repairs down the line.

For all your KX85 parts, tools, and lubricants, MotoSport.com has you covered – ride more, wrench less.

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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.