How to Change the Oil in a 2013 Kawasaki KX85

Shop parts for a 2013 Kawasaki KX85 Dirt Bike.

Changing the oil in your 2013 Kawasaki KX85 is one of the simplest yet most critical maintenance tasks you can do to ensure smooth operation and help extend the life of your dirt bike. The KX85, like other two-stroke dirt bikes, uses transmission or gear oil for the clutch and gearbox instead of engine oil like a four-stroke. The process is straightforward if you follow the right steps and use the correct tools. This guide is crafted specifically for MotoSport.com and covers everything you need to know to change the oil in your 2013 KX85, including the tools required, step-by-step instructions, and special model-specific tips.

Tools and Supplies Needed

  • 14mm socket and ratchet (for drain bolt)
  • Torque wrench (capable of precise, low-range torque measurements)
  • Drain pan
  • Funnel
  • Measuring cup (with milliliter markings up to 700ml)
  • Clean rags or shop towels
  • Proper oil for KX85 (10W-40 or manufacturer-recommended gear oil)
  • Replacement crush washer (optional, but recommended to prevent leaks)

Model-Specific Note for 2013 Kawasaki KX85

  • The 2013 KX85 takes 700 milliliters of transmission/gear oil. Using too much or too little oil can cause shifting problems or damage.
  • The drain bolt threads can strip easily if over-tightened. Kawasaki recommends a torque spec of 11 foot-pounds for the oil drain bolt. Use a torque wrench for best results and avoid overtightening.
  • Check oil level with the bike upright and perpendicular to the ground. There’s a level check notch or sight glass—ensure oil comes up to this mark only.

Step-by-Step Instructions

  1. Warm Up Your Engine (Optional, but recommended)
    Run your KX85 for a few minutes to warm the oil. This helps suspend contaminants and allows the oil to drain more thoroughly. Shut off the bike and let it cool until it’s comfortable to touch.
  2. Stabilize the Bike
    Place the bike on a stand to keep it upright and stable. This is important for draining and refilling the oil to the correct level.
  3. Locate and Remove the Oil Drain Bolt
    The drain bolt is found on the bottom of the engine case. Place the oil pan under the bolt. Use your 14mm socket and ratchet to remove the drain bolt. Be careful; the oil may still be hot.
  4. Drain the Oil
    Allow all the oil to completely drain out. Tilt the bike gently if needed, but keep it mostly upright. Let it drain for at least five minutes to get as much old oil out as possible.
  5. Inspect and Clean Drain Plug
    Wipe off the drain plug with a rag, and check for excessive metal shavings. Replace the crush washer if necessary to avoid leaks.
  6. Reinstall the Drain Bolt
    Thread the drain bolt back by hand first. Use your torque wrench to tighten the bolt to 11 ft-lbs (15 Nm). Do not overtighten, as the threads in the case are easy to strip.
  7. Measure and Add New Oil
    Pour 700 ml of 10W-40 or manufacturer-recommended gear/transmission oil into a measuring cup. Remove the filler cap (usually located on the right side of the engine above the clutch cover) and use a funnel to pour the oil in.
  8. Replace the Oil Fill Cap
  9. Check Oil Level
    Remove the bike from the stand and hold it upright, perpendicular to the ground. Look at the level inspection mark or sight glass (on the back right side of the engine case). The oil should just reach the bottom of the inspection hole or fill to the designated notch.
  10. Wipe and Clean Up
    Wipe away any spilled oil and dispose of old oil responsibly.

Additional Tips for the 2013 KX85

  • Change the oil every 3–5 hours of riding, or after each race for maximum engine protection.
  • If you ride in muddy or wet conditions, change the oil more frequently.
  • Only use oil specifically designed for two-stroke transmission/gear systems–it is crucial for clutch performance and gearbox longevity.
  • Inspect your oil after each change. Milky oil can indicate water contamination, while excessive metal shavings may signal gear or clutch wear.
  • Never overtighten the drain bolt. Stripped threads in the soft aluminum engine case can be costly and time-consuming to repair.

Conclusion

Changing the oil on your 2013 Kawasaki KX85 is a quick and essential part of regular maintenance. With the tools and steps above, you’ll keep your bike riding smooth and extend its lifespan. Always follow the manufacturer’s recommendations, measure carefully, and take note of torque specs to avoid costly mistakes.

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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.