How to Change the Oil in a 2016 Yamaha YZ85: Step–by–Step Guide

Shop parts for a 2016 Yamaha YZ85 Dirt Bike.

Welcome to MotoSport.com’s in-depth guide for changing the oil in your 2016 Yamaha YZ85. Performing regular oil changes is crucial to keeping your YZ85’s two-stroke engine running at peak performance, ensuring smooth gear changes and prolonging transmission life. In this guide, you'll find everything you need to know about this vital maintenance task, including specific call-outs for the 2016 model.

Tools and Supplies Needed

  • 10mm socket or wrench (for the drain bolt)
  • Oil drain pan
  • Funnel
  • 500 ml of recommended 2-stroke gear/transmission oil (check your owner’s manual for specific type; common choices include Yamalube or Motul Transoil)
  • Clean rags
  • Gloves (optional, but recommended)
  • Torque wrench (to properly torque the drain bolt, recommended at 10 Nm for YZ85 models)

2016 Yamaha YZ85 Model–Specific Call–Outs

  • Oil Capacity: 500 ml (0.53 US quart). Do not overfill.
  • Drain bolt torque: 10 Nm (7.2 ft-lb). Overtightening can strip threads in the case. Use a torque wrench if available.
  • Oil type: Use a high-quality, 2-stroke transmission oil designed for wet clutches. Yamaha recommends their own Yamalube, but other major brands like Motul or Maxima are suitable. Avoid regular engine oil, as it is not formulated for two-stroke gear cases.
  • No oil filter: The YZ85 does not have a conventional oil filter. Only the drain, refill, and bolt cleaning steps are required.

Step–by–Step Oil Change Procedure

  1. Prepare the Bike and Work Area
    • Begin with a clean bike. Dirt around the drain bolt can easily fall into the open transmission case.
    • Warm the engine up for 2–5 minutes. Warm oil drains faster and carries away more contaminants.
    • Stand the bike upright on a center stand or triangle stand.
    • Put on gloves to keep your hands clean and protect your skin.
  2. Drain the Old Oil
    • Locate the 10mm drain bolt under the right side of the engine, near the rear brake lever.
    • Place the oil drain pan beneath the bolt.
    • Using your 10mm socket or wrench, carefully loosen and remove the drain bolt. Let the oil fully drain.
    • To ensure complete draining, remove the oil fill cap (found on top of the right-side engine case). This allows air in and helps old oil flow out quickly.
    • If needed, gently tip the bike to the side to get out the last bit of oil.
  3. Inspect and Clean the Drain Bolt
    • Check the drain bolt for any metal shavings or debris. A few small flecks are normal, but excessive metal can indicate a problem.
    • Wipe the bolt and its sealing washer clean with a rag.
    • Inspect the washer for cracks or wear. Replace if damaged.
  4. Reinstall the Drain Bolt
    • Thread the drain bolt in by hand, then snug it down with your wrench.
    • Use a torque wrench to tighten the bolt to 10 Nm (7.2 ft-lb) to avoid stripping.
  5. Refill with Fresh Oil
    • Place a funnel in the oil fill hole.
    • Pour in 500 ml of recommended 2-stroke transmission oil.
    • Reinstall and tighten the oil fill cap by hand.
  6. Clean Up and Check Your Work
    • Wipe away any oil drips with a clean rag.
    • Start the bike and let it idle for 1–2 minutes to allow the oil to coat all moving parts.
    • Check for leaks around the drain bolt and oil fill cap.
    • Dispose of old oil responsibly at an approved recycling center.

Tips and Safety Reminders

  • Change the oil after every 5–10 hours of ride time or after muddy, wet, or race conditions.
  • Using the right oil is essential for transmission and clutch performance.
  • Stay clean and avoid burns by letting the engine cool slightly after warming it up.
  • Record the oil change in your maintenance log for future reference.

With these steps, your 2016 Yamaha YZ85 will be ready for more hard riding. Regular maintenance keeps your machine performing at its best—brought to you by MotoSport.com.

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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.