How to Change the Oil in a 2022 Yamaha YZ85 Big Wheel

Shop parts for a 2022 Yamaha YZ85 Big Wheel Dirt Bike.

Changing the oil in your 2022 Yamaha YZ85 Big Wheel is a crucial maintenance task that keeps your engine running at peak performance and extends the life of your dirt bike. Below you’ll find a comprehensive, step-by-step guide created specifically for MotoSport.com customers. This walkthrough covers the essential tools, the procedure, and unique model-specific information every YZ85 Big Wheel owner should know.

Tools & Supplies Needed

  • 10mm wrench or socket – for removing the drain bolt
  • Measuring cup – to measure replacement oil accurately
  • Funnel – for pouring new oil without spillage
  • Fresh transmission oil (500 mL/0.53 US qt) – use a high-quality 2-stroke gear oil
  • Shop towels/rags – for cleanup
  • Disposable gloves (optional but recommended)
  • Small drain pan – to catch old oil
  • Torque wrench (recommended, set to 10 Nm)

Preparation

  • Warm up the engine for a few minutes to thin the oil for better drainage, then switch it off and allow it to cool slightly for safe handling.
  • Place your YZ85 Big Wheel on a stand so it’s upright and stable.
  • Clean the area around the drain bolt and fill cap to prevent dirt from entering the engine during the process.

Step-by-Step Oil Change Guide

  1. Locate the Drain Bolt:
    • The oil drain bolt is on the bottom of the engine case, typically 10mm in size.
  2. Remove the Oil Fill Cap:
    • Take off the oil fill cap (located on the right side of the engine) to allow air in and ensure oil drains freely.
  3. Drain the Old Oil:
    • Slide the drain pan under the bolt. Use your 10mm wrench or socket to loosen and remove the bolt. Allow oil to fully drain out – this may take several minutes. Be patient and let it drip completely.
  4. Inspect and Clean the Drain Bolt:
    • Wipe off the bolt and inspect the sealing washer for damage. Replace the washer if necessary.
  5. Reinstall the Drain Bolt:
    • Once drained, reinstall the bolt by hand first to avoid cross-threading. Tighten with the 10mm wrench. For extra precision, use a torque wrench and set it to 10 Nm (7.4 ft-lb).
  6. Add New Oil:
    • Place the funnel in the oil fill port. Using a measuring cup, add exactly 500 mL (0.53 US qt) of fresh, high-quality transmission/gear oil.
    • Pour oil in slowly. Dumping it in all at once can cause it to overflow or splash.
  7. Replace the Fill Cap:
    • Secure the fill cap once all oil is inside. Wipe away any drips.
  8. Check for Leaks:
    • Start the engine and let it idle for a minute, then shut it off and inspect the drain bolt area for leaks. If you see oil, re-tighten as necessary.
  9. Proper Disposal:
    • Dispose of the old oil at your nearest recycling center or auto parts store in accordance with local regulations.

Model-Specific Call-Outs for 2022 Yamaha YZ85 Big Wheel

  • The 2022 YZ85 Big Wheel uses exactly 500 mL of oil for each change. Overfilling or underfilling can affect clutch engagement and shifting feel, so always measure precisely

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  • The drain bolt torque spec is 10 Nm (7.4 ft-lb). Always use a torque wrench if available to avoid overtightening, which can strip threads or crush the washer

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  • Recommended oil type is a quality 2-stroke transmission/gear oil. Popular choices among riders include Motul Trans Oil and other dedicated motorcycle gear oils. Do not use automotive engine or transmission fluids, as these do not meet Yamaha’s specs

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  • For best results, slightly warm up the bike before draining oil – this allows it to flow freely and helps remove contaminants

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  • Always make sure the fill and drain areas are clean before opening to prevent debris from entering the engine case, which could cause premature wear

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  • Big Wheel models have the same oil process as the standard YZ85; wheel size does not affect the oil change procedure.

Pro Tips

  • If you’re working in a dusty, sandy, or muddy environment, pay extra attention to cleaning around the fill and drain areas before beginning.
  • If you frequently ride in wet, muddy, or extreme conditions, check your oil more often as moisture can contaminate oil.
  • Record your maintenance in a log for easier future service tracking.

MotoSport.com proudly supports riders with authoritative guides. For more YZ85 parts, oil, or expert advice, visit us anytime or contact our customer support team for one-on-one help. Enjoy the ride knowing your Yamaha runs strong.

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Shop Tools for a 2022 Yamaha YZ85 Big Wheel Dirt Bike.

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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.