How to Change the Oil in a 2022 Yamaha YZ250X

Shop parts for a 2022 Yamaha YZ250X Dirt Bike.

Changing the oil in your 2022 Yamaha YZ250X is a fundamental maintenance task that keeps your clutch and gearbox running strong. Because the YZ250X is a two-stroke with premix engine lubrication, you'll be changing the transmission oil only. This step-by-step guide is tailored specifically for the YZ250X and proprietary to MotoSport.com.

Tools and Supplies Needed

  • Socket wrench (typically 10mm or 12mm depending on your drain bolt size)
  • Ratchet or T-handle
  • Oil catch pan/basin
  • Measuring cup (for accurate refill, e.g., Ratio Rite)
  • Funnel
  • Shop rags
  • Replacement copper washer (recommended, reusable sometimes)
  • Transmission oil (Yamaha recommends factory-approved oil like YAMALUBE Trans Oil or Maxima MTL 80W)
  • Torque wrench (optional, for precise bolt torque)

Yamaha YZ250X-Specific Notes

  • No oil filter or oil screens to replace/clean on 2-stroke YZ250X models, simplifying the process.
  • Oil quantity: The 2022 YZ250X takes approximately 0.8 liters (0.85 US quarts) of transmission oil.
  • Drain bolt location: On the bottom of the right-side case cover—wear safety gloves for hot oil.
  • Use only transmission-specific oil, as the engine is lubricated by premix fuel. Never use engine oil here.

Step-by-Step Instructions

  1. Warm Up the Bike
    • Start and let the bike idle for a couple minutes. This warms the oil for better flow and more complete draining.
    • Turn off the engine and let the bike cool for 1-2 minutes to avoid burns.
  2. Prepare the Work Area
    • Set the bike on a level stand to ensure accurate draining and filling.
    • Place the oil catch pan directly underneath the transmission drain bolt.
  3. Remove the Drain Bolt
    • Locate the drain bolt on the right side, at the bottom of the engine case.
    • Slowly loosen and remove the drain bolt with a socket wrench. Be prepared for oil to drain quickly.
    • If present, remove the old copper crush washer.
  4. Let the Oil Drain Completely
    • Allow all used transmission oil to drain. Tilting the bike slightly back and forth helps ensure complete drainage.
    • Inspect the oil for metal shavings or debris, which could indicate internal wear.
  5. Replace the Drain Bolt
    • Install a new copper washer for a better seal, if available (recommended, though not mandatory for every change).
    • Hand-tighten the drain bolt, then snug it securely. Do not overtighten–reference your manual for the correct torque value if using a torque wrench.
  6. Add New Transmission Oil
    • Remove the oil fill cap (usually located on the right engine cover above the drain bolt).
    • Using a clean funnel and measuring cup, pour in 0.8 liters (0.85 US quarts) of high-quality transmission oil (YAMALUBE Trans Oil or equivalent).
    • Secure the fill cap after adding oil.
  7. Check Oil Level and for Leaks
    • Start the bike and let it idle for 30 seconds, then turn it off and allow oil to settle for 1-2 minutes.
    • Check around the drain bolt for leaks.
    • Some YZ250X models use a check bolt on the side case; remove this briefly to see if oil seeps out (if yes, level is correct). If unsure, visually inspect through the oil level sight glass if equipped.
  8. Clean Up and Final Inspection
    • Wipe any spills and double-check the work area.
    • Dispose of old oil properly at a recycling center or auto parts store.

Additional Tips & Owner Reminders

  • Always follow Yamaha's recommended oil change intervals for race conditions: change transmission oil every 4–7 hours of use for optimal clutch/gearbox life.
  • Always use premix fuel for the main engine lubrication–transmission oil is only for gears and clutch.
  • If you ride in harsh or muddy conditions, increase oil change frequency.

Quick Recap for the 2022 Yamaha YZ250X:

  • No oil filter—just drain and fill transmission oil.
  • Capacity: 0.8 liters (0.85 US quarts)
  • Transmission oil only—never engine oil
  • Inspect drain plug washer each time

Keeping your YZ250X's transmission oil fresh is one of the best ways to ensure smooth performance and reliability on the trails. For genuine Yamaha lubricants and all the parts needed for your next service, trust MotoSport.com—your destination for OEM and performance dirt bike parts.

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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.