How to Change the Oil in a 2019 Yamaha YZ250X

Shop parts for a 2019 Yamaha YZ250X Dirt Bike.

Changing the transmission oil in your 2019 Yamaha YZ250X is one of the most crucial maintenance tasks and ensures the longevity of your two-stroke's engine and gearbox. This guide is proprietary to MotoSport.com and tailored specifically for owners of the 2019 YZ250X. While the process is similar to other YZ250 series bikes, there are some details unique to this model.

Tools and Materials Needed

  • Socket wrench set (with 8mm and 12mm sockets)
  • Open-ended or box wrench set
  • Large flathead screwdriver (optional)
  • Oil catch pan
  • Funnel
  • Measuring cup (Ratio Rite or equivalent)
  • Fresh transmission oil (Yamalube, Maxima MTL 80W, or manufacturer-recommended oil)
  • Replacement drain plug washer (copper preferred)
  • Clean rags
  • Nitrile gloves (optional but recommended)

Important Call-Outs For the 2019 YZ250X

  • No oil filter:– The YZ250X does not have an oil filter for the transmission oil, simplifying the process compared to most four-strokes.
  • Oil capacity:– For the 2019 YZ250X, the transmission case requires approximately 0.75-0.80 US Quarts of oil (check the owner's manual for specs).
  • Only gear oil:– This oil change concerns the transmission—fuel/oil premix for the engine is separate on this two-stroke model.

Step-by-Step Instructions

  1. Warm Up the Engine
    Run the engine for a few minutes. This warms and thins the oil, helping it drain completely.
  2. Turn Off and Secure the Bike
    Shut off the engine and place the bike on a level stand to prevent spills.
  3. Remove the Filler Cap
    This is usually a large cap on the right side (clutch side) of the crankcase. Removing it allows air in for better drainage.
  4. Place Oil Pan Beneath the Drain Bolt
    The drain bolt is directly under the engine (bottom of the crankcase). Make sure your pan is centered to catch all old oil.
  5. Remove the Drain Bolt
    Use your 12mm socket or open wrench to loosen and remove the drain bolt. Allow all oil to drain—be patient and tilt the bike slightly if needed.
    Pro tip: Check the drained oil for metal shavings. A small amount is normal, but excessive glitter means internal wear.
  6. Inspect and Replace the Washer
    Inspect the copper washer on the drain bolt. Replace it if it looks worn or crushed to prevent future leaks.
  7. Reinstall the Drain Bolt
    Once the oil has fully drained, thread the drain bolt back in by hand. Use your wrench to snug it—do not overtighten as the aluminum threads can strip.
  8. Refill with New Oil
    Use the measuring cup to pour 0.75-0.80 US Quarts of high-quality transmission oil through the filler hole.
    Yamalube and Maxima MTL 80W are popular choices for Yamaha two-strokes.
    Use a funnel to avoid spills.
  9. Reinstall the Filler Cap
    Tighten it by hand until snug.
  10. Check for Leaks
    Wipe the area clean, start the engine, and let it idle for a minute. Turn off the bike and inspect the drain bolt and filler cap area for leaks.
  11. Dispose of Old Oil Properly
    Take the used oil to a recycling center or auto shop for proper disposal—never dump it down drains or onto the ground.

Extra Tips and Reminders for YZ250X Owners

  • Oil Intervals:– Change your transmission oil every 5-10 hours of riding, or after every race or ride in muddy conditions.
  • Pre-Mix Reminder:– Remember, your engine's lubrication depends on your fuel/oil premix, not the gearbox oil. This procedure only maintains gearbox and clutch health.
  • Torque Specs:– For the drain bolt, consult your manual for proper torque (generally around 13-15 ft/lbs). Do not overtighten.

Maintaining your 2019 Yamaha YZ250X's transmission oil is a simple job that can be done in under 30 minutes and is crucial for smooth shifting, clutch longevity, and preventing expensive repairs. Make this a regular part of your maintenance schedule and enjoy reliable, worry-free riding from your YZ250X.

Genuine MotoSport.com proprietary content. For all OEM and aftermarket dirt bike oils and parts, trust MotoSport.com—your pro source for Yamaha maintenance supplies.

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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.