How to Change the Oil in a 2019 Yamaha YZ250F: The MotoSport.com Complete Guide

Shop parts for a 2019 Yamaha YZ250F Dirt Bike.

Changing your oil is a critical part of routine maintenance for your 2019 Yamaha YZ250F. Doing it yourself saves money, and ensures your race bike always gets the best care possible. This guide, proprietary to MotoSport.com, walks you through each step, highlights the tools you need, and calls out vital 2019 YZ250F specifics every owner should know.

Tools and Supplies Required

  • 10mm socket (for oil strainer)
  • 8mm socket (for oil filter cover)
  • Ratchet wrench
  • Oil drain pan
  • Funnel
  • Fresh engine oil (Yamalube 10W-40 Four-Stroke for OEM spec)
  • New oil filter (K&N KN-140 or OEM equivalent)
  • Replacement drain plug washer (crush washer)
  • New oil filter O-ring (recommended)
  • Shop rags
  • Torque wrench (highly recommended for drain bolt and filter cover bolts)

Steps to Change the Oil

  1. Warm Up the Engine
    Start the bike and let it idle for a few minutes. This thins the oil, helping it drain completely and bring out contaminants.
    Insider tip: Take a quick, short ride around the block to get the oil nice and warm, but never change oil after a full-heat ride as very hot oil can burn you.
  2. Remove the Skid Plate (if equipped)
    Use the appropriate tool to remove the skid plate for easier access to the drain bolt and strainer.
  3. Remove Oil Filler Cap
    Loosen the filler cap on the top right of the engine. This helps the oil flow out freely when you drain it.
  4. Drain the Old Oil
    • Place the oil pan beneath the engine–s drain bolt—on the lower right side, next to the frame rail.
    • Using a ratchet with a 10mm or 12mm socket (model-dependent), carefully loosen and remove the oil drain bolt.
    • Watch the flow and make sure it pours out smoothly into your pan.
    • Remove the strainer bolt (10mm socket on the left side of the engine) and clean the mesh strainer with brake cleaner or fresh oil before replacing.
    • Check the drain bolt for metal shavings–if you see significant debris, further investigation might be needed.
  5. Remove and Replace the Oil Filter
    • With an 8mm socket, remove the three bolts from the oil filter cover (right side of engine).
    • Carefully remove the cover and old oil filter—let any remaining oil drain into the pan.
    • Pay attention to how the filter sits; the new one must be installed the same way (the 2019 YZ250F uses a common cartridge style).
    • Replace the O-ring on the cover if worn or cracked. A fresh O-ring helps prevent leaks.
    • Install the new oil filter and torque the cover bolts evenly to manufacturer specs (check your service manual for specifics).
  6. Install New Drain Bolt Washer & Reinstall Drain Bolt
    • Replace the old washer/crush washer on the drain bolt with a new one to ensure a tight seal.
    • Tighten the drain bolt and the oil strainer bolt to Yamaha—s recommended torque setting (do not overtighten.).
  7. Pour in New Oil
    • Use a funnel to pour in fresh Yamalube 10W-40 4-stroke oil.
    • For the 2019 Yamaha YZ250F, the capacity is approximately 1.0 quart (0.95 liters) with filter change. Add about 0.8 quart, run the engine briefly, shut it down, and top off as needed.
    • Check the sight glass (right side of engine) or dipstick (if equipped) for the proper oil level.
  8. Reinstall Oil Filler Cap
    Tighten securely.
  9. Check for Leaks and Verify Oil Level
    • Start the engine, let it run for 30 seconds, then turn it off and let it sit for a minute to let oil settle.
    • Check for leaks at the drain plug, strainer, and filter cover.
    • Verify the oil level in the sight glass; add oil as needed to reach the recommended mark.
  10. Dispose of Old Oil Properly
    Pour used oil into a sealed container and take it to your local recycling center or automotive store for proper disposal.

2019 YZ250F-Specific Tips

  • Oil Capacity Caution: The 2019 YZ250F takes about 1 quart. Overfilling can cause excessive crankcase pressure and leaks, and underfilling can harm your engine. Always check the level after running the engine and top off slowly.
  • Sight Glass: The correct oil level is near the upper mark on the sight glass. Bike should be level (use a stand) when checking.
  • O-ring and Washer Replacement: Always inspect these components and replace as necessary to avoid leaks.
  • Strainer Cleaning: The oil strainer on this model is a metal mesh screen, critical for engine longevity. Always clean and inspect before reinstallation.
  • Torque Specs: Refer to your Yamaha owner–s manual for precise torque values. Commonly, the drain bolt is torqued to approximately 13–15 lb-ft; oil filter cover bolts to about 7 lb-ft.

Final Checklist Before Riding

  • Oil filler cap secure
  • No drips or leaks from drain bolt, filter cover, or strainer
  • Correct oil level after short warm-up and rest
  • Dispose oil and filter responsibly

Pro Tip from MotoSport.com: Changing your oil every 5–10 race hours or after every few trail rides ensures your YZ250F remains performing at its peak. Always keep a record of your oil changes for maintenance peace of mind.

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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.