How to Change the Oil in a 2020 Yamaha YZ250FX

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Changing the oil in your 2020 Yamaha YZ250FX is an essential part of regular maintenance to ensure long engine life and top performance. This step-by-step guide, proprietary to MotoSport.com, covers all the details, from tools needed to specific callouts for this model year. Whether you are a seasoned mechanic or a weekend warrior, here’s everything you need to confidently complete the job.

Tools and Materials Needed

  • 8mm socket or T-handle (for oil filter cover)
  • 10mm socket or T-handle (for oil strainer cover)
  • 12mm socket or wrench (for drain plug)
  • Oil drain pan
  • Plastic or metal funnel
  • New oil filter
  • Fresh 10W-40 Yamalube (or equivalent four-stroke motorcycle oil)
  • Replacement O-rings and crush washer (recommended)
  • Rags or shop towels (for cleanup)
  • Needle-nose pliers (optional, for strainer removal)
  • Measuring cup (to ensure correct oil volume)

Step-by-Step Process

  1. Warm the Engine
    • Start the YZ250FX and let it run for a few minutes. This helps the oil drain easily and thoroughly by thinning it out.
  2. Turn Off the Engine and Secure the Bike
    • Turn the engine off and secure the bike upright using a center or side stand.
  3. Drain the Oil
    • Place your drain pan under the engine. Using a 12mm socket, carefully remove the oil drain bolt located at the bottom of the engine. Watch out for hot oil. Allow the oil to drain completely.
  4. Remove and Clean the Oil Strainer
    • On the 2020 YZ250FX, there’s an oil strainer that requires cleaning. Locate the strainer cap by the engine case, loosen it with a 10mm socket or T-handle, and remove the strainer. Clean it with brake cleaner or contact cleaner, then dry and reinstall. This step is unique to Yamaha’s design and helps protect the oil pump and engine internals. For easier access, needle-nose pliers can help pull out the strainer.
  5. Remove and Replace the Oil Filter
    • Using the 8mm socket or T-handle, remove the bolts on the oil filter cover (located on the engine’s right side). Make note of the orientation of the old filter and install a new filter, ensuring that the spring and O-rings are in their correct positions. Replace the O-ring on the cover for a proper seal if you have a new one.
  6. Install a New Crush Washer and Reattach the Drain Plug
    • Always use a new crush washer on the drain bolt to prevent leaks. Reinstall and torque the bolt to Yamaha’s specification (usually around 18 ft-lbs, but consult your owner’s manual for exact specs).
  7. Refill with Fresh Oil
    • Pour the recommended amount (approximately 1.0 L with filter change) of 10W-40 Yamalube through the oil fill hole using a funnel. Be careful not to overfill. Use a measuring cup for accuracy.
  8. Reinstall the Oil Fill Cap
    • Once filled, reinstall the oil fill cap securely.
  9. Start the Bike and Check for Leaks
    • Start the engine and let it idle for 1–2 minutes. Check around the drain plug, filter cover, and strainer cap for any oil leaks. Shut off the bike and let it sit for a minute, then check the oil level using the dipstick or sight glass. Add oil if needed.
  10. Proper Oil Disposal
    • Pour old oil into a sealed container and dispose of it at your local recycling center. Never dump used motor oil into the ground or trash.

2020 Yamaha YZ250FX Specific Call-Outs

  • Oil Strainer Cleaning: Yamaha’s 2020 YZ250FX includes an oil strainer, not found on all bikes. Cleaning this is critical for long-term engine health. Always inspect and clean the strainer with each oil change.
  • Gasket and O-ring Condition: Both the oil drain bolt and filter cover use gaskets or O-rings that should be replaced each service to prevent leaks. Have spare O-rings and crush washers on hand for every oil change.
  • Specified Oil Type and Volume: Always use a high-quality 10W-40 synthetic motorcycle oil such as Yamalube, and measure the oil added—1.0L (with filter) for the 2020 Yamaha YZ250FX.
  • Filter Orientation: Double-check the orientation and seating of the oil filter and cover spring. If installed backward, engine damage can occur.
  • Torque Specs: Confirm all fasteners are properly torqued according to the service manual to avoid stripping threads or leaks.

Final Checklist Before Riding

  • All bolts are properly tightened and torqued
  • No oil leaks around the drain, filter, or strainer areas
  • Oil level is correct after the bike has idled and settled
  • Tools and rags are removed from the work area

Tip from MotoSport.com

Regular oil changes are the most important maintenance you can do for your YZ250FX’s engine life and performance. Stick to Yamaha’s recommended change intervals and always double-check everything before heading out on your next ride.

Enjoy the ride, and keep your 2020 Yamaha YZ250FX running strong.

Proprietary to MotoSport.com. For more parts, oil, and expert tips, trust MotoSport.com for your Yamaha needs.

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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.