How to Change the Oil in a 2019 Yamaha YZ250FX

Shop parts for a 2019 Yamaha YZ250FX Dirt Bike.

Maintaining your Yamaha YZ250FX dirt bike is key to keeping it running at peak performance. Changing the oil is one of the simplest and most vital maintenance tasks you can perform. Below, you'll find a comprehensive, step-by-step guide tailored specifically to the 2019 YZ250FX, complete with the tools required, special call-outs, and tips to make the process smooth and worry-free. This oil change process applies to all YZ250FX models from 2020 to 2023 as well, with little to no variation for the 2019 model year.

Tools and Supplies Needed

  • 8mm socket or T-handle (for oil filter cover)
  • 12mm socket or wrench (for drain bolt)
  • Oil drain pan
  • Oil funnel
  • New oil filter (Yamaha OEM or equivalent)
  • Replacement O-rings (for oil filter cover, highly recommended)
  • Fresh engine oil (Yamalube 10W-40 or high-quality 4-stroke dirt bike oil, per manual's spec)
  • Rags or shop towels
  • Torque wrench (for reinstalling bolts to manufacturer specs)
  • Latex/nitrile gloves (optional, but recommended)

Step-by-Step Instructions

  1. Warm Up the Engine
    • Start the bike and let it idle for 2–3 minutes. This circulates the oil, suspends contaminants, and thins the oil for better draining.
    • Turn off the engine and let it sit for a minute.
  2. Remove the Oil Fill Cap
    • Located on the top right-hand (clutch) side of the engine. This helps oil drain faster and easier.
  3. Drain the Oil
    • Place an oil drain pan beneath the 12mm drain bolt on the rear, clutch side of the engine.
    • Remove the drain bolt and allow the oil to completely drain out. Pro Tip: Draining into a clear container lets you spot possible issues like coolant contamination (milky color) or metallic flakes.
  4. Remove and Replace the Oil Filter
    • On the clutch side of the engine, locate the oil filter cover (held by two 8mm bolts).
    • Loosen and remove both bolts, then carefully remove the cover. Have a funnel or another small pan ready to catch residual oil.
    • Pull out the old filter. Inspect the cover and replace the O-rings if they are flattened, damaged, or brittle.
    • Lubricate the new O-rings with a little fresh oil, then install the new oil filter, aligning any tabs or marks as indicated.
    • Reinstall the cover and bolts. Torque to manufacturer specifications if possible—do not over tighten as the bolts thread into soft aluminum.
  5. Check and Clean the Oil Strainer
    • Inspect and clean the oil screen/strainer located inside near the drain bolt. You'll need the correct socket (sometimes 10mm) to remove and access the strainer.
    • Clean any debris or metallic particles, then reinstall the screen and bolt with a new sealing washer or gasket if needed.
  6. Reinstall the Drain Bolt
    • Ensure the crush washer or gasket is replaced if worn or deformed. Tighten the bolt to manufacturer spec (do not overtighten.).
  7. Add New Oil
    • With the drain bolt and oil filter in place, use a funnel to fill the engine with the specified amount (consult your manual—it's about 1.0 to 1.05L for the YZ250FX). Tip: It's always safer to start a little below full, as you can easily top off after checking the level.
    • Replace and tighten the oil fill cap.
  8. Check the Oil Level
    • Start the bike and let it idle for 30–60 seconds, then shut it off and let it settle for a minute.
    • Check the oil level using the sight glass. Add oil as needed, being careful not to overfill. Overfilling can lead to excessive crankcase pressure and leaks.
  9. Final Checks
    • Check for leaks around the drain bolt, filter cover, and fill cap.
    • Wipe down any spilled oil from the engine and frame.
    • Properly dispose of the old oil and filter at your local auto parts store or recycling center.
  10. Log Your Maintenance
    • Note the date and engine hours/mileage of your oil change so you can keep your maintenance intervals consistent. Many owners change oil every 5–7 hours of running, especially if racing or riding in harsh conditions.

2019 Yamaha YZ250FX Model-Specific Call-Outs

  • Drain Bolt Location: 12mm on the rear, clutch side of the engine.
  • Oil Filter Access: Oil filter is on the clutch side, held by two 8mm bolts. Watch for residual oil that will drain out when you remove the cover.
  • Reuse or Replace O-rings: It's recommended to replace the small O-ring on the filter cover each time to prevent leaks (always lube with fresh oil before reassembly).
  • Oil Capacity & Specs: Check your owner's manual for the correct fill volume—usually between 1.0–1.05 liters for a full change with filter. Use Yamalube 10W-40 or equivalent high-quality motorcycle oil.
  • Maintenance Intervals: Many owners and racers change oil every 5–7 engine hours or after every hard riding session.
  • No Special Tools Required: Standard metric sockets and hand tools are sufficient; a torque wrench is highly recommended.

Pro Tips from MotoSport.com

  • Keep old oil samples in a clear bottle for diagnosis if issues arise.
  • Always work with a warm engine for fuller drainage.
  • Be careful when removing filter cover bolts — they are short and thread into soft alloy, so avoid over-tightening.
  • Track your oil changes using apps or a logbook so your YZ250FX always gets fresh oil when needed.

Regular oil changes are one of the best things you can do for your Yamaha YZ250FX's longevity and performance. If you ride hard, stay ahead of maintenance with premium oils and genuine Yamaha filters—available direct from MotoSport.com. Happy riding.

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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.