How to Change the Oil in a 2020 Yamaha YZ250F: A Complete MotoSport.com Guide

Shop parts for a 2020 Yamaha YZ250F Dirt Bike.

Proper oil changes are essential to keep your 2020 Yamaha YZ250F running strong, maximizing longevity and performance. This detailed guide will walk you through every step, outline the tools you'll need, and call out model-specific tips for changing the oil in your YZ250F dirt bike.

Tools and Supplies Needed

  • Engine Oil: Yamalube 10W-40 (or another JASO MA/SG-rated 4-stroke oil, see owner's manual for viscosity recommendations)
  • Oil Filter: Compatible with 2020 YZ250F (OEM or K&N KN-140 recommended)
  • Oil Drain Pan
  • Socket Wrench Set: 8mm, 10mm, 12mm sockets
  • Torque Wrench
  • Rags or Shop Towels
  • Funnel (preferably with measuring marks)
  • Oil Filler Cap Gasket (replacement suggested)
  • Rubber Gloves (optional)
  • Stand to keep the bike upright and level

Step-by-Step Oil Change Instructions

  1. Warm up the Engine
    • Start the engine and let it idle for several minutes. This thin outs the oil, ensuring it drains completely and carries away more impurities.
  2. Shut off the Engine and Secure the Bike
    • Turn the engine off, then use a suitable stand to keep the YZ250F upright and steady on a level surface. Allow the bike to sit for about 5 minutes so hot oil drains to the crankcase.
  3. Remove the Skid Plate (if equipped)
    • Use your wrench or socket to remove the lower engine/skid guard to access the drain bolts as needed.
  4. Drain the Engine Oil
    • Position your oil drain pan under the engine.
    • Remove the oil filler cap to allow air to help drain.
    • Remove the crankcase drain bolt (12mm). It's located under the engine, toward the rear on the clutch side.
    • There's also an oil strainer bolt (10mm) and an oil tank drain bolt (if equipped; check your model's schematic).
  5. Remove and Replace the Oil Filter
    • Locate and remove the oil filter cover using the 8mm socket. It's on the right side of the engine.
    • Carefully pull out the old oil filter. Check and replace the O-ring on the cover if it shows signs of wear.
    • Push the new oil filter in (note the direction: open side toward the engine).
    • Reinstall the oil filter cover. Tighten the bolts evenly to factory torque specs to avoid leaks and warping.
  6. Inspect and Clean the Oil Strainer
    • On the opposite side of the engine, remove and inspect the oil strainer (10mm socket). Clean it if it's clogged or dirty, then reinstall it with a new O-ring/gasket if necessary.
  7. Install Drain Bolts
    • Clean the drain bolts and install new crush washers if available.
    • Reinstall all drain bolts and torque them to manufacturer's specifications to avoid under- or overtightening.
  8. Add Fresh Oil
    • Using a funnel, fill the engine with the specified oil type and volume for the 2020 YZ250F. Usually, this is about 1.05 liters (refer to your owner's manual).
    • Reinstall the oil filler cap securely.
  9. Check Oil Level
    • Start the engine and let it idle for several minutes. Turn off and wait a few minutes for the oil to settle.
    • With the bike upright, check the oil level sight glass or dipstick and top up if necessary.
  10. Final Checks
    • Inspect all drain bolts, oil filter, and cap for leaks while the engine runs briefly, then after shutting it off.
    • Dispose of used oil and filter legally and environmentally responsibly.

2020 Yamaha YZ250F Model-Specific Call-outs

  • The 2020 YZ250F uses a dual drain bolt system—be sure to remove and reinstall both the crankcase and strainer bolts for a full oil change.
  • OEM specification for oil is 10W-40, JASO MA rated.
  • Check and clean the oil strainer each time for maximum engine protection.
  • Always check for worn O-rings and gaskets, especially on the oil filter cover and drain plugs, to avoid leaks.
  • Warm up the bike before draining for the most complete oil removal.
  • The refill oil capacity is approximately 1.05 liters (1.1 US qt) when also changing the oil filter.

Expert Tips from MotoSport.com

  • Use a funnel with an integrated measuring cup to avoid overfilling or spillage.
  • After refilling, run the engine and briefly check for leaks at all replaced components.
  • Always change oil after riding in extreme conditions (mud, water crossings, sand, etc.) for longer engine life.
  • Keep a maintenance record to track oil changes and filter replacements.

Changing the oil on your 2020 YZ250F is straightforward when you follow these steps—helping you ride longer and stronger, courtesy of MotoSport.com.

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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.