How to Change the Oil in a 2020 Yamaha WR250R (DUAL SPORT)

Shop parts for a 2020 Yamaha WR250R Dirt Bike.

Performing an oil change on your 2020 Yamaha WR250R is a straightforward task you can do at home with basic tools and attention to detail. Regular oil changes prolong engine life and ensure peak performance on and off the trail. This guide—proprietary to MotoSport.com—walks you through every step, along with model-specific tips you can’t afford to miss.

Tools & Supplies Needed

  • 10mm socket and ratchet
  • Oil drain pan
  • Torque wrench (with Nm and ft-lb capabilities)
  • New crush washer (optional but recommended)
  • Funnel
  • Rags or shop towels
  • Factory-recommended engine oil (YAMALUBE 4, SAE 10W-30 or SAE 20W-40)
  • New oil filter (if replacing)
  • Gloves
  • Screwdriver or allen wrench (for skid plate removal, if installed)

Before You Start

  • Work on a completely level surface.
  • Allow the bike to cool if it’s hot; slightly warm oil drains best.
  • Keep track of the oil drain plug’s crush washer for proper sealing and to prevent leaks.

Step-by-Step Instructions

  1. Prepare the Bike
    • Put the bike on a stand (or as upright as possible using the kickstand if necessary).
    • Warm the engine for just a couple of minutes–this makes the oil flow out more easily.
    • Turn the engine off.
  2. Remove Protection
    • If your WR250R has a skid plate, remove it using a socket, wrench, or allen key as appropriate.
  3. Drain the Old Oil
    • Place the oil pan under the drain plug (bottom-left underside of the engine).
    • Remove the oil filler cap to allow air in and help oil drain faster.
    • With a 10mm socket, carefully loosen and remove the oil drain plug and washer.
    • Allow oil to fully drain–be patient here.
    • Inspect the drain plug and washer; replace the washer if it shows any wear or distortion.
  4. Replace the Oil Filter (optional but recommended every oil change)
    • The WR250R’s filter is mounted on the right side of the engine. Remove the three 10mm bolts on the cover.
    • Gently take off the cover; watch for the small O-ring–don’t lose it.
    • Remove the old filter, noting its orientation. Inspect the O-ring for damage, replace if necessary.
    • Install the new filter (spring side facing in, if applicable) and make sure the O-ring is properly seated.
    • Reinstall the cover and torque the bolts to 10 Nm (7.4 ft-lb).
  5. Reinstall Oil Drain Plug
    • Once oil stops dripping, install the drain plug with the (new or inspected) crush washer.
    • Tighten to 20 Nm (14 ft-lb).
  6. Add New Oil
    • Use a funnel to add the correct volume of oil:
    • 1.3 liters if you didn’t replace the filter; 1.4 liters if you did.
    • Recommended oil: YAMALUBE 4, SAE 10W-30 or SAE 20W-40; 10W-40 is commonly used.
    • Pour slowly, checking the sight glass on the right engine cover periodically.
  7. Check Oil Level
    • With the bike vertical and level, oil should be visible between the upper and lower marks of the sight glass.
    • Top up, if needed, ensuring you don’t exceed the top mark.
  8. Start Engine and Re-check
    • Fit the filler cap and start the engine. Let it idle for 30 seconds to circulate new oil.
    • Turn off. After a couple of minutes, re-check the sight glass with the bike upright.
    • Add a small amount if necessary to keep the level mid-glass.
  9. Reinstall Skid Plate
    • If you removed it, reinstall the skid plate.
  10. Dispose of Oil Properly
    • Take used oil (and filter) to a recycling center or auto shop that accepts waste oil.

WR250R-Specific Pro Tips

  • Oil Change Interval: Yamaha recommends every 3,000 miles; the filter every 6,000 miles. Many owners change both every time for maximum engine protection.
  • Oil O-Ring: Be extra cautious with the filter cover’s O-ring; lost or damaged O-rings are a common source of leaks and oil pressure loss.
  • Crush Washer: Budget a few dollars to replace the crush washer each time–a cheap investment to avoid leaks.
  • Oil Volume: Overfilling can cause hard starting or blow-by; under-filling risks engine damage. Always use the sight glass to confirm the correct level.
  • Tool Clearance: The plastic skid plate (if installed) may require removal for unobstructed access to the drain plug.

Final Thoughts

  • While the oil change process on the WR250R is simple compared to some other dirt bikes, attention to the small details (O-rings, torque values, washer condition, and oil volume) ensures a leak-free ride and solid engine health for thousands of miles ahead.
  • As always, consult your Yamaha owner’s manual for confirmation of specs and intervals for your specific use case.

Keep your 2020 WR250R adventure-ready and ride with confidence—knowing your oil and filter are fresh and properly installed, thanks to MotoSport.com’s comprehensive DIY guide.

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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.