How to Change the Oil in a 2020 Yamaha WR250F

Shop parts for a 2020 Yamaha WR250F Dirt Bike.

If you own a 2020 Yamaha WR250F, performing regular oil changes is crucial for engine health and the longevity of your bike. Follow this detailed, model-specific guide brought to you by MotoSport.com to properly change the oil, inspect components, and keep your WR250F running at its best.

Tools and Supplies Needed

  • 10mm and 12mm socket/wrench (for the oil drain bolt and oil filter cover bolts)
  • Drain pan
  • Funnel
  • Plastic measuring cup (minimum 1 quart capacity)
  • Clean shop towels or rags
  • OEM oil filter (Yamaha part recommended)
  • Replacement crush washer (optional but recommended)
  • Fresh engine oil (10W-40 four-stroke oil such as Yamalube or equivalent, 0.8 quarts capacity)
  • Contact cleaner (for cleaning up excess oil)
  • Gloves and eye protection (for safety)

Preparation

  • Warm up the engine to operating temperature by idling it for a few minutes. This helps circulate the oil and allows it to drain more thoroughly.
    Tip: Always perform the oil change with the bike upright (on a stand) and on level ground.
  • Shut off the engine and let it cool for a minute to avoid burns. Put the bike in neutral.

Step-by-Step Oil Change Instructions

  1. Remove the Skid Plate (if equipped):
    • Some WR250F models have a skid plate protecting the frame. Remove it to access the engine drain bolt.
  2. Locate and Remove the Drain Bolt:
    • The engine oil drain bolt is a 12mm hex head under the right side of the engine case.
    • Place the drain pan under the bolt, remove it, and let the oil drain completely.
      Tip: Tilting the bike gently to the right side can help drain more oil.
  3. Inspect and Clean the Oil Strainer (Screen):
    • The 2020 WR250F has an oil strainer screen that catches debris before oil enters the engine. Remove the small hex bolt holding the screen cover and pull it out gently.
    • Check for debris or metal shavings. Clean the strainer with contact cleaner and a clean rag, then reinstall it securely.
  4. Replace the Crush Washer:
    • If possible, install a new crush washer on the drain bolt to prevent leaks.
    • Reinstall and torque the drain bolt to Yamaha spec (typically around 17 lb-ft; consult your manual).
  5. Remove and Replace the Oil Filter:
    • Locate the oil filter cover (right side, toward the front of the engine) and use a 10mm socket to remove the two bolts.
    • Pull off the cover and remove the old oil filter. Check that the old O-ring on the cover is intact and replace it if necessary (an O-ring kit is recommended for best results).
    • Install the new filter, ensuring it's oriented correctly (open end out). Reinstall the filter cover and torque the bolts evenly.
  6. Add Fresh Oil:
    • Remove the oil fill cap on the engine's right side.
    • Using a funnel, pour in 0.8 quarts (approx. 0.76 liters) of 10W-40 four-stroke oil, as specified for the 2020 WR250F.
    • Replace the fill cap.
  7. Check Oil Level:
    • Start the bike and let it idle for one to two minutes, then turn it off.
    • Wait a few minutes for oil to settle. Check the oil level using the sight glass (on the right engine case). The oil should be between the minimum and maximum marks.
    • Add or remove oil as needed to achieve the correct level.
  8. Final Inspection:
    • Inspect for leaks around the drain bolt, filter cover, and strainer.
    • Reinstall the skid plate if removed. Clean up any spills with shop towels and contact cleaner.

Special Call-Outs for 2020 Yamaha WR250F Owners

  • Oil change interval: Yamaha recommends oil change intervals by mileage, but for off-road use, change the oil about every 6 engine hours to keep the engine in peak condition.
  • Oil capacity: 0.8 quarts is sufficient for both the engine and transmission, as both share oil in this model.
  • Strainer maintenance: Always check and clean the oil screen (strainer) during each change; neglecting this can result in oil starvation or engine damage.
  • Sight glass: Use the sight glass–not just the dipstick–to verify oil level for precise results specific to the WR250F.
  • Engine warm-up: Proper warming before draining improves flow and ensures maximum removal of old oil.

Extra Tips

  • If you don't have a new crush washer, inspect the old one for damage or flattening and replace if in doubt—leaking oil is a common result of reusing tired washers.
  • Use only high-quality 10W-40 oil compatible with wet clutches and API MA-/MA2 rated for motorcycle engines.
  • Keep detailed records of each oil change, noting hours and conditions—this helps with future maintenance and resale value.

With the right tools and proper attention to detail, the 2020 Yamaha WR250F oil change is straightforward and will help your bike perform reliably on every ride. For all your maintenance gear and OEM parts, trust MotoSport.com—your source for keeping your dirt bike in top shape.

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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.