How to Change the Oil in a 2021 Honda CRF250R

Shop parts for a 2021 Honda CRF250R Dirt Bike.

Changing the oil on your 2021 Honda CRF250R is one of the most important routine maintenance tasks you can perform to keep your bike running at peak performance. Follow these MotoSport.com tips for a smooth, clean, and efficient oil change tailored specifically for your model.

Tools and Materials Needed

  • 8 mm T-handle or socket wrench
  • 6 mm Allen wrench
  • Oil drain pan
  • New oil filter (KN-116 or equivalent)
  • 1.0 – 1.1 liters of 10W-40 motorcycle oil (synthetic or conventional)
  • Rags or paper towels
  • Funnel
  • Gloves (optional for cleanliness)
  • Torque wrench (optional but recommended for precise tightening)

Oil Change Interval

  • Honda recommends changing the engine oil on the CRF250R every race or about every 2.5 engine hours. For moderate trail or limited riding, refer to the Honda maintenance schedule for detailed intervals.4

Step-by-Step Oil Change Guide

  1. Start and Warm Up the Engine

    Run the engine for 3-5 minutes to get the oil warm. Warm oil drains more completely, carrying dirt and contaminants out with it.

  2. Position the Bike Securely

    Place your CRF250R on a bike stand or level surface. Make sure it is stable before starting the oil change.

  3. Remove the Skid Plate (if equipped)

    If your bike has a skid plate, remove it using the appropriate size wrench to access the drain bolt easily.1

  4. Drain the Old Oil
    • Locate the engine oil drain bolt on the left side, underneath the engine.
    • Place your oil pan directly underneath.
    • Use your 8 mm T-handle to remove the drain bolt.
    • Let the oil fully drain. You can gently rock the bike side to side to get every last bit of oil out.3
    • Inspect the drain bolt and its washer for any damage. Replace the washer if needed to ensure a proper seal.
  5. Replace the Drain Bolt

    Reinstall the drain bolt once all the oil has drained. Tighten to Honda's specified torque or just snug if you don’t have a torque wrench. Be careful not to overtighten, as this can strip the threads or crack the case.3

  6. Replace the Oil Filter
    • Locate the oil filter cover on the right side of the engine.
    • Remove the cover’s two 8 mm bolts.
    • Tip: Mark the orientation of the cover using a marker for easier reinstallation.3
    • Remove the old filter. Install the new oil filter (KN-116 or equivalent), ensuring it’s in the correct orientation.
    • Check the filter cover’s O-ring for damage and lightly oil it before reinstallation. Replace the O-ring if necessary.
    • Reattach the cover and tighten the bolts securely but do not overtighten.3
  7. Add New Oil
    • Remove the oil fill cap located on top of the engine.
    • Place a funnel into the filler hole and pour in approximately 1.0 – 1.1 liters of 10W-40 motorcycle oil (refer to your owner’s manual for the precise capacity).
    • Replace the oil fill cap securely.
  8. Check Oil Level
    • Start the engine and let it idle for about 30 seconds. Shut it off and wait a minute for the oil to settle.
    • With the bike on a level surface, check the oil level using the dipstick (or sight glass if equipped). Top off as needed.
  9. Dispose of Used Oil Properly

    Pour used oil and filter into a sealed container and take them to a local recycling center or auto parts store that accepts used oil.

CRF250R-Specific Call-Outs

  • This generation of CRF250R (2018–2021) uses a single shared engine oil compartment for the clutch and engine, so only one type of oil change and fill is required.1
  • Never confuse the engine oil drain bolt with the transmission drain plug (if you have a different model/year Honda). The CRF250R drain bolt is under the engine; the transmission drain plug is typically found elsewhere.2
  • Always ensure you are using a dirt bike-specific oil formulated for wet clutches.
  • Do not overtighten bolts—Honda’s engine components are made from lightweight alloys that are easily damaged by excess force.
  • If you notice any metallic shavings on the drain bolt’s magnetic tip, some is normal, but excessive metal may indicate internal wear and should be investigated.

Final Checks

  • Double-check for oil leaks around the drain bolt and filter cover after your first ride.
  • Keep a maintenance log of your oil changes, including date, oil type, and hours on the bike.

By following these steps, you’ll keep your 2021 Honda CRF250R running smoothly and maximize its engine life—ready for your next MotoSport.com adventure.

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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.