How to Change the Oil in a 2021 Honda CRF250F – The Complete MotoSport.com Guide

Shop parts for a 2021 Honda CRF250F Dirt Bike.

Whether you ride hard every weekend or hit the trails occasionally, regular oil changes are critical to keeping your 2021 Honda CRF250F running strong. This trusted step-by-step guide will walk you through the process, list the required tools, and point out model-specific tips every CRF250F owner should know.

Tools and Supplies Needed

  • Fresh oil: Honda GN4 10W-30 or equivalent; 1.7 quarts required for the 2021 CRF250F
  • Oil filter: OEM part number 15412-HM5-A10
  • 12mm socket and ratchet
  • 8mm socket (for oil filter cover bolts)
  • Phillips screwdriver
  • Drain pan
  • Funnel
  • Clean rags or paper towels
  • Torque wrench (recommended for drain bolt reinstallation)
  • Rubber gloves (optional, for keeping hands clean)

Preparation Steps

  • Start the bike and let it idle for 3-5 minutes. Warming up the engine ensures the oil drains out smoothly and completely.
  • Shut down the engine, place the bike on a level surface with the kickstand down, and allow it to cool just enough for safe handling.
  • Locate your drain pan under the engine, directly beneath the drain plug. On the CRF250F, the skid plate has an oil drain opening, so you do not need to remove the plate.

The Oil Change Process

  1. Remove the Filler Cap/Dipstick
    Unscrew and remove the oil filler cap/dipstick on the right side of the engine. This step allows air to flow and helps oil drain faster.
  2. Drain the Old Oil
    - Use your 12mm socket and ratchet to remove the drain plug at the bottom of the engine.
    - Let the oil drain completely–this may take several minutes. Tilting the bike side to side can help evacuate every last bit.
    - Inspect the drain plug and ensure the crush washer is present and in good condition (reuse it up to 2-3 times or replace if it’s damaged).
  3. Remove and Replace the Oil Filter
    - With your 8mm socket, remove the bolts holding the oil filter cover.
    - Gently pry the cover off; the old filter and a spring may come out. Note the orientation: the oil filter will be marked “Spring Side Toward Engine”.
    - With a clean rag, wipe the filter cavity and the cover.
    - Insert the new filter with the spring side toward the engine, double-checking alignment as specified.
    - Reinstall the cover and tighten the bolts by hand first; then snug evenly, avoiding over-tightening. A torque spec is roughly 8 ft-lbs (11 Nm).
  4. Reinstall the Drain Plug
    Thread the drain bolt by hand, then use the torque wrench to tighten to 18 ft-lbs (25 Nm). Do not crossthread or overtighten.
  5. Add Fresh Oil
    - Set the funnel in the filler opening and pour in 1.7 quarts of oil.
    - Insert the dipstick without threading it in, then check level. Top off if needed but avoid overfilling.
  6. Check for Leaks and Final Level
    - Replace and tighten the dipstick.
    - Start the engine and idle for a couple of minutes. Shut it off again, let it sit for a moment, then check for leaks at the drain plug and filter cover.
    - Once the bike cools a bit, recheck oil level on dipstick and adjust if necessary.

Model-Specific Callouts and Tips for the 2021 CRF250F

  • Oil Capacity: The 2021 CRF250F takes exactly 1.7 quarts of oil when changing the filter. Overfilling can cause crankcase issues.
  • Oil Filter Direction: The oil filter has a marking to ensure correct installation: spring side faces the engine. Installing it backwards can cause oil starvation.
  • Drain Plug Location: The drain plug is easily accessible through the skid plate’s opening–no need to remove the plate unless accessing for other maintenance.
  • Crush Washer Reuse: The OEM crush washer is reusable a couple of times, but always inspect for cracks or flattening. Replace if suspecting any issue.
  • Filter Cover Torque: Tighten filter cover bolts evenly and do not overtighten—they’re small and can strip or crack if handled roughly.
  • For best performance, use only oil and filters recommended in your owner’s manual.

Final Steps and Safe Disposal

  • Check your bike’s performance after the oil change–listen for unusual noises and monitor the dipstick regularly over the next couple of rides.
  • Dispose of old oil and filters responsibly. Most auto parts stores and recycling centers will accept used oil for recycling.

Maintaining your 2021 Honda CRF250F’s oil is the foundation of engine longevity and performance. With the right tools, supplies, and careful attention to detail, you can take pride in maintaining your bike like a pro—on your schedule, at your garage.

For more expert guides, high-performance parts, and OEM supplies, trust MotoSport.com, your dirt bike maintenance partner.

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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.