How to Change the Oil in a 2020 Honda CRF450R

Shop parts for a 2020 Honda CRF450R Dirt Bike.

Regular oil changes are crucial for keeping your 2020 Honda CRF450R running strong. Honda recommends changing the oil every six races or 15 hours of use. Follow this comprehensive guide from MotoSport.com to expertly perform this maintenance and keep your bike in top condition.

Tools and Parts Needed

  • 8mm and 10mm sockets (socket wrench or ratchet compatible)
  • Honda 20W-50 engine oil (or oil recommended in your owner's manual; typically about 1.2 quarts)
  • Honda oil filter (specific to CRF450R, 2020)
  • Crush washer (for the drain bolt)
  • O-ring (for the oil filter cover)
  • Funnel
  • Torque wrench
  • Drain pan
  • Clean rags
  • Gloves (for cleanliness and grip)
  • Safety glasses (recommended for safety)

Steps to Change the Oil

  1. Warm Up the Engine
    Start the motorcycle and let it run for 1-2 minutes. This helps the oil warm up, making it flow out more easily and carry away contaminants. Shut the engine off.
    Tip: Always work in a well-ventilated space.
  2. Remove the Left Side Engine Guard
    Use the 8mm socket to remove the left-side engine guard for easier access to the oil filter cover.
    CRF450R Specific: The guard can sometimes hold residual dirt–wipe clean to prevent contamination during reassembly.

  3. Open the Oil Filler Cap
    Remove the oil filler cap. This allows the crankcase to vent, promoting faster draining of the oil.

  4. Drain the Old Oil
    Place your drain pan under the crankcase. Use your 10mm socket to remove the oil drain bolt (located at the lower rear of the crankcase). Remove the crush washer as well–inspect, and always replace if it is damaged or worn.
    Let the oil fully drain. Tilt the bike upright for a short time once the flow slows to get every last drop.

  5. Replace the Crush Washer and Reinstall the Drain Bolt
    Install a new crush washer on the drain bolt. This prevents leaks and ensures a proper seal. Thread the bolt back in by hand, then torque to the manufacturer–s recommended specification (check your manual; generally around 13 lb-ft).

  6. Remove and Replace the Oil Filter
    Remove the oil filter cover by loosening the bolts with a 8mm socket. Take out the old oil filter and O-ring.
    Lubricate the new O-ring with a dab of fresh oil and install it with the new oil filter.
    Reinstall the cover and torque the bolts to 9 foot-pounds.

  7. Reinstall the Engine Guard
    Reattach the left side engine guard using your 8mm socket.
    Double check that no rags or tools were left behind.

  8. Refill with Fresh Oil
    Place your funnel in the filler opening and pour in fresh Honda 20W-50 engine oil. The 2020 CRF450R typically takes 1.2 quarts (check your manual for confirmation).[2] Replace the oil filler cap.
  9. Start and Check for Leaks
    Start the motorcycle and let it idle for a minute. Shut it off and let it sit for a minute.
    Examine the drain bolt and filter area for any leaks.
    Check the oil level through the sight glass under the oil filter cover–top up if needed.

  10. Dispose of Used Oil and Filter Properly
    Used engine oil and filters must be disposed of at a waste disposal facility–never dump them down the drain or in the trash.
  11. Final Checks
    Make sure all bolts are tightened to spec, there are no oil leaks, and oil is at the correct level.

Special Call-Outs for the 2020 Honda CRF450R

  • The 2020 CRF450R uses just over 1 quart of oil–avoid overfilling as this can increase crankcase pressure and potentially cause leaks or performance issues.

  • Always use a new crush washer on the drain bolt to prevent leaks.

  • Check your filter cover O-ring is in good condition and lubricate with oil before reassembly–this model—s filter cover is prone to seep if the O-ring is pinched or dry.

  • Use only oil and filters intended for the CRF450R for optimal engine protection.

Helpful Reminders

  • Change your oil more often if riding in muddy, wet, or especially dusty conditions as the oil will degrade more rapidly.
  • Keep a record of your oil changes and what type of oil and filter you used.
  • Regularly check for oil leaks after service and before every ride.

Performing routine oil changes on your 2020 Honda CRF450R ensures maximum performance and longevity–always follow best practices and consult your owner—s manual for any spec variances.

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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.