How to Change the Oil in a 2020 Honda CRF125F

Shop parts for a 2020 Honda CRF125F Dirt Bike.

Changing the oil in your 2020 Honda CRF125F is a quick and essential maintenance step. Regular oil changes help extend engine life, keep shifting smooth, and protect your clutch thanks to the shared oil bath in these dirt bikes. Follow this guide for a precise, manufacturer-approved process and smart model tips, all proprietary to MotoSport.com.

Tools and Materials Needed

  • 1 quart (0.9 quart/850cc) of 10W-30 or 10W-40 motorcycle oil (ensure it's suitable for motorcycles with a wet clutch)
  • Oil drain pan
  • 17mm socket (a deep socket or an extension can help reach past the skid plate)
  • Ratchet or torque wrench
  • Funnel (optional, but makes pouring easier)
  • Replacement crush washer for the drain plug (strongly recommended)
  • Shop rags or paper towels for cleaning up spills
  • Gloves (optional, for cleaner hands)

Step-By-Step Guide

  1. Warm Up the Engine
    • Start your CRF125F and let it run for 2–3 minutes. This helps the oil flow more easily, ensuring more thorough draining.
  2. Stabilize the Bike
    • Turn off the engine and place the bike upright on a level stand. A lift or small bucket works; keeping the bike level ensures you get accurate drainage and refill.
  3. Locate the Oil Drain Plug
    • Find the drain plug centered underneath the engine. The stock skid plate has a cutout for easy access to the plug.
  4. Remove the Drain Plug
    • Place your oil pan under the drain plug.
    • Use your 17mm socket and ratchet to remove the drain plug. Allow the oil to drain completely. This may take several minutes.
  5. Inspect and Replace Crush Washer
    • Check the crush washer on the drain plug. Replace it with a new one to prevent leaks. This step is especially important for the CRF125F as the washer ensures proper sealing and torque consistency.
  6. Reinstall the Drain Plug
    • Once the oil has fully drained, reinstall the drain plug and new crush washer by hand to avoid cross-threading.
    • Tighten the plug to 18 ft-lbs (or 216 in-lbs) using a torque wrench for accuracy and to avoid damage.
  7. Remove the Filler Cap
    • The oil fill cap is located on the right side of the engine. Remove it to add new oil.
  8. Add Clean Oil
    • Using a funnel, add up to 0.9 quart (850cc) of fresh, motorcycle-specific 10W-30 or 10W-40 oil. The Honda CRF125F does not have an oil filter, so quality and regular oil changes are especially crucial.
    • Do not overfill; pour the oil slowly and check the sight glass or dipstick.
  9. Check Level
    • On this model, insert the dipstick (but do not screw it in), remove it, and verify the oil reaches the marked level. Top off if needed.
  10. Run the Engine and Recheck
    • Replace and secure the filler cap. Start the engine and let it idle for a minute.
    • Shut off the engine and wait 1 minute, then recheck the oil level following the same process. Top off if needed.
  11. Dispose of Old Oil Properly
    • Take used oil to a recycling center or automotive store that accepts oil. Do not dispose of it in household trash or pour it down a drain.

2020 Honda CRF125F-Specific Notes

  • No Oil Filter: The CRF125F does not have a replaceable oil filter, making oil cleanliness and frequent changes critical. Perform oil changes every 10 hours of riding or at least once per season.
  • Wet Clutch Compatibility: Always use motorcycle oil formulated for wet clutches. Automotive oils can cause clutch slippage.
  • Drain Plug Accessibility: The stock skid plate has a notch for easy drain plug access, but a 17mm socket (preferably a deep socket or with an extension) is still needed for clearance.
  • Torque Specification: Use precisely 18 ft-lbs (216 in-lbs) when tightening the oil drain plug.
  • Oil Capacity: Add no more than 0.9 quart (850cc) of new oil; overfilling can cause excess crankcase pressure or leaks.

Final Tips and Maintenance Intervals

  • Keep a log of all oil changes, including hours and type of oil used for warranty and resale value.
  • If you're new to maintenance, MotoSport.com offers all tools and parts in one accessible location.
  • Contact your local dealer or MotoSport experts if you see gray/silver particles in oil or have repeated issues with oil clarity.

For all your genuine Honda parts, fluids, and maintenance gear, trust MotoSport.com—your authority in powersports care.

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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.