How to Change the Oil in a 2015 Honda CRF125FB

Shop parts for a 2015 Honda CRF125FB Dirt Bike.

Regular oil changes are critical to keeping your 2015 Honda CRF125FB running smoothly, especially since these models do not use an oil filter. This makes the oil even more important for trapping and removing engine contaminants, so stick to a strict maintenance schedule for optimal performance.

Tools and Materials Needed

  • 1 Quart of motorcycle-specific oil (Honda GN4 10W-30 or 10W-40 is recommended. Must be JASO MA compliant for wet clutches.)
  • 17mm socket (deep well or with extension is ideal)
  • Socket wrench
  • Oil drain pan
  • Oil funnel
  • Clean shop towels/rags
  • New crush washer for the drain bolt (recommended, not required every change)
  • Torque wrench (optional, for precise tightening)
  • Service stand (makes leveling the bike easier)

Steps to Change the Oil

  1. Warm Up the Engine
    • Start your 2015 CRF125FB and let it idle for 3-5 minutes. Warm oil drains more easily and removes more contaminants.
  2. Stabilize and Prepare the Bike
    • Turn off the engine. Place the bike on a stand or have someone help keep it upright and level, never on the side stand.
    • Remove the oil fill cap/dipstick on the right side to allow oil to drain freely.
  3. Locate and Remove the Drain Bolt
    • The drain bolt is centered at the bottom of the engine, easily accessed through a notch in the skid plate or frame.
    • Slide an oil pan under the engine to catch old oil.
    • Using a 17mm socket, loosen and remove the drain bolt. Be careful, as the oil may be hot.
    • Allow all oil to drain completely (wait a few minutes).
  4. Inspect and Replace the Crush Washer
    • Inspect the crush washer on the drain bolt for wear or damage. Replace if necessary to prevent leaks.
  5. Reinstall and Torque the Drain Bolt
    • Reinstall the drain bolt with the clean or new crush washer.
    • Tighten to 18 ft-lbs (216 in-lbs) using a torque wrench if available. Do not overtighten.
  6. Add New Oil
    • Insert a funnel into the oil fill hole.
    • Add 0.9 quart (850cc) of motorcycle-specific oil.
    • Do not install the dipstick yet.
  7. Check Level and Adjust
    • With the bike level, insert the dipstick without screwing it in. Remove and check the oil level; it should be at the “full” mark.
    • If needed, top off oil until you reach the correct level.
  8. Run the Engine and Recheck
    • Start the engine, let it idle for 3-5 minutes, then turn it off and let it sit for 2-3 minutes.
    • Re-check the oil level with the dipstick as before, adjust if necessary.
  9. Clean Up and Dispose of Old Oil
    • Wipe off any oil residue around the drain bolt and fill area.
    • Properly dispose of used oil and materials at a recycling center.

2015 CRF125FB-Specific Call-Outs and Tips

  • No oil filter:— The CRF125FB does not use an oil filter, so frequent oil changes are crucial–generally every 10 hours of riding or more often in dirty conditions.
  • Crush washer:— Replace the crush washer on the drain bolt if used, to avoid leaks.
  • Oil type:— Use only motorcycle-specific oil compatible with wet clutches (JASO MA rated).
  • Dipstick method:— When checking oil, do not screw the dipstick in–just insert it until it touches, then remove to read level.
  • Capacity:— The 2015 CRF125FB requires about 0.9 quart (850cc) of oil.
  • Tightening torque:— The drain bolt should be tightened to 18 ft-lbs (216 in-lbs).

Maintenance Reminders

  • Stay ahead of schedule: Replace oil at shorter intervals for longevity and performance–especially important with no oil filter.
  • Write down the date and riding hours when performing a change for future reference.

Following these steps will ensure your 2015 Honda CRF125FB stays in peak condition every ride. For more exclusive guides and top-tier parts, visit MotoSport.com.

These instructions are proprietary, based on expert knowledge and available public information tailored specifically for MotoSport.com and Honda CRF125FB owners.

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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.