How to Change the Oil in a 2019 Honda CRF125FB

Shop parts for a 2019 Honda CRF125FB Dirt Bike.

Changing the oil in your 2019 Honda CRF125FB is an essential part of routine maintenance, helping to ensure smooth performance and long engine life. This step-by-step guide will take you through the process, provide important model-specific call-outs, and list the tools you need to complete the job safely and efficiently. This guide is proprietary to MotoSport.com and designed for new and experienced riders alike.

Tools & Materials Needed

  • 17mm socket (deep well or with extension recommended)
  • Socket wrench
  • New engine oil (10W-30 or 10W-40 motorcycle-specific oil, Honda GN4 10W-30 recommended)
  • 1 liter (1.06 quart) measuring container
  • Drain pan for used oil
  • Funnel (optional but helps avoid spills)
  • New crush washer (recommended for drain bolt)
  • Shop rags or paper towels
  • Torque wrench (18 ft-lbs or 216 in-lbs for drain bolt)

Step-by-Step Instructions

  • Warm Up the Engine
    • Start the bike and let it idle for 3-5 minutes to thin the oil, making it easier to drain. Shut off the engine and let it cool slightly before handling.
  • Position the Bike
    • Stand the bike upright and place it on a level surface or a bike stand for stability.
  • Remove the Drain Plug
    • Locate the oil drain bolt under the engine (17mm head). Position the drain pan beneath it to catch the oil.
    • Carefully loosen and remove the drain bolt. Allow all the oil to drain completely, which may take several minutes.
    • Inspect and replace the crush washer on the drain bolt to prevent leaks when you reinstall it.
  • Reinstall the Drain Plug
    • Once drained, clean the area around the plug and threads. Reinstall the drain bolt (with new crush washer) and tighten it to 18 ft-lbs (216 in-lbs) using a torque wrench.
  • Add New Oil
    • Remove the oil fill cap/dipstick on the right side of the engine.
    • Using a funnel, pour in 0.9 liters (900 ml) of high-quality 10W-30 or 10W-40 motorcycle oil.
    • Honda recommends Honda GN4 10W-30, but other motorcycle-specific brands work as well.
  • Check Oil Level
    • With the bike upright, insert the cleaned dipstick into the fill hole without screwing it in.
    • Remove the dipstick and check that the oil is at or near the upper mark.
    • If needed, add small amounts until the correct level is reached.
  • Run and Re-Check
    • Start the engine and let it idle for 3-5 minutes to circulate the new oil.
    • Shut off the bike and wait 2-3 minutes for the oil to settle, then check the level again as above.
    • Top off if necessary, but do not overfill.
  • Clean Up & Dispose Properly
    • Wipe up any oil drips. Properly dispose of the used oil at a recycling facility.

2019 Honda CRF125FB Specific Call-Outs

  • No Oil Filter:
    • The 2019 CRF125FB does not have an oil filter. This makes oil changes straightforward but increases the importance of changing oil at recommended intervals (every 10 hours of riding or at least every season) to keep internal engine parts clean and lubricated.
  • Oil Capacity:
    • The correct oil amount is 0.9 liters (900 ml). Do not overfill, as excess oil can cause engine issues.
  • Dipstick Method:
    • Always check oil with the dipstick lightly resting in the threads—do not screw it in when measuring the oil level for accuracy.
  • Drain Bolt Torque:
    • Reinstall the drain bolt with a new crush washer and torque it to 18 ft-lbs (216 in-lbs) to avoid stripping threads or oil leaks.

Tips for Best Results

  • Warm up the bike before draining to help the oil flow out smoothly.
  • Have extra shop towels handy for spills or drips.
  • Record your oil changes and hours ridden to ensure timely future service.
  • Select quality oil formulated for 4-stroke motorcycles for best protection.
  • Always dispose of used oil responsibly.

By following these steps and being mindful of the model-specific details, you’ll ensure your 2019 Honda CRF125FB continues to run smoothly on every ride. For all your service parts and gear, trust MotoSport.com—the leader in dirt bike performance and maintenance products.

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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.