How to Change the Oil in a 2026 Honda CRF125FB: Step-by-Step Guide

Shop parts for a 2026 Honda CRF125FB Dirt Bike.

Regular oil changes are essential for the long life and smooth operation of your 2026 Honda CRF125FB. The process for changing the oil remains consistent with previous CRF125F/FB models, making it a straightforward DIY maintenance task for most owners. Below you'll find the tools needed, a detailed step-by-step guide, and model-specific notes to ensure optimal results on your 2026 CRF125FB.

Tools and Supplies Needed

  • 17mm socket and ratchet (preferably deep well or with an extension for bolt clearance)
  • Oil drain pan
  • Shop towels or rags
  • Funnel
  • Honda GN4 10W-30 or 10W-40 motorcycle oil (1 quart, you will use about 0.9 US qt or 0.85 L)
  • New drain bolt washer (crush washer/sealing washer)
  • Torque wrench (to ensure correct drain bolt torque)
  • Gloves (optional, but recommended for cleanliness)

Step-by-Step Instructions

  1. Warm up your engine. Start your CRF125FB and let it idle for about 3-5 minutes. Warming the engine helps the oil drain thoroughly. Turn off the engine and let it sit for 2-3 minutes to allow the oil to settle.
    Note: Always perform oil changes on a stable, level surface, using the bike's side stand or, preferably, a maintenance stand for balance.
  2. Remove the oil fill cap/dipstick. Unscrew the oil fill cap and dipstick assembly on the right side of the engine to allow the oil to drain freely and to check oil level after refilling.
  3. Drain the old oil.
    • Place your drain pan directly beneath the engine's oil drain bolt, located at the bottom of the engine (crankcase).
    • Use the 17mm socket and ratchet to remove the oil drain bolt and its sealing washer. Allow all oil to fully drain into the pan.
    • Inspect the drain bolt and replace the crush/sealing washer with a new one to ensure a leak-free seal.
  4. Reinstall and torque the drain bolt. Once draining is complete, reinstall the drain bolt with the new washer. Use your torque wrench to tighten it to 18 lbf·ft (24 N·m).
    Tip: Avoid over-tightening to prevent damaging the engine case or threads.
  5. Add new oil.
    • Insert a funnel into the oil fill port and pour in 0.9 US qt (0.85 L) of recommended motorcycle oil. Do not overfill.
    • Reinstall the oil fill cap/dipstick securely.
  6. Check oil level.
    • Start the engine and let it idle for 3-5 minutes to circulate the new oil.
    • Shut the engine off, wait 2-3 minutes, then check oil level. Set the bike upright (not on the side stand) to get an accurate reading.
    • Remove the dipstick, wipe clean, insert it (do not screw in), then remove again to check the oil. Oil should be at or near the upper level mark. Add a small amount as needed if the oil is below the mark.
  7. Final steps.
    • Wipe off any oil drips or spills.
    • Inspect around the drain bolt and case for any leaks.
    • Dispose of used oil responsibly at a certified recycling center.

Model-Specific Call-Outs for the 2026 Honda CRF125FB

  • No oil filter on CRF125FB: The CRF125FB (like all CRF125F models) does not use a replaceable oil filter. Frequent oil changes (every 10 hours of engine runtime or after every few rides) are important for longevity, particularly since riding in dirty or dusty conditions can quickly contaminate engine oil.
  • Correct oil level check procedure:
    • Always check the oil level with the bike upright and the dipstick inserted (not screwed in). This ensures accuracy and prevents over- or under-filling.
  • Crush washer must be replaced:
    • Honda recommends replacing the sealing washer on the drain bolt at each oil change to prevent leaks and maintain proper sealing.
  • Recommended oil and quantity:
    • Use 10W-30 or 10W-40 motorcycle-specific oil. The correct fill quantity is 0.9 US quarts (0.85 L).
  • Disposal of used oil:
    • Never pour oil down the drain or onto the ground. Take it to your local automotive shop or recycling center.
  • Frequency:
    • Change the oil every 10 hours of riding, or as specified in the owner's manual. If you ride in muddy, sandy, or dusty conditions, decrease the interval.

Conclusion

Changing the oil on a 2026 Honda CRF125FB is a beginner-friendly task that promotes engine health and prolongs the life of your bike. By following these detailed instructions and adhering to the recommended intervals, you ensure your dirt bike performs at its best—on the track or trail. For genuine Honda parts and oil, always shop MotoSport.com, your source for OEM and performance parts tailored to your ride.

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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.