How to Change the Oil in a 2021 Honda CRF125FB: MotoSport.com Guide
Shop parts for a 2021 Honda CRF125FB Dirt Bike.
Regular oil changes are critical for maintaining the performance and longevity of your 2021 Honda CRF125FB. Unlike many other dirt bikes, the CRF125FB does not have an oil filter, so clean oil is essential to protect your engine’s working parts. Below is a comprehensive, step-by-step guide specific to the CRF125FB, including tools required, unique model tips, and expert advice to make your maintenance easy and efficient.
Tools & Materials You’ll Need
- 10W-30 or 10W-40 motorcycle-specific oil (Honda GN4 or equivalent, oil capacity: 0.85L/0.9 US quart)
- 17 mm socket and ratchet (deep well or use an extension for clearance)
- Torque wrench (capable of settings to 18 ft-lbs OR 216 in-lbs)
- Oil drain pan
- Funnel (optional, but recommended for cleaner pouring)
- New drain bolt crush washer (always replace to prevent leaks)
- Clean rag or shop towel
Before You Begin
- Warm up the engine– Run the bike for 3-5 minutes. This will allow the oil to thin and drain thoroughly.
- Stabilize the Bike– Position your CRF125FB on its side stand or, if possible, a bike stand to keep it upright and level.
Step-by-Step Oil Change Process for 2021 Honda CRF125FB
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Prepare the Area
- Ensure you are on a firm, level surface.
- Gather all your tools and materials for easy access.
- Place the oil drain pan beneath the crankcase to catch all the old oil.
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Remove the Filler Cap
- Clean around the oil fill cap/dipstick area to prevent debris from getting inside the engine.
- Unscrew and remove the dipstick/oil fill cap (right side of engine).
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Drain the Oil
- Using a 17 mm socket, loosen and remove the drain bolt located at the bottom of the engine.
- Allow all the oil to drain into your pan. Let the bike sit for a few minutes to ensure complete drainage.
- Tip: Replace the crush washer on the drain bolt with a new one each time you change the oil for a secure, leak-free seal.
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Reinstall the Drain Bolt
- Install the drain bolt with the new washer.
- Tighten to 18 ft-lbs (216 in-lbs). Avoid over-tightening, which can strip threads or crush the washer excessively.
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Add New Oil
- Position a funnel in the oil filler hole and slowly pour in 0.85 liters (0.9 US quartz) of 10W-30 or 10W-40 motorcycle oil specifically designed for wet clutch systems.
- Tip: Add oil gradually to avoid overfilling. These engines do not use an oil filter, so precise filling is important.
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Check Oil Level (Model-Specific Call-Out)
- Do NOT screw in the dipstick when checking the level. Insert it until it seats, then remove to read. This is a unique feature on the 2021 CRF125FB and similar CRF125F models.
- With the bike perfectly upright, the oil should be between the upper and lower level marks on the dipstick. If low, add a small amount and recheck.
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Final Steps
- Start the engine and let it run for 3-5 minutes to circulate the new oil.
- Shut off the engine, allow it to sit for 2-3 minutes, and recheck the oil level as above.
- Top off if necessary. Do NOT overfill.
- Check for leaks at the drain plug and filler cap area.
- Dispose of used oil responsibly at a local recycling facility or auto parts store.
2021 Honda CRF125FB-Specific Tips & Callouts
- No oil filter: Oil must be changed regularly (every 10 hours of riding is recommended).
- Oil capacity: 0.85 liters (0.9 US quarts). Using more may cause excess crankcase pressure and leaks.
- Dipstick procedure: Always check with the dipstick not screwed in and bike vertical.
- Recommended Oil: Only use motorcycle oil formulated for wet clutches—using automotive oil will affect clutch performance.
- Torque spec for drain bolt: 18 ft-lbs (216 in-lbs). Over-tightening may strip the threads or crack the case.
- Crush washer: Replace every change to ensure a proper seal.
When To Change Oil On Your 2021 CRF125FB
- After the initial break-in period (first few hours on a brand-new bike).
- Every 10 hours of riding or at least every season, whichever comes first. More frequent changes (every 5-7 hours) are advisable in harsh, dirty, or mud-heavy riding conditions.
Conclusion
Changing the oil on your Honda CRF125FB is a straightforward maintenance task and a key to keeping your bike in prime condition. For riders who want their bikes to deliver consistent performance and reliability, regular oil changes using the correct process and materials is a must. Remember, MotoSport.com has everything you need—genuine Honda oil, precision tools, and maintenance parts delivered to your door for a hassle-free experience.
Related Shopping Categories
Shop Motor Oil for a 2021 Honda CRF125FB Dirt Bike.
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Shop Oil Drain Pans for a 2021 Honda CRF125FB Dirt Bike.
Shop Tools for a 2021 Honda CRF125FB Dirt Bike.
Shop Oil Fillers and Drain Plugs for a 2021 Honda CRF125FB Dirt Bike.
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.