How to Change the Oil in a 2020 Honda CRF125FB
Shop parts for a 2020 Honda CRF125FB Dirt Bike.
This guide is proprietary to MotoSport.com and will walk you through everything you need to change the oil on your 2020 Honda CRF125FB (Big Wheel). The steps and specs outlined here will help ensure a smooth, mess-free, and professional oil change, while highlighting key model-specific tips.
Tools and Supplies Needed
- 1 liter (1.06 US quarts) of 10W-30 or 10W-40 motorcycle-specific oil (Honda GN4 10W-30 or equivalent is commonly recommended)
- Drain pan (to catch old oil)
- 17mm socket with extension (a socket wrench is necessary to reach past the skid plate)
- Torque wrench (recommended; spec is 18 ft-lbs or 216 in-lbs for the drain bolt)
- New crush washer for the drain bolt (recommended but not strictly required every change)
- Funnel (helpful, especially if you don’t have very steady hands)
- Clean rag (to wipe drips or spills)
Special Call-Outs for the 2020 Honda CRF125FB
- No oil filter: This model does not have an oil filter. That means regular oil changes are extra important for engine life and performance. Plan to change the oil every 10 hours of riding, or more often for harsh/dirty conditions.
- Oil fill capacity: You need exactly 1 liter of oil for a routine change. After a complete engine rebuild, you may require slightly more (about 100-200cc more).
- Wet clutch: This bike uses shared engine/transmission oil for lubrication and clutch operation, so always use motorcycle-specific oil formulated for wet-clutch systems.
- No need to screw in dipstick when checking oil level: When checking with the dipstick, just insert it—do not screw it in.
Step-by-Step Instructions
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Warm up the engine
- Start the bike and let it idle for a few minutes. Warm oil will flow more easily and carry away more contaminants.
- Turn off the engine and let it sit for a minute or two.
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Secure the bike
- Place the CRF125FB on a stand so it’s upright and level.
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Remove the drain plug
- Locate the 17mm drain bolt on the bottom of the engine (under the skid plate).
- Place the drain pan underneath.
- Remove the drain bolt using a 17mm socket (preferably with extension for easier reach). Allow oil to drain completely until it becomes a slow drip.
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Replace the crush washer and reinstall drain bolt
- It’s good practice to install a new crush washer on the drain bolt to prevent leaks.
- Screw the drain bolt back in by hand to avoid cross-threading.
- Tighten the drain bolt to 18 ft-lbs (216 in-lbs) with a torque wrench.
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Add new oil
- Remove the oil fill cap/dipstick located on the right side of the engine.
- Using a funnel, pour in exactly 1 liter (1.06 US quarts) of 10W-30 or 10W-40 motorcycle oil.
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Check oil level
- Insert the dipstick (do not screw in), remove and check the oil level. It should be at or near the top mark. If it’s low, top off carefully.
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Start and inspect
- Replace the oil cap and start the engine for a minute to circulate the oil.
- Shut off the engine, wait a few minutes, then re-check the oil level in the same way, topping off if necessary.
- Make sure to inspect for any oil leaks around the drain bolt.
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Dispose of old oil responsibly
- Pour the used oil into a suitable container and bring it to a recycling center or auto parts store with an oil recycling program.
Additional Tips
- If you ride in dusty or muddy conditions, change oil more frequently.
- Keep a record of your oil changes for maintenance tracking.
- For the first few rides after an oil change, check for leaks at the drain bolt and fill plug.
- If you experience clutch issues, check that you are using the recommended oil—incorrect oil can cause clutch slippage.
Conclusion
The 2020 Honda CRF125FB makes oil changes simple—no oil filter, a single drain bolt, and a clearly marked dipstick. With the right tools and these MotoSport.com instructions, you’ll keep your engine running strong and long.
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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.