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2021 Honda CRF125F Overview
The 2021 Honda CRF125F is a cross / motocross motorcycle built around 124.9 cc of displacement. Under the tank sits a Single cylinder, four-stroke engine running Single Overhead Cams (SOHC) valve actuation, a compression ratio of 9.0:1. The bore and stroke measures 52.4 x 57.9 mm. 2021 Honda CRF125F delivers 10.2 Nm @ 4500 Revolutions of torque. From a practical standpoint, the 2021 CRF125F tips the scales at 88 kg, carries a 3.79-litre fuel tank, offers a seat height of 739 mm and spans a 1219 mm wheelbase. That's roughly 22 kg lighter than the average cross / motocross motorcycle in our database. Scroll down for the complete 2021 Honda CRF125F spec sheet covering every technical detail from suspension travel to tyre sizes.
2021 Honda CRF125F compared with other bikes in the Cross / motocross category
Here is how the 2021 Honda CRF125F stacks up against other bikes in the Cross / motocross category in our database. Each model counts once, using the model year closest to this one, and the comparison covers up to 200 models.
- Seat height of 739 mm is lower than that of 186 of the other 199 bikes in the Cross / motocross category.
- Only 9 of the other 58 bikes in the Cross / motocross category have a lower torque than the 10.2 Nm of the CRF125F.
- With 88 kg, the CRF125F has the 29th lightest wet weight of 129 bikes in the Cross / motocross category, 20% below the category average of 110 kg.
- Narrowing the field to the 97 models within five model years of it, the seat height of 739 mm is lower than that of 92 of the other 96.
Versus the 2020 model
The figures we track are unchanged from the 2020 model: peak torque, wet weight, displacement and seat height all match.
2021 CRF125F - Pros & Cons
Strengths
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🔧
Fuel injection: The fuel injection system delivers crisp throttle response and reliable cold starts regardless of altitude or temperature.
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🛑
Strong front braking: The single disc front brake gives excellent stopping power and responds well to aftermarket braided lines.
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📏
Accessible seat height: At 739 mm, the seat height is approachable for a wide range of rider heights and builds confidence in low-speed manoeuvring.
Considerations
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🛑
Drum rear brake: The drum rear brake is adequate but lacks the modulation and fade resistance of a disc setup found on more modern equivalents.
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⛽
Modest fuel capacity: The 3.79-litre tank means more frequent fuel stops on longer rides, which is worth planning around on touring routes.
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⚙️
Chain final drive upkeep: Chain final drive needs regular cleaning, lubrication and tension checks to get full life out of the sprockets.
Wear Points & Servicing Notes
Fuelling & injector care
Fuelling comes from fuel injection. Systems like this are largely maintenance-free beyond keeping fuel quality decent and injectors clear - a fuel-system cleaner every service interval is cheap insurance.
Valve clearance checks
Single Overhead Cams (SOHC) valve actuation on the CRF125F means clearances should be checked at the manufacturer's specified interval - they can tighten as mileage accumulates, and a light top-end tick is usually the first sign.
Brake disc and pad wear
The single disc front brake gives strong, progressive stopping power. Disc thickness and pad depth are worth checking at every tyre change, since worn pads can score the disc surface.
Suspension condition on used examples
Up front, the CRF125F runs 31mm telescopic fork and Pro-Link single-shock at the rear. On a used example, check fork seals for weeping oil and test the rear linkage for play - seals are a relatively cheap fix but useful when negotiating price.
Final drive maintenance
Final drive is by chain - expect to clean and lube it every few hundred kilometres and check tension regularly; a neglected chain wears the sprockets faster than the chain itself.
Frame & chassis check
The frame is Diamond, steel - worth a visual check for corrosion or impact damage around the head-stock and swingarm pivot on any used example, since frame damage is far costlier to fix than any service item.
Low-speed handling
At just 88 kg, the CRF125F is light enough to manhandle easily at a standstill - one of the practical advantages of its class.
CRF125F - Buying & Maintenance Guide
What to check before buying
When inspecting a used 2021 Honda CRF125F with its 124.9 cc cross / motocross, start with the basics: check the service book for oil change frequency, inspect the drivetrain for wear, and look for oil seepage around the engine casings and rocker covers. This model runs chain final drive, so check chain slack and sprocket tooth profile specifically - a worn sprocket is a cheaper fix now than after it's chewed up the next chain. Now 5 years old, this cross / motocross is as likely to show age-related wear (perished rubber, seized fasteners, degraded seals) as mileage-related wear. A cold start test is invaluable - a well-maintained CRF125F should fire up cleanly and settle to a smooth idle within a few seconds.
Oil and filter changes
Regular oil changes are the single most important maintenance task for the CRF125F's 124.9 cc single cylinder, four-stroke. Stick to the manufacturer's interval - typically every 6,000 km or once a year, whichever comes first. With a 9.0:1 compression ratio, running the octane grade specified in the manual matters more than on a lower-compression engine. Always use the correct viscosity grade as specified in the owner's manual.
Fuel system care
The CRF125F's fuel injection system is durable but benefits from quality fuel and the occasional use of a fuel-system cleaner additive. If the bike has been stored for more than three months, drain and replace the fuel to prevent varnish deposits in the injectors.
Valve clearance service
Check that valve clearances have been adjusted at the correct intervals on any used CRF125F. A bike with clearances out of spec doesn't always feel obviously wrong - but tight clearances accelerate valve seat wear. Ask for service documentation proving it's been done.
2021 Honda CRF125F - Frequently Asked Questions
What engine does the 2021 Honda CRF125F have?
The 2021 Honda CRF125F uses a Single cylinder, four-stroke engine with 124.9 cc of displacement.
How much does the 2021 Honda CRF125F weigh?
The 2021 Honda CRF125F weighs 88 kg. This is the manufacturer's wet figure.
How much torque does the 2021 Honda CRF125F produce?
The 2021 Honda CRF125F produces 10.2 Nm @ 4500 Revolutions of torque.
What is the fuel tank capacity of the 2021 Honda CRF125F?
The 2021 Honda CRF125F has a 3.79-litre fuel tank. At around 5-6 litres per 100 km, that is roughly 63-75 km between stops.
Is the 2021 Honda CRF125F suitable for shorter riders?
The 2021 Honda CRF125F has a seat height of 739 mm. This is a comfortable, accessible height for most riders.
What brakes does the 2021 Honda CRF125F have?
The 2021 Honda CRF125F uses single disc with hydraulic at the front and Expanding brake at the rear.
What tyre sizes does the 2021 Honda CRF125F use?
The front tyre size on the 2021 Honda CRF125F is 70/100-17.
Honda CRF125F Spec Evolution
The Honda CRF125F was produced across 10 model years (2014-2023). The table below highlights the key specifications that changed across the production run - useful whether you are comparing years or tracking down a specific variant.
| Specification |
2014 |
2015 |
2016 |
2017 |
2018 |
2019 |
2020 |
2021 |
2022 |
2023 |
| Seat Height |
785 mm / 30.9 in. |
785 mm / 30.9 in. |
735 mm / 28.9 in. |
735 mm / 28.9 in. |
735 mm / 28.9 in. |
735 mm / 28.9 in. |
739 mm / 29.1 in. |
739 mm / 29.1 in. |
739 mm / 29.1 in. |
739 mm / 29.1 in. |
| Fuel Capacity |
4.30 litres / 1.14 gallons |
4.30 litres / 1.14 gallons |
4.30 litres / 1.14 gallons |
4.30 litres / 1.14 gallons |
4.30 litres / 1.14 gallons |
4.30 litres / 1.14 US gallons |
3.79 litres / 1.00 US gallons |
3.79 litres / 1.00 US gallons |
4.50 litres / 1.19 US gallons |
3.79 litres / 1.00 US gallons |
| Ground Clearance (mm) |
264 mm |
264 mm |
219 mm |
219 mm |
219 mm |
219 mm |
211 mm |
211 mm |
211 mm |
211 mm |
| Ground Clearance (in.) |
10.4 inches |
10.4 inches |
8.6 inches |
8.6 inches |
8.6 inches |
8.6 inches |
8.3 inches |
8.3 inches |
8.3 inches |
8.3 inches |
| Fuel Control |
SOHC |
Single Overhead Cams (SOHC) |
Single Overhead Cams (SOHC) |
Single Overhead Cams (SOHC) |
Single Overhead Cams (SOHC) |
Single Overhead Cams (SOHC) |
Single Overhead Cams (SOHC) |
Single Overhead Cams (SOHC) |
Single Overhead Cams (SOHC) |
Single Overhead Cams (SOHC) |
| Displacement (cc) |
124.90 cc |
- |
- |
- |
- |
124.9 cc |
124.9 cc |
124.9 cc |
124.9 cc |
124.9 cc |
| Comments |
Model ID: CRF125FB |
Model ID: CRF125F |
Model ID: CRF125F |
Model ID: CRF125F |
Model ID: CRF125F |
Model ID: CRF125F |
Model ID: CRF125F. |
Model ID: CRF125F. |
Model ID: CRF125F. |
Model ID: CRF125F. |
| Brakes - Rear Diameter (mm) |
125 mm |
125 mm |
125 mm |
125 mm |
125 mm |
- |
- |
- |
- |
- |
Key Specifications
Engine
Single cylinder, four-stroke
Torque
10.2 Nm (1.0 kgf-m or 7.5 ft.lbs) @ 4500 Revolutions
Weight
88.0 kg / 194.0 lbs
Fuel Capacity
3.79 litres / 1.00 US gallons
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Full 2021 Honda CRF125F Specifications
Comments
Model ID: CRF125F.
Colours
Red
Warranty
Six Months transferable limited warranty
Ground Clearance (in.)
8.3 inches
Ground Clearance (mm)
211 mm
Seat Height
739 mm / 29.1 in.
Wheelbase
1219 mm / 48.0 in.
Height
1010 mm / 39.8 in.
Length
1770 mm / 69.7 in.
Width
740 mm / 29.1 in.
Fuel Capacity
3.79 litres / 1.00 US gallons
Wet Weight
88.0 kg / 194.0 lbs
Displacement (cc)
124.9 cc
Displacement (ci)
7.62 cubic inches
Engine Type
Single cylinder, four-stroke
Fuel Control
Single Overhead Cams (SOHC)
Bore x Stroke (in,)
2.1 x 2.3 inches
Bore x Stroke (mm)
52.4 x 57.9 mm
Fuel System
Injection. 22mm throttle bore
Compression Ratio
9.0:1
Emissions
Meets current California Air Resource Board (CARB) and EPA off-road emissions standards.
Ignition
Full Transistorized
Starter
Electric
Valve System
2
Final Drive
Chain (final drive)
Gearbox
4-speed
Primary Drive
Chain 13T/49T
Frame Type
Diamond, steel
Suspension - Front
31mm telescopic fork
Suspension - Rear
Pro-Link single-shock
Rake
27.3°
Trail
81 mm / 3.2 in.
Wheel Travel - Front
132 mm / 5.2 in.
Wheel Travel - Rear
140 mm / 5.5 in.
Brakes - Front
Single disc. Hydraulic.
Brakes - Rear
Expanding brake (drum brake)
Tyres - Front
70/100-17
Specifications are compiled from manufacturer documentation and cross-referenced
technical sources, and corrected on an ongoing basis.
Spot an error? Let us know.
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