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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. Scroll down for the complete 2021 Honda CRF125F spec sheet covering every technical detail from suspension travel to tyre sizes.
2021 CRF125F - Pros & Cons
Strengths
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🔧
Fuel injection: The fuel injection injection system delivers crisp throttle response and reliable cold starts regardless of altitude or temperature.
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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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ℹ️
Age-related wear: As with any used CRF125F, a thorough pre-purchase inspection covering consumables, service history and tyres is always recommended.
Owner Experiences & Common Issues
Throttle response and fuelling
The fuel injection on the 2021 Honda CRF125F is generally well-regarded. Some owners note a slight hesitation at small throttle openings when cold, which clears once the engine reaches operating temperature. A quick visual check of the injector connectors during routine servicing is good practice on higher-mileage examples.
Valve clearance checks
Single Overhead Cams (SOHC) engines should have valve clearances checked at the manufacturer's specified interval. Owners report that clearances can tighten over time on higher-mileage bikes, leading to slight ticking from the top end. Catching it early keeps the job simple and avoids more costly remediation.
CRF125F - Buying & Maintenance Guide
What to check before buying
When inspecting a used 2021 Honda CRF125F, start with the basics: check the service book for oil change frequency, inspect the chain and sprockets for wear, and look for oil seepage around the engine casings and rocker covers. 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 on any CRF125F. Stick to the manufacturer's interval - typically every 6,000 km or once a year, whichever comes first. 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. This is a job many owners skip because the bike does not immediately feel wrong - but tight clearances accelerate valve seat wear. Ask for proof it has 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 power does the 2021 Honda CRF125F make?
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.
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. 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
Bore x Stroke (in,)
2.1 x 2.3 inches
Bore x Stroke (mm)
52.4 x 57.9 mm
Displacement (cc)
124.9 cc
Displacement (ci)
7.62 cubic inches
Engine Type
Single cylinder, four-stroke
Fuel Control
Single Overhead Cams (SOHC)
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
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