Motocross Bikes
2021Yamaha YZ125
38 fields on record
The 2021 Yamaha YZ125 is a lightweight two-stroke motocross bike designed for young riders and those new to competitive off-road racing. Powered by a liquid-cooled 125cc single-cylinder engine with a Mikuni carburetor, it delivers nimble handling and responsive performance ideal for learning technique on the track. Known for its affordable entry price and reliable Yamaha engineering, the YZ125 remains a popular choice in the 125cc motocross class.
- Capacity
- 125.0 ccm
- Engine
- Single, two-stroke
- Gearbox
- 6-speed
- Dry weight
- 86.2 kg
- Seat height
- 975 mm
- Power
- Not on record
Know it? Add it →
Other years
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
How it rides
Editorial estimate from the spec sheet - not lab tested- Best for
- Built purely for motocross racing and aggressive trail riding, not for commuting, road use, or casual leisure riding.
- Built for
- A raw, high-revving 2-stroke racer that rewards precise clutch and throttle control with explosive acceleration and razor-sharp handling on dirt.
- Not ideal for
- Not for beginners, road riders, passengers, or anyone wanting comfort, storage, or long-distance capability.
Scores are derived from the spec sheet using the same model across every bike, so they compare like for like.
Will it fit you?
Worked out in your browser - nothing is sent to usEngine
- Capacity
- 125.0 ccm
- Engine type
- Single, two-stroke
- Bore x stroke
- 54.0 x 54.5 mm
- Compression
- 10.7:1
- Cooling system
- Liquid
- Fuel system
- Carburettor
- Starting
- Kick
- Ignition
- CDI
- Lubrication system
- Premix
- Power
- Not on record - add it
Transmission
- Gearbox
- 6-speed
- Transmission type
- Manual
- Final drive
- Chain
- Clutch
- Multiplate wet clutch
Dimensions & weight
- Wheelbase
- 1443 mm
- Overall length
- 2136 mm
- Overall width
- 828 mm
- Overall height
- 1295 mm
- Seat height
- 975 mm
- Dry weight
- 86.2 kg
- Wet weight
- 93.9 kg
- Fuel capacity
- 8.00 litres
- Ground clearance
- 366 mm
- Oil capacity
- 0.70 litres
Chassis & suspension
- Frame
- Semi-double cradle aluminium frame
- Front suspension
- KYB® Speed-Sensitive System inverted fork; fully adjustable
- Rear suspension
- KYB® single shock; fully adjustable
- Front wheel travel
- 300 mm
- Rear wheel travel
- 315 mm
- Rake (fork angle)
- 26.0°
- Trail
- 109 mm
Brakes & wheels
- Front brakes
- Single disc. Hydraulic.
- Front brakes diameter
- 270 mm
- Rear brakes
- Single disc. Hydraulic.
- Rear brakes diameter
- 245 mm
- Front tyre
- 80/100-21
- Rear tyre
- 100/90-19
Other
- Color options
- Team Yamaha Blue
Specs last verified against published sources: .
Compiled from manufacturer documentation and user contributions, corrected on an ongoing basis. Spotted something wrong? Tell us.
What changed, year to year
Differences highlighted| Specification | 2002 | 2008 | 2015 | 2021 | 2027 |
|---|---|---|---|---|---|
| Capacity | 124 cc | 124 cc | 125 cc | 125 cc | 125 cc |
| Dry weight | 88 kg | 86 kg | 86 kg | 86 kg | 86 kg |
| Seat height | 994 mm | 998 mm | 975 mm | 975 mm | 980 mm |
| Fuel capacity | 7.9 L | 7.9 L | 8 L | 8 L | 6.8 L |
Illustrative - generated automatically by diffing the year records already on file, not a manufacturer-published changelog.
Rider Reviews
Common questions
What is the engine size of the Yamaha YZ125?
The 2021 Yamaha YZ125 has a Capacity of 125.0 ccm (7.63 cubic inches).
How many gears does the Yamaha YZ125 have?
The 2021 Yamaha YZ125 has a Gearbox of 6-speed.
How much does the Yamaha YZ125 weigh?
The 2021 Yamaha YZ125 has a Dry weight of 86.2 kg (190.0 pounds).
Shop this bike
Affiliate linksWe may earn a commission from qualifying eBay or Amazon purchases made through these links. As an Amazon Associate I earn from qualifying purchases.
The 2021 Yamaha YZ125 is a powerful and agile motocross bike that delivers top-notch performance on the track. With its 125cc two-stroke engine, this bike offers excellent power and acceleration, making it a top choice for riders looking for a competitive edge. The YZ125's lightweight chassis and responsive handling make it easy to maneuver through tight corners and tackle challenging obstacles with confidence. Additionally, the bike's suspension and braking systems provide a smooth and controlled ride, allowing riders to push their limits without compromise. Overall, the 2021 Yamaha YZ125 is a fantastic choice for motocross enthusiasts who want a high-performance bike that delivers on the track.
In conclusion, the 2021 Yamaha YZ125 is a standout motocross bike that provides impressive power, agility, and handling. Whether you're a seasoned racer or a beginner looking to improve your skills, this bike has everything you need to take your riding to the next level. With its exceptional performance and top-notch features, the YZ125 is a top contender in its class and is sure to impress riders of all skill levels.
Please log in or register if you'd like to leave a comment.
Own one? Add it to My Garage and write an owner review with an Owner badge.