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Motocross Bikes

2020Yamaha YZ125

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The 2020 Yamaha YZ125 is a lightweight two-stroke motocross bike engineered for younger riders and beginners entering competitive off-road racing. Powered by a liquid-cooled 125cc reed-valve engine with aggressive power delivery, it delivers sharp acceleration and nimble handling across varied terrain. Known for its reliability and affordable entry point into the YZ lineup, the YZ125 remains a popular choice for amateur motocross competition.

Capacity: 125.0 ccm
Engine: Single, two-stroke
Gearbox: 6-speed
Dry weight: 86.2 kg
Seat height: 975 mm
Power: Not on record
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What’s new for the 2020 Yamaha YZ125

vs the 2019

Spec	2019	2020
Power	33.5 HP (24.5 kW)	not listed
Top speed	96.0 km/h (59.7 mph)	not listed

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

Off-road & trail97%

Cornering90%

City riding5%

Daily riding5%

Touring5%

Two-up0%

Track85%

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?

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Your height

Inseam (optional)

Units

At 975mm, a rider of 175cm with a 79cm (estimated) inseam will not reach the ground comfortably on the 2020 Yamaha YZ125, with a cramped knee angle of around 85 degrees and an upright riding position.

Assumes about 30mm of suspension sag once seated. This is an approximation from category-typical geometry, not a measurement of this bike or of you - sit on one before you buy.

More bikes at over 900 mm — Sky High →

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Full specifications

Engine

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: October 2026.

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	2020	2021	2027
Capacity	124 cc	124 cc	125 cc	125 cc	125 cc	125 cc
Dry weight	88 kg	86 kg	86 kg	86 kg	86 kg	86 kg
Seat height	994 mm	998 mm	975 mm	975 mm	975 mm	980 mm
Fuel capacity	7.9 L	7.9 L	8 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

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MotorcycleDB

The 2020 Yamaha YZ125 is a powerful and agile motocross bike that is perfect for riders of all skill levels. With its lightweight frame and responsive handling, the YZ125 offers a thrilling riding experience both on the track and in the trails. The 125cc 2-stroke engine delivers impressive power and torque, allowing riders to tackle challenging terrain with confidence. Additionally, the YZ125 features a comfortable and ergonomic design that provides excellent control and maneuverability, making it a top choice for riders looking for a competitive edge.

Overall, the 2020 Yamaha YZ125 is a top-notch motocross bike that offers a winning combination of power, performance, and agility. Whether you're a seasoned rider or just starting out, the YZ125 is sure to impress with its impressive capabilities on the track and in the trails. With its responsive handling and powerful engine, this bike is a must-have for any motocross enthusiast looking for a high-performance ride.

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