2012Yamaha YZ125

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The 2012 Yamaha YZ125 is a lightweight 124cc two-stroke motocross bike engineered for amateur and intermediate riders. Known for its responsive reed-valve engine and nimble handling, it excels in competitive racing and training environments. The liquid-cooled single-cylinder delivers punchy power delivery ideal for developing rider skills on various track conditions.

Capacity: 124.0 ccm
Engine: Single, two-stroke
Gearbox: 6-speed
Dry weight: 86.2 kg
Seat height: 998 mm
Power: Not on record
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What’s new for the 2012 Yamaha YZ125

vs the 2011

Spec	2011	2012
Front brakes	Single disc. Wave	Single disc. Hydraulic
Rear brakes	Single disc. Wave	Single disc. Hydraulic

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 998mm, a rider of 68.9" with a 31" (estimated) inseam will not reach the ground comfortably on the 2012 Yamaha YZ125, with a moderate knee angle of around 90 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.

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Full specifications

Engine

Capacity: 124.0 ccm
Engine type: Single, two-stroke
Bore x stroke: 54.0 x 54.5 mm
Compression: 8.6:1
Cooling system: Liquid
Fuel system: Carburettor
Starting: Electric
Ignition: CDI
Lubrication system: Wet sump
Power: Not on record - add it

Transmission

Gearbox: 6-speed
Transmission type: Manual
Final drive: Chain
Clutch: Multiplate, wet

Dimensions & weight

Wheelbase: 1443 mm
Overall length: 2136 mm
Overall width: 828 mm
Overall height: 1316 mm
Seat height: 998 mm
Dry weight: 86.2 kg
Wet weight: 94.4 kg
Fuel capacity: 8.00 litres
Ground clearance: 386 mm
Oil capacity: 0.70 litres

Chassis & suspension

Front suspension: Speed-sensitive system inverted fork
Rear suspension: Fully adjustable single shock
Front wheel travel: 300 mm
Rear wheel travel: 315 mm
Rake (fork angle): 28.0°
Trail: 109 mm

Brakes & wheels

Front brakes: Single disc. Hydraulic
Front brakes diameter: 250 mm
Rear brakes: Single disc. Hydraulic
Rear brakes diameter: 245 mm
Front tyre: 80/100-21
Rear tyre: 100/90-19

Other

Color options: Blue/White

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	2012	2015	2021	2027
Capacity	124 cc	124 cc	124 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	998 mm	975 mm	975 mm	980 mm
Fuel capacity	7.9 L	7.9 L	8 L	8 L	8 L	6.8 L