Motocross Bikes

2025Yamaha YZ125

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The 2025 Yamaha YZ125 is a lightweight two-stroke motocross machine designed for beginner to intermediate riders seeking an affordable entry into competitive racing. Known for its punchy 125cc engine and nimble handling, this bike excels in amateur racing and recreational trail riding with excellent power delivery and easy maintenance.

Capacity: 125.0 ccm
Engine: Single, two-stroke
Gearbox: 6-speed
Dry weight: 86.2 kg
Seat height: 980 mm
Power: Not on record
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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 980mm, a rider of 68.9" with a 31" (estimated) inseam will not reach the ground comfortably on the 2025 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: 10.1:1
Cooling system: Liquid
Fuel system: Carburettor
Starting: Kick
Ignition: CDI
Lubrication system: Premix
Spark plugs: NGK BR9EVX, NGK BR9EIX
Power: Not on record - add it

Transmission

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

Dimensions & weight

Wheelbase: 1445 mm
Overall length: 2136 mm
Overall width: 826 mm
Overall height: 1295 mm
Seat height: 980 mm
Dry weight: 86.2 kg
Wet weight: 94.8 kg
Fuel capacity: 6.80 litres
Ground clearance: 366 mm
Oil capacity: 0.70 litres

Chassis & suspension

Frame: Aluminum semi-double cradle
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
Fork tube size: 48 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
Brake fluid: DOT 4
Tire pressure front: 15 PSI (1 Bar or 100 kPa)
Tire pressure rear: 15 PSI (1 Bar or 100 kPa)

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	2021	2025	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	980 mm	980 mm
Fuel capacity	7.9 L	7.9 L	8 L	8 L	6.8 L	6.8 L