Motocross Bikes
2027Yamaha YZ125
37 fields on record
The Yamaha YZ125 continues as Yamaha's smallest two-stroke motocross racer for 2027, powered by a 125cc liquid-cooled, reed-valve engine fed by a Keihin PWK38S carburetor through a constant-mesh 6-speed gearbox. At a claimed 212 lb wet weight, it remains a favourite entry point into two-stroke motocross competition for lighter and less experienced racers.
- 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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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
- 10.1:1
- 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
- 1445 mm
- Overall length
- 2135 mm
- Overall width
- 825 mm
- Overall height
- 1295 mm
- Seat height
- 980 mm
- Dry weight
- 86.2 kg
- Wet weight
- 96.2 kg
- Fuel capacity
- 6.80 litres
- Ground clearance
- 365 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
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
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 2027 Yamaha YZ125 has a Capacity of 125.0 ccm (7.63 cubic inches).
How many gears does the Yamaha YZ125 have?
The 2027 Yamaha YZ125 has a Gearbox of 6-speed.
How much does the Yamaha YZ125 weigh?
The 2027 Yamaha YZ125 has a Dry weight of 86.2 kg (190.0 pounds).
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