Motocross Bikes
2015Yamaha YZ125
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The 2015 Yamaha YZ125 is a lightweight two-stroke motocrosser designed for amateur and intermediate off-road riders seeking an agile, responsive machine. Known for its sharp handling and nimble maneuverability, this 125cc class bike excels in tight terrain and serves as an ideal progression platform for developing riders transitioning from smaller displacement models.
- Capacity
- 125.0 ccm
- Engine
- Single, two-stroke
- Gearbox
- 6-speed
- Dry weight
- 86.2 kg
- Seat height
- 975 mm
- Power
- 34.0 HP (25.0 kW)
What’s new for the 2015 Yamaha YZ125
vs the 2014| Spec | 2014 | 2015 |
|---|---|---|
| Power | — | 34.0 HP (25.0 kW) |
| Seat height | 998 mm (39.3 inches) | 975 mm (38.4 inches) |
| Front brakes | Single disc. Hydraulic disc. Hydraulic disc. | Single disc. Hydraulic. |
| Rear brakes | Single disc | Single disc. Hydraulic. |
Other years
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
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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
- Power
- 34.0 HP (25.0 kW)
- Engine type
- Single, two-stroke
- Power/weight ratio
- 0.3944 HP/kg (dry)
- 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
- Premix
Transmission
- Gearbox
- 6-speed
- Transmission type
- Manual
- Final drive
- Chain
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
- 94.8 kg
- Fuel capacity
- 8.00 litres
- Ground clearance
- 366 mm
- Oil capacity
- 0.70 litres
Chassis & suspension
- Frame
- Aluminum
- 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
- Team Yamaha Blue/White
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 2015 Yamaha YZ125 has a Capacity of 125.0 ccm (7.63 cubic inches).
What engine power does the Yamaha YZ125 have?
The 2015 Yamaha YZ125 has a Power of 34.0 HP (25.0 kW).
How many gears does the Yamaha YZ125 have?
The 2015 Yamaha YZ125 has a Gearbox of 6-speed.
How much does the Yamaha YZ125 weigh?
The 2015 Yamaha YZ125 has a Dry weight of 86.2 kg (190.0 pounds).
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