Motocross Bikes
2026Yamaha YZ125X
37 fields on record
The 2026 Yamaha YZ125X is a lightweight 125cc 2-stroke motocross bike designed for amateur and intermediate riders seeking competitive performance on the track. Known for its responsive handling, aggressive power delivery, and nimble chassis, it excels in tight technical sections while remaining manageable for developing riders advancing their racing skills.
- Capacity
- 125.0 ccm
- Engine
- Single, two-stroke
- Gearbox
- 6-speed
- Wet weight
- 96.2 kg
- Seat height
- 970 mm
- Power
- 15.0 HP (11.0 kW)
How it rides
Editorial estimate from the spec sheet - not lab tested- Best for
- Built as a cross-country/off-road competition machine, essentially a trail-tuned YZ125 motocrosser with wider-ratio gearing and off-road suspension settings.
- Built for
- Raw, high-strung, and reward-driven, this bike delivers sharp, punchy 2-stroke power and razor-sharp agility for riders who like to work the bike hard.
- Not ideal for
- Not for riders seeking comfort, highway capability, passenger accommodation, or a low-maintenance, easy-going ride.
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
- 15.0 HP (11.0 kW)
- Engine type
- Single, two-stroke
- Power/weight ratio
- 0.1559 HP/kg (wet)
- Bore x stroke
- 54.0 x 54.5 mm
- Compression
- 10.2:1
- Cooling system
- Liquid
- Fuel system
- Carburettor
- Starting
- Kick
- Ignition
- CDI
- Lubrication system
- Premix
Transmission
- Gearbox
- 6-speed
- Transmission type
- Manual
- Final drive
- Chain
Dimensions & weight
- Wheelbase
- 1455 mm
- Overall length
- 2154 mm
- Overall width
- 825 mm
- Overall height
- 1290 mm
- Seat height
- 970 mm
- Wet weight
- 96.2 kg
- Fuel capacity
- 6.80 litres
- Ground clearance
- 356 mm
- Oil capacity
- 0.70 litres
- Dry weight
- Not on record - add it
Chassis & suspension
- Frame
- Semi-double cradle aluminium
- 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)
- 26.4°
- Trail
- 112 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
- 90/90-21
- Rear tyre
- 110/90-18
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 | 2017 | 2020 | 2022 | 2025 | 2026 | 2027 |
|---|---|---|---|---|---|---|
| Capacity | 124 cc | 125 cc | 125 cc | 125 cc | 125 cc | 125 cc |
| Seat height | 975 mm | 975 mm | 975 mm | 970 mm | 970 mm | 970 mm |
| Fuel capacity | 8 L | 8 L | 8 L | 6.8 L | 6.8 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 YZ125X?
The 2026 Yamaha YZ125X has a Capacity of 125.0 ccm (7.63 cubic inches).
What engine power does the Yamaha YZ125X have?
The 2026 Yamaha YZ125X has a Power of 15.0 HP (11.0 kW).
How many gears does the Yamaha YZ125X have?
The 2026 Yamaha YZ125X has a Gearbox of 6-speed.
How much does the Yamaha YZ125X weigh?
The 2026 Yamaha YZ125X has a Wet weight of 96.2 kg (212.1 pounds).
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