Motocross Bikes
2020Yamaha YZ125X
38 fields on record
The 2020 Yamaha YZ125X is a lightweight two-stroke enduro bike designed for beginning and intermediate off-road riders seeking affordable trail performance. Its responsive 125cc reed-valve engine delivers snappy power delivery ideal for learning techniques, while the compact chassis ensures easy handling on technical terrain. Known for reliability and low maintenance costs, it remains a popular choice for riders transitioning into competitive enduro racing.
- Capacity
- 125.0 ccm
- Engine
- Single, two-stroke
- Gearbox
- 6-speed
- Wet weight
- 94.8 kg
- Seat height
- 975 mm
- Power
- 15.0 HP (11.0 kW)
What’s new for the 2020 Yamaha YZ125X
vs the 2019| Spec | 2019 | 2020 |
|---|---|---|
| Wet weight | 93.5 kg (206.1 pounds) | 94.8 kg (209.0 pounds) |
| Front suspension | Speed-sensitive system inverted fork | KYB® Speed-Sensitive System inverted fork; fully adjustable |
| Rear suspension | Fully adjustable single shock | KYB® single shock; fully adjustable |
| Compression | 7.1:1 | 8.8:1 |
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
- 0.1582 HP/kg (wet)
- Bore x stroke
- 54.0 x 54.5 mm
- Compression
- 8.8:1
- 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
- 2141 mm
- Overall width
- 825 mm
- Overall height
- 1285 mm
- Seat height
- 975 mm
- Wet weight
- 94.8 kg
- Fuel capacity
- 8.00 litres
- Ground clearance
- 351 mm
- Oil capacity
- 0.70 litres
- Dry weight
- Not on record - add it
Chassis & suspension
- Frame
- Semi-double cradle aluminium frame
- 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)
- 26.8°
- Trail
- 117 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
Other
- Color options
- Yamaha Blue
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 | 2027 |
|---|---|---|---|---|---|
| Capacity | 124 cc | 125 cc | 125 cc | 125 cc | 125 cc |
| Seat height | 975 mm | 975 mm | 975 mm | 970 mm | 970 mm |
| Fuel capacity | 8 L | 8 L | 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 2020 Yamaha YZ125X has a Capacity of 125.0 ccm (7.63 cubic inches).
What engine power does the Yamaha YZ125X have?
The 2020 Yamaha YZ125X has a Power of 15.0 HP (11.0 kW).
How many gears does the Yamaha YZ125X have?
The 2020 Yamaha YZ125X has a Gearbox of 6-speed.
How much does the Yamaha YZ125X weigh?
The 2020 Yamaha YZ125X has a Wet weight of 94.8 kg (209.0 pounds).
Shop this bike
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The 2020 Yamaha YZ125X is a top-notch off-road motorcycle that delivers powerful performance and superior handling. With its 125cc two-stroke engine, this bike offers excellent acceleration and responsiveness, making it well-suited for challenging trails and tight corners. The lightweight chassis and nimble handling make it a breeze to maneuver, while the advanced suspension system ensures a smooth and controlled ride over rough terrain. Riders will also appreciate the comfortable ergonomics and durable construction that make the YZ125X a reliable choice for off-road adventures.
For off-road enthusiasts looking for a high-performance and agile motorcycle, the 2020 Yamaha YZ125X is a top contender. Its powerful 125cc two-stroke engine and lightweight chassis provide excellent acceleration and nimble handling, making it a standout choice for tackling challenging trails and tight corners. With advanced suspension and durable construction, this bike offers a smooth and controlled ride over rough terrain, while its comfortable ergonomics make it a reliable option for off-road adventures. Overall, the YZ125X is a top-notch off-road motorcycle that delivers superior performance and handling for riders who crave excitement on the trail.
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