Motocross Bikes
2017Yamaha YZ125X
38 fields on record
The 2017 Yamaha YZ125X is a competition-focused two-stroke dirt bike designed for intermediate to advanced off-road riders seeking lightweight agility and responsive handling. Known for its potent power delivery and nimble chassis, it excels in motocross and cross-country racing environments. The bike features fully adjustable suspension, hydraulic disc brakes, and a proven 125cc engine delivering high performance across varied terrain.
- Capacity
- 124.0 ccm
- Engine
- Single, two-stroke
- Gearbox
- 6-speed
- Wet weight
- 93.5 kg
- Seat height
- 975 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
- 124.0 ccm
- Power
- 15.0 HP (11.0 kW)
- Engine type
- Single, two-stroke
- Power/weight ratio
- 0.1604 HP/kg (wet)
- Bore x stroke
- 54.0 x 54.5 mm
- Compression
- 7.1:1
- 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
- 1443 mm
- Overall length
- 2141 mm
- Overall width
- 825 mm
- Overall height
- 1285 mm
- Seat height
- 975 mm
- Wet weight
- 93.5 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
- Speed-sensitive system inverted fork
- Rear suspension
- Fully adjustable single shock
- 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
- 100/90-18
Other
- Color options
- Blue/White
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 2017 Yamaha YZ125X has a Capacity of 124.0 ccm (7.57 cubic inches).
What engine power does the Yamaha YZ125X have?
The 2017 Yamaha YZ125X has a Power of 15.0 HP (11.0 kW).
How many gears does the Yamaha YZ125X have?
The 2017 Yamaha YZ125X has a Gearbox of 6-speed.
How much does the Yamaha YZ125X weigh?
The 2017 Yamaha YZ125X has a Wet weight of 93.5 kg (206.1 pounds).
Shop this bike
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The 2017 Yamaha YZ125X is a powerful and nimble off-road motorcycle that is perfect for riders looking to tackle rough terrain. Its 125cc two-stroke engine delivers impressive power and acceleration, while its lightweight and agile frame make it easy to handle on tight trails. The YZ125X also features a smooth-shifting 6-speed transmission, high-performance suspension, and durable construction, making it a reliable choice for off-road enthusiasts.
Overall, the 2017 Yamaha YZ125X is a top-notch off-road motorcycle that offers exceptional performance and handling. Whether you're navigating through tight woods or conquering steep hills, this bike is up for the challenge. With its powerful engine, responsive suspension, and lightweight design, the YZ125X is a fantastic choice for anyone looking to push the limits on the trail.
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