Motocross Bikes
2027Yamaha YZ125 Monster Energy
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The 2027 Yamaha YZ125 Monster Energy Edition is Yamaha's 125cc two-stroke motocrosser in Monster Energy Yamaha Racing graphics, with the standard bike's liquid-cooled reed-valve engine, Keihin PWK38S carburetor, 6-speed gearbox and a claimed 212 lb wet weight. US MSRP is $7,399.
- Capacity
- 125.0 ccm
- Engine
- Single, two-stroke
- Gearbox
- 6-speed
- Dry weight
- 86.2 kg
- Seat height
- 980 mm
- Power
- 15.0 HP (11.0 kW)
What’s new for the 2027 Yamaha YZ125 Monster Energy
vs the 2026| Spec | 2026 | 2027 |
|---|---|---|
| Dry weight | — | 86.2 kg (190.0 pounds) |
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
- 15.0 HP (11.0 kW)
- Engine type
- Single, two-stroke
- Power/weight ratio
- 0.1740 HP/kg (dry)
- Bore x stroke
- 54.0 x 54.5 mm
- Compression
- 10.1:1
- Cooling system
- Liquid
- Fuel system
- Carburettor
- Starting
- Kick
- Ignition
- CDI
- Valves per cylinder
- 1
- Lubrication system
- Premix
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
Other
- Comments
- Monster Energy Yamaha Racing edition graphics.
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 | 2022 | 2023 | 2025 | 2026 | 2027 |
|---|---|---|---|---|---|
| Capacity | 125 cc | 125 cc | 125 cc | 125 cc | 125 cc |
| Dry weight | — | — | — | — | 86 kg |
| Seat height | 980 mm | 980 mm | 980 mm | 980 mm | 980 mm |
| Fuel capacity | 6.8 L | 6.8 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 YZ125 Monster Energy?
The 2027 Yamaha YZ125 Monster Energy has a Capacity of 125.0 ccm (7.63 cubic inches).
What engine power does the Yamaha YZ125 Monster Energy have?
The 2027 Yamaha YZ125 Monster Energy has a Power of 15.0 HP (11.0 kW).
How many gears does the Yamaha YZ125 Monster Energy have?
The 2027 Yamaha YZ125 Monster Energy has a Gearbox of 6-speed.
How much does the Yamaha YZ125 Monster Energy weigh?
The 2027 Yamaha YZ125 Monster Energy has a Dry weight of 86.2 kg (190.0 pounds).
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