Motocross Bikes
2023Yamaha YZ125 Monster Energy
42 fields on record
The 2023 Yamaha YZ125 Monster Energy is a lightweight 125cc two-stroke motocross bike designed for junior riders and beginners entering competitive racing. Known for its responsive power delivery and nimble handling, this machine combines a liquid-cooled reed-valve engine with a six-speed transmission to deliver exciting performance on the track while remaining manageable for less experienced competitors.
- Capacity
- 125.0 ccm
- Engine
- Single, two-stroke
- Gearbox
- 6-speed
- Wet weight
- 94.8 kg
- Seat height
- 980 mm
- Power
- 15.0 HP (11.0 kW)
How it rides
Editorial estimate from the spec sheet - not lab tested- Best for
- Built purely for motocross track riding and competitive off-road racing, not general transportation.
- Built for
- A raw, high-revving two-stroke that rewards aggressive riding, precise clutch control, and active rider input over smooth cruising.
- Not ideal for
- Not suitable for street use, commuting, passengers, or riders seeking comfort and low-maintenance touring 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
- 0.1582 HP/kg (wet)
- Bore x stroke
- 54.0 x 54.5 mm
- Compression
- 10.1:1
- Cooling system
- Liquid
- Fuel system
- Carburettor
- Starting
- Kick
- Ignition
- CDI
- Lubrication system
- Premix
- Spark plugs
- NGK BR9EVX, NGK BR9EIX
Transmission
- Gearbox
- 6-speed
- Transmission type
- Manual
- Final drive
- Chain
- Clutch
- Multiplate wet clutch
Dimensions & weight
- Wheelbase
- 1445 mm
- Overall length
- 2136 mm
- Overall width
- 826 mm
- Overall height
- 1295 mm
- Seat height
- 980 mm
- Wet weight
- 94.8 kg
- Fuel capacity
- 6.80 litres
- Ground clearance
- 366 mm
- Oil capacity
- 0.70 litres
- Dry weight
- Not on record - add it
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
- Fork tube size
- 48 mm
Brakes & wheels
- Front brakes
- Single disc. Hydraulic.
- Front brakes diameter
- 270 mm
- Rear brakes
- Single disc. Hydraulic.
- Front tyre
- 80/100-21
- Rear tyre
- 100/90-19
- Tire pressure front
- 15 PSI (1 Bar or 100 kPa)
- Tire pressure rear
- 15 PSI (1 Bar or 100 kPa)
Other
- Color options
- Team Yamaha Blue/green
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 2023 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 2023 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 2023 Yamaha YZ125 Monster Energy has a Gearbox of 6-speed.
How much does the Yamaha YZ125 Monster Energy weigh?
The 2023 Yamaha YZ125 Monster Energy has a Wet weight of 94.8 kg (209.0 pounds).
Shop this bike
Affiliate linksWe may earn a commission from qualifying eBay or Amazon purchases made through these links. As an Amazon Associate I earn from qualifying purchases.
I recently had the opportunity to test ride the 2023 Yamaha YZ125 Monster Energy edition and I was thoroughly impressed. The powerful 125cc engine provided fantastic acceleration and the responsive handling made taking on tight corners a breeze. The Monster Energy graphics and special edition styling made this bike stand out from the crowd, and I appreciated the attention to detail in the design. Overall, the 2023 Yamaha YZ125 Monster Energy is a top-notch motocross bike that delivers performance and style in one package.
The 2023 Yamaha YZ125 Monster Energy is a game-changer in the motocross world. With its powerful engine, responsive handling, and eye-catching design, this bike has everything a rider could ask for. Whether you're hitting the track or trails, the YZ125 Monster Energy edition is sure to turn heads and deliver thrills. If you're in the market for a high-performance motocross bike with a unique look, the 2023 Yamaha YZ125 Monster Energy is definitely worth considering.
Please log in or register if you'd like to leave a comment.
Own one? Add it to My Garage and write an owner review with an Owner badge.