Yamaha has been building 2-stroke motocross bikes for the past 50 years – and has been an equally long racing history. It is this unrivalled experience that has enabled the company to develop the latest 2025 YZ125 – a bike that is built to take you into the victorYZone!
Key Specifications
Engine Type
Liquid-cooled, 2-stroke, Single cylinder, reed-valve inducted
Engine Capacity
125 cc / 7.62 cubic inches
Max Power
n/a
Max Torque
n/a
Top Speed
n/a
Fuel Tank Capacity
7 L / 1.84 US gallons
Weight (Wet/Kerb)
96 kg / 212 lbs
Seat Height
980 mm / 38.5 inches
*n/a – information not provided by manufacturer
All Specifications
Make & Model
Model
Yamaha YZ125
Year
2026
Engine
Engine Type
Liquid-cooled, 2-stroke, Single cylinder, reed-valve inducted
Displacement
125 cc / 7.62 cubic inches
Bore x Stroke
54 x 54.5 mm
Compression Ratio
8.2~10.1:1
Number of Cylinders
1
Max Horsepower
n/a
Max Torque
n/a
Engine Management System
Hitachi Astemo® Keihin PWK38S carburetor
Lubrication System
Premix
Cooling System
Liquid-cooled
Ignition System
CDI, Kick
Performance
Top Speed
n/a
*n/a – information not provided by manufacturer
Transmission
Clutch
Wet multiplate clutch, hydraulic
Gearbox
Constant-mesh 5-speed
Final Drive
Chain
Electrical & Electronics System
Headlight Type
n/a
Chassis & Suspension
Frame Type
Semi double cradle
Front Suspension
KYB® Speed-Sensitive System inverted fork; fully adjustable
Front Suspension Travel
300 mm / 11.8 inches
Rear Suspension
KYB® single shock; fully adjustable
Rear Suspension Travel
315 mm / 12.4 inches
Rake
26 °
Trail
109 mm / 4.3 inches
Rear Subframe
Removable Aluminum subframe
Wheels & Brakes
Wheels
Wire aluminum wheels
Front Tire Size
80/100-21 Bridgestone® Battlecross X20F
Rear Tire Size
100/90-19 Bridgestone® Battlecross X20
Front Brakes
Hydraulic disc, 270mm
Rear Brakes
Hydraulic disc, 240mm
Dimension & Weights
Overall Length
2135 mm / 84 inches
Overall Width
825 mm / 32.5 inches
Overall Height
1295 mm / 51 inches
Seat Height
980 mm / 38.5 inches
Wheelbase
1445 mm / 57 inches
Ground Clearance
365 mm / 14.4 inches
Fuel Tank Capacity
7 L / 1.84 US gallons
Wet (kerb/curb) Weight
96 kg / 212 lbs
Features
Updated CDI settings optimize combustion for more linear power delivery and enhanced rideability.
Updated air intake and intake boot design yield a more seamless connection and smoother airflow.
Revised carburetor setting for more consistent performance in varied conditions.
Yamaha’s advanced, liquid-cooled 125cc two-stroke engine provides impressive power and supreme usability.
Patented Yamaha Power Valve System combines crisp bottom-end torque with potent mid-range and free-revving top-end.
High-precision Hitachi Astemo® Keihin PWK38S carburetor provides clean, crisp throttle response and superior rideability.
Digital CDI system delivers precise spark and monitors engine speed to ensure optimal timing for faster, stronger response.
Close-ratio six-speed transmission has wider gear tooth width and optimized gear ratios for maximum performance.
High-capacity radiator with dark louvers deliver maximum cooling efficiency and an aggressive look.
Lightweight finely tuned chassis means nimble handling, more control and less rider fatigue.
High performance braking system features a 270mm front and 240mm rear rotors offering exceptional braking power and feel.
Fully adjustable KYB® shock provides exceptional rear wheel control and class-leading capability.
Best-in-class Speed Sensitive 48mm KYB® fork includes a leaf spring in the mid-speed valve for unmatched performance.
Removable aluminum rear subframe is constructed of square-section tubing for reduced weight.
Race-proven aluminum semi-double cradle frame is engineered to provide the perfect balance of strength and flex.
Carefully considered ergonomic design includes a flat seat and slim, integrated body panels for greater freedom of movement.
Competition-ready features include two-position adjustable handlebar, wide foot pegs, and works-style cable adjuster.
Premium Yamaha graphics are embedded to provide excellent durability and scratch resistance.
Yamaha YZ125 (2025) Color Options
Icon Blue (Europe)
Team Yamaha Blue (US)
*We strive to provide the most comprehensive and accurate specifications possible. However, certain details may not be available if the manufacturer did not disclose them or if the information is no longer publicly accessible. If you find any discrepancy with any data on this site, please feel free to let us know at contact@throttlecraze.com
