2021 Yamaha YZ125 Motocross Motorcycle

Modern Styling
Modern, aggressive styling, including front fender, front number plate, radiator shrouds, side number plates, air box, rear fender, fork guards, as well as the rear brake disc protector, rear brake caliper protector and wider foot pegs—just like the 4-strokes.

Lightweight Frame
A light aluminium frame housing a patented YPVS™-equipped ripper of an engine results in an awesome power-to-weight ratio.

Race-Ready Features
The YZ125 is ready to race out of the crate, complete with an aluminum handlebar, titanium foot pegs and gripper seat.

Ideal Balance
A pure motocross machine, the light and nimble YZ125 is the perfect choice for riders stepping up from the 85cc class.

Rider-Friendly Chassis
Ultra light weight means nimble handling with less fatigue.

270mm Front Brake
Large 270mm front disc brake coupled with high-performance pad material offers outstanding machine control and performance, with exceptional stopping power and controllability.

Two-Stroke Power
Amazingly compact 124cc reed-valve-inducted two-stroke helps produce an awesome power-to-weight ratio.

Race-Developed Intake
Reed-valve spacer improves acceleration across the entire powerband.

Yamaha Power Valve System
Patented YPVS™ combines crisp, hard-hitting bottom-end acceleration with strong midrange and eye-opening top-end.

Close-Ratio Transmission
Six-speed, close-ratio transmission optimizes gear ratios for maximum performance.

Digital Ignition
Digital CDI system delivers precise spark and monitors engine speed to ensure optimal timing for faster, stronger response during hard acceleration.

High-Capacity Radiator
Large-capacity radiator features a 10-row core with four louvers to deliver maximum cooling efficiency at all performance levels.

Aluminium Frame
A carefully engineered, advanced aluminum frame and swingarm give the YZ125 the best handling in its class.

Lightweight Subframe
Removable aluminum rear subframe is constructed of square-section tubing for reduced weight.

Industry-Leading Fork
Speed-Sensitive System 48mm KYB® fork; damping force is controlled by piston speed which provides a smoother, more precise ride with 11.8 inches of travel.

Race-Ready Tires
Premium Dunlop® knobbies offer race-spec traction and wear.

Bore x Stroke

54.0mm x 54.5mm

Compression Ratio

8.6~10.7:1

Fuel Delivery

Mikuni® TMX 38

KYB® Speed-Sensitive System inverted fork; fully adjustable, 11.8-in travel

Suspension / Rear

KYB® single shock; fully adjustable, 12.4-in travel

Brakes / Front

Hydraulic disc, 270mm

Brakes / Rear

Hydraulic disc, 245mm