Specifications
Engine
Chassis
Dimensions
Features
The complete intake system has been updated. The air filter’s intake has been enlarged and reshaped to allow air through more smoothly and the joints have been updated for a smoother connection to the carburetor. All carburetor settings have been optimised for balanced fuel ow at all throttle openings. And ignition timing has been updated for optimal combustion at every degree of throttle opening.
The high-tech 125cc 2-stroke engine is the most powerful unit ever used on the YZ125. Equipped with Yamaha's famous YPVS (Yamaha Power Valve System) that gives instant response and excellent useability across the rpm range and featuring lightweight race-bred internals it's destined to take you to the victorYZone!
The latest generation bodywork is ultra slim with the area between the rider's knees the narrowest it's ever been on a YZ125 and this athletic and modern design underlines the bike's lightness and compactness. These slim dimensions give a high level of rider mobility and reinforce this lightweight racer's feeling of agility.
The YZ125 is equipped with a Keihin PWK 38.1mm carburetor featuring a solenoid controlled powerjet for even more explosive performance giving a real advantage out of the gate and when accelerating hard out of corners. A TPS (Throttle Position Sensor) and 3D map controlled CDI ensure optimised ignition timing while the V-Force reed valve assembly ensures optimum intake efficiency at all engine speeds. The 2026 YZ125 allows riders to adjust carburetor settings with greater ease making the machine even more adaptable and user friendly.
Every second counts, and for reduced lap times the YZ125 runs with a supersmooth shifting 6-speed transmission that enables you to accelerate efficiently and keep ahead of the competition. Transmission ratios have been carefully chosen by Yamaha's engineers to maximize race performance and power output in all conditions.
Engine performance is just one element of being competitive – the ability to handle the power effectively and take total control of the chassis is also vital. A at seat with a low front combined with a slim tank and narrow radiator shrouds make it easy to shift your weight around the bike for increased controllability when braking accelerating and cornering.
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