Engineered specifically for Yamaha’s iconic YZ125 motocross and YZ125X enduro models, this 25 mm stainless steel exhaust expansion chamber merges top-end power delivery with exceptional durability. Crafted from high-grade stainless steel, this system offers vastly superior resistance to rust and oxidation compared to stock units.
Designed to maximize the explosive power delivery characteristic of 2-stroke engines, its precision-bent geometry sharpens throttle response and lets the motor breathe far more freely in the higher RPM range. It provides the essential lightweight agility needed for track riding and technical off-road sections, while its reinforced structure withstands heavy impacts for long-lasting durability. It offers 100% direct fitment across an extensive model range from 2005 to 2022.
 
Fitment List (2-Stroke / 2T Models):
Yamaha YZ125: 2005–2021 (and 2022+ transition models)
Yamaha YZ125X: 2020–2022
 
Key Features:
Material: High-strength stainless steel construction.
 
Technical Spec: 25 mm inlet diameter with an optimized expansion chamber design.
 
Performance: Enhanced top-end horsepower and an aggressive 2-stroke exhaust note.